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using FastMember;
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using OfficeOpenXml.FormulaParsing.Excel.Functions.Text;
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using Org.BouncyCastle.Asn1.X509.Qualified;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Reflection.Metadata;
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using VOL.Core.BaseProvider;
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using VOL.Core.Enums;
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using VOL.Core.ManageUser;
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using VOL.Entity.DomainModels;
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namespace VOL.Core.Extensions
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{
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public static class LambdaExtensions
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{
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/// <summary>
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/// 分页查询
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="queryable"></param>
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/// <param name="page"></param>
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/// <param name="size"></param>
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/// <returns></returns>
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public static IQueryable<T> TakePage<T>(this IQueryable<T> queryable, int page, int size = 15)
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{
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return queryable.TakeOrderByPage<T>(page, size);
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}
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/// <summary>
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/// 数据过滤拓展
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="queryable"></param>
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/// <returns></returns>
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public static IQueryable<T> DataFilterExtension<T>(this IQueryable<T> queryable)
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{
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Expression<Func<T, bool>> expression = True<T>();
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var parameter = Expression.Parameter(typeof(T), "p");
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// MethodInfo method = typeof(string).GetMethod("Contains", new[] { typeof(string) });
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Type type = typeof(T);
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// if (UserContext.Current.UserInfo.LimitInCompany)
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// {
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// if (type.GetProperty("CORPID") == null)
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// {
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// return null;
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// }
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// else
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// {
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// expression = expression.And(Expression.Lambda<Func<T, bool>>(Expression.Equal(Expression.Constant("CORPID"), Expression.Constant(UserContext.Current.UserInfo.CompanyId)), parameter));
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// }
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// }
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// //如果该用户角色受仓库权限限制 ，则必须
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// if (UserContext.Current.UserInfo.LimitBySTORAGE)
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// {
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// if (type.GetProperty("STOREHOUSE") == null)
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// {
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// return null;
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// }
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// else
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// {
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// Expression<Func<T, bool>> orexpression = False<T>();
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//
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// if (UserContext.Current.UserInfo.STOREHOUSEList.Count > 0)
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// {
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// foreach (var item in UserContext.Current.UserInfo.STOREHOUSEList)
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// {
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// orexpression = orexpression.Or(Expression.Lambda<Func<T, bool>>(Expression.Equal(Expression.Constant("STOREHOUSE"), Expression.Constant(item)), parameter));
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// }
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// expression = expression.And(orexpression);
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// }
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// }
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// }
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//expression = expression.And(Expression.Lambda<Func<T, bool>>(Expression.Equal(Expression.Constant("CORPID"), Expression.Constant(UserContext.Current.UserInfo.CompanyId)), parameter));
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//Expression<Func<T, bool>> orexpression = False<T>();
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//orexpression = orexpression.Or(Expression.Lambda<Func<T, bool>>(Expression.Equal(Expression.Constant("STOREHOUSE"), Expression.Constant(UserContext.Current.UserInfo.CompanyId)), parameter));
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foreach (var item in UserContext.Current.UserInfo.STOREHOUSEList)
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{
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expression = Expression.Lambda<Func<T, bool>>(Expression.Equal(Expression.Constant("STOREHOUSE"), Expression.Constant(item)), parameter);
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}
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// expression = expression.And(orexpression);
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//
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queryable = queryable.Where(expression);
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return queryable;
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}
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/// <summary>
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/// 数据过滤
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="queryable"></param>
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/// <returns></returns>
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public static List<QueryCollection> DataFilter<T>(this IQueryable<T> queryable)
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{
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Type type = typeof(T);
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List<QueryCollection> queryList = new List<QueryCollection>();
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QueryCollection queries1 = new QueryCollection();
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if (UserContext.Current.UserInfo.LimitInCompany)
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{
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if (type.GetProperty("CORPID") == null)
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{
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//return null;
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}
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else {
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queries1.Add(new Query { Name = "CORPID", Operator = Query.Operators.Equal, Value = UserContext.Current.UserInfo.CompanyId });
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//queryList.Add(queries1);
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}
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}
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QueryCollection queries2 = new QueryCollection();
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//如果该用户角色受仓库权限限制 ，则必须
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if (UserContext.Current.UserInfo.LimitBySTORAGE)
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{
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if (type.GetProperty("STOREHOUSE") == null)
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{
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//return null;
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}
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else
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{
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// queries.Add(new Query { Name = "STOREHOUSE", Operator = Query.Operators.Contains, Value = UserContext.Current.UserInfo.STOREHOUSEList });
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if (UserContext.Current.UserInfo.STOREHOUSEList.Count > 0)
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{
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foreach (var item in UserContext.Current.UserInfo.STOREHOUSEList)
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{
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queries2.Add(new Query { Name = "STOREHOUSE", Operator = Query.Operators.Equal, Value =item });
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}
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//queryList.Add(queries2);
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}
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}
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}
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//if (queries.Count == 0)
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//{
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// queries.Add(new Query { Name = "GID", Operator = Query.Operators.NotEqual, Value =Guid.Parse("00000000-0000-0000-0000-000000000000") } );
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//}
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QueryCollection queries3 = new QueryCollection();
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if (UserContext.Current.UserInfo.LimitByUser)
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{
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if (type.GetProperty("SALE") == null && type.GetProperty("OP") == null)
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{
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//return null;
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}
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else
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{
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if (type.GetProperty("SALE") != null)
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queries3.Add(new Query { Name = "SALE", Operator = Query.Operators.Equal, Value = UserContext.Current.UserInfo.User_Id });
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if (type.GetProperty("OP") != null)
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queries3.Add(new Query { Name = "OP", Operator = Query.Operators.Equal, Value = UserContext.Current.UserInfo.User_Id });
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if (type.GetProperty("CreateID") != null)
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queries3.Add(new Query { Name = "CreateID", Operator = Query.Operators.Equal, Value = UserContext.Current.UserInfo.User_Id.ToString() });
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//queryList.Add(queries3);
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}
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}
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queryList.Add(queries1);
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queryList.Add(queries2);
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queryList.Add(queries3);
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return queryList;
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}
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//public static void DoDataFilter( IQueryable<T> queryable )
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//{
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// Expression<Func<T, bool>> expression = True<T>();
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// Type type = typeof(T);
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// QueryCollection queries1 = new QueryCollection();
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// if (UserContext.Current.UserInfo.LimitInCompany)
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// {
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// if (type.GetProperty("CORPID") == null)
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// {
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// return ;
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// }
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// else
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// {
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// queries1.Add(new Query { Name = "CORPID", Operator = Query.Operators.Equal, Value = UserContext.Current.UserInfo.CompanyId });
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// //queryList.Add(queries1);
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// queryable = queryable.Where(queries1.AsExpression<T>(Query.Condition.AndAlso));
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// }
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// }
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// QueryCollection queries2 = new QueryCollection();
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// //如果该用户角色受仓库权限限制 ，则必须
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// if (UserContext.Current.UserInfo.LimitBySTORAGE)
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// {
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// if (type.GetProperty("STOREHOUSE") == null)
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// {
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// return ;
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// }
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// else
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// {
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// // queries.Add(new Query { Name = "STOREHOUSE", Operator = Query.Operators.Contains, Value = UserContext.Current.UserInfo.STOREHOUSEList });
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// if (UserContext.Current.UserInfo.STOREHOUSEList.Count > 0)
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// {
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// foreach (var item in UserContext.Current.UserInfo.STOREHOUSEList)
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// {
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// queries2.Add(new Query { Name = "STOREHOUSE", Operator = Query.Operators.Equal, Value = item });
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// }
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// //queryList.Add(queries2);
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// queryable = queryable.Where(queries2.AsExpression<T>(Query.Condition.OrElse));
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// }
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// }
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// }
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// //if (queries.Count == 0)
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// //{
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// // queries.Add(new Query { Name = "GID", Operator = Query.Operators.NotEqual, Value =Guid.Parse("00000000-0000-0000-0000-000000000000") } );
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// //}
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// //queryList.Add(queries1);
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// //queryList.Add(queries2);
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// QueryCollection queries3 = new QueryCollection();
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// if (UserContext.Current.UserInfo.LimitByUser)
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// {
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// if (type.GetProperty("SALE") == null|| type.GetProperty("OP") == null)
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// {
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// return ;
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// }
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// else
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// {
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// if (type.GetProperty("SALE") != null)
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// queries3.Add(new Query { Name = "SALE", Operator = Query.Operators.Equal, Value = UserContext.Current.UserInfo.User_Id });
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// if (type.GetProperty("OP") != null)
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// queries3.Add(new Query { Name = "OP", Operator = Query.Operators.Equal, Value = UserContext.Current.UserInfo.User_Id });
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// queryable = queryable.Where(queries3.AsExpression<T>(Query.Condition.OrElse));
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// }
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// }
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// return ;
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//}
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/// <summary>
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/// 分页查询
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="queryable"></param>
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/// <param name="page"></param>
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/// <param name="size"></param>
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/// <param name="orderBy"></param>
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/// <returns></returns>
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public static IQueryable<T> TakeOrderByPage<T>(this IQueryable<T> queryable, int page, int size = 15, Expression<Func<T, Dictionary<object, QueryOrderBy>>> orderBy = null)
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{
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if (page <= 0)
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{
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page = 1;
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}
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return queryable.GetIQueryableOrderBy(orderBy.GetExpressionToDic())
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.Skip((page - 1) * size)
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.Take(size);
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}
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public static IQueryable<T> TakeOrderByPage<T>(this IQueryable<T> queryable, List<OrderField> orderby, int page, int size = 15)
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{
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if (page <= 0)
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{
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page = 1;
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}
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var result = queryable;
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if (orderby != null)
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{
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foreach (var d in orderby) {
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result = result.OrderBy(d.Name, d.Desc);
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}
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}
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return result
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.Skip((page - 1) * size)
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.Take(size);
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}
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/// <summary>
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/// 创建lambda表达式：p=>true
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <returns></returns>
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public static Expression<Func<T, bool>> True<T>()
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{
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return p => true;
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}
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/// <summary>
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/// 创建lambda表达式：p=>false
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <returns></returns>
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public static Expression<Func<T, bool>> False<T>()
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{
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return p => false;
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}
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public static ParameterExpression GetExpressionParameter(this Type type)
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{
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return Expression.Parameter(type, "p");
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}
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/// <summary>
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/// 创建lambda表达式：p=>p.propertyName
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <typeparam name="TKey"></typeparam>
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/// <param name="sort"></param>
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/// <returns></returns>
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public static Expression<Func<T, TKey>> GetExpression<T, TKey>(this string propertyName)
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{
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return propertyName.GetExpression<T, TKey>(typeof(T).GetExpressionParameter());
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}
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/// <summary>
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/// 创建委托有返回值的表达式：p=>p.propertyName
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <typeparam name="TKey"></typeparam>
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/// <param name="sort"></param>
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/// <returns></returns>
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public static Func<T, TKey> GetFun<T, TKey>(this string propertyName)
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{
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return propertyName.GetExpression<T, TKey>(typeof(T).GetExpressionParameter()).Compile();
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}
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/// <summary>
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/// 创建lambda表达式：p=>false
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/// 在已知TKey字段类型时,如动态排序OrderBy(x=>x.ID)会用到此功能,返回的就是x=>x.ID
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/// Expression<Func<Out_Scheduling, DateTime>> expression = x => x.CreateDate;指定了类型
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <returns></returns>
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public static Expression<Func<T, TKey>> GetExpression<T, TKey>(this string propertyName, ParameterExpression parameter)
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{
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if (typeof(TKey).Name == "Object")
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return Expression.Lambda<Func<T, TKey>>(Expression.Convert(Expression.Property(parameter, propertyName), typeof(object)), parameter);
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return Expression.Lambda<Func<T, TKey>>(Expression.Property(parameter, propertyName), parameter);
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}
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/// <summary>
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/// 创建lambda表达式：p=>false
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/// object不能确认字段类型(datetime,int,string),如动态排序OrderBy(x=>x.ID)会用到此功能,返回的就是x=>x.ID
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/// Expression<Func<Out_Scheduling, object>> expression = x => x.CreateDate;任意类型的字段
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <returns></returns>
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public static Expression<Func<T, object>> GetExpression<T>(this string propertyName)
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{
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return propertyName.GetExpression<T, object>(typeof(T).GetExpressionParameter());
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}
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public static Expression<Func<T, object>> GetExpression<T>(this string propertyName, ParameterExpression parameter)
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{
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return Expression.Lambda<Func<T, object>>(Expression.Convert(Expression.Property(parameter, propertyName), typeof(object)), parameter);
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}
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/// <summary>
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///
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="propertyName">字段名</param>
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/// <param name="propertyValue">表达式的值</param>
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/// <param name="expressionType">创建表达式的类型,如:p=>p.propertyName != propertyValue
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/// p=>p.propertyName.Contains(propertyValue)</param>
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/// <returns></returns>
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public static Expression<Func<T, bool>> CreateExpression<T>(this string propertyName, object propertyValue, LinqExpressionType expressionType)
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{
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return propertyName.CreateExpression<T>(propertyValue, null, expressionType);
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}
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/// <summary>
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///
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="propertyName">字段名</param>
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/// <param name="propertyValue">表达式的值</param>
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/// <param name="expressionType">创建表达式的类型,如:p=>p.propertyName != propertyValue
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/// p=>p.propertyName.Contains(propertyValue)</param>
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/// <returns></returns>
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private static Expression<Func<T, bool>> CreateExpression<T>(
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this string propertyName,
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object propertyValue,
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ParameterExpression parameter,
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LinqExpressionType expressionType)
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{
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Type proType = typeof(T).GetProperty(propertyName).PropertyType;
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//创建节点变量如p=>的节点p
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// parameter ??= Expression.Parameter(typeof(T), "p");//创建参数p
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parameter = parameter ?? Expression.Parameter(typeof(T), "p");
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//创建节点的属性p=>p.name 属性name
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MemberExpression memberProperty = Expression.PropertyOrField(parameter, propertyName);
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if (expressionType == LinqExpressionType.In)
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{
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|
|
if (!(propertyValue is System.Collections.IList list) || list.Count == 0) throw new Exception("属性值类型不正确");
|
|
|
|
|
|
bool isStringValue = true;
|
|
|
List<object> objList = new List<object>();
|
|
|
|
|
|
if (proType.ToString() != "System.String")
|
|
|
{
|
|
|
isStringValue = false;
|
|
|
foreach (var value in list)
|
|
|
{
|
|
|
objList.Add(value.ToString().ChangeType(proType));
|
|
|
}
|
|
|
list = objList;
|
|
|
}
|
|
|
|
|
|
if (isStringValue)
|
|
|
{
|
|
|
//string 类型的字段，如果值带有'单引号,EF会默认变成''两个单引号
|
|
|
MethodInfo method = typeof(System.Collections.IList).GetMethod("Contains");
|
|
|
//创建集合常量并设置为常量的值
|
|
|
ConstantExpression constantCollection = Expression.Constant(list);
|
|
|
//创建一个表示调用带参数的方法的：new string[]{"1","a"}.Contains("a");
|
|
|
MethodCallExpression methodCall = Expression.Call(constantCollection, method, memberProperty);
|
|
|
return Expression.Lambda<Func<T, bool>>(methodCall, parameter);
|
|
|
}
|
|
|
//非string字段，按上面方式处理报异常Null TypeMapping in Sql Tree
|
|
|
BinaryExpression body = null;
|
|
|
foreach (var value in list)
|
|
|
{
|
|
|
ConstantExpression constantExpression = Expression.Constant(value);
|
|
|
UnaryExpression unaryExpression = Expression.Convert(memberProperty, constantExpression.Type);
|
|
|
|
|
|
body = body == null
|
|
|
? Expression.Equal(unaryExpression, constantExpression)
|
|
|
: Expression.OrElse(body, Expression.Equal(unaryExpression, constantExpression));
|
|
|
}
|
|
|
return Expression.Lambda<Func<T, bool>>(body, parameter);
|
|
|
}
|
|
|
|
|
|
if (expressionType == LinqExpressionType.StartWith)
|
|
|
{
|
|
|
//if (!(propertyValue is System.Collections.IList list) || list.Count == 0) throw new Exception("属性值类型不正确");
|
|
|
|
|
|
bool isStringValue = true;
|
|
|
List<object> objList = new List<object>();
|
|
|
|
|
|
if (proType.ToString() != "System.String")
|
|
|
{
|
|
|
//isStringValue = false;
|
|
|
//foreach (var value in list)
|
|
|
//{
|
|
|
// objList.Add(value.ToString().ChangeType(proType));
|
|
|
//}
|
|
|
//list = objList;
|
|
|
}
|
|
|
|
|
|
if (isStringValue)
|
|
|
{
|
|
|
//string 类型的字段，如果值带有'单引号,EF会默认变成''两个单引号
|
|
|
MethodInfo method = typeof(System.Collections.IList).GetMethod("StartWith");
|
|
|
//创建集合常量并设置为常量的值
|
|
|
ConstantExpression constantCollection = Expression.Constant(propertyValue);
|
|
|
//创建一个表示调用带参数的方法的：new string[]{"1","a"}.Contains("a");
|
|
|
MethodCallExpression methodCall = Expression.Call(constantCollection, method, memberProperty);
|
|
|
return Expression.Lambda<Func<T, bool>>(methodCall, parameter);
|
|
|
}
|
|
|
//非string字段，按上面方式处理报异常Null TypeMapping in Sql Tree
|
|
|
//BinaryExpression body = null;
|
|
|
//foreach (var value in list)
|
|
|
//{
|
|
|
// ConstantExpression constantExpression = Expression.Constant(value);
|
|
|
// UnaryExpression unaryExpression = Expression.Convert(memberProperty, constantExpression.Type);
|
|
|
|
|
|
// body = body == null
|
|
|
// ? Expression.Equal(unaryExpression, constantExpression)
|
|
|
// : Expression.OrElse(body, Expression.Equal(unaryExpression, constantExpression));
|
|
|
//}
|
|
|
//return Expression.Lambda<Func<T, bool>>(body, parameter);
|
|
|
}
|
|
|
|
|
|
// object value = propertyValue;
|
|
|
ConstantExpression constant = proType.ToString() == "System.String"
|
|
|
? Expression.Constant(propertyValue) : Expression.Constant(propertyValue.ToString().ChangeType(proType));
|
|
|
|
|
|
UnaryExpression member = Expression.Convert(memberProperty, constant.Type);
|
|
|
Expression<Func<T, bool>> expression;
|
|
|
switch (expressionType)
|
|
|
{
|
|
|
//p=>p.propertyName == propertyValue
|
|
|
case LinqExpressionType.Equal:
|
|
|
expression = Expression.Lambda<Func<T, bool>>(Expression.Equal(member, constant), parameter);
|
|
|
break;
|
|
|
//p=>p.propertyName != propertyValue
|
|
|
case LinqExpressionType.NotEqual:
|
|
|
expression = Expression.Lambda<Func<T, bool>>(Expression.NotEqual(member, constant), parameter);
|
|
|
break;
|
|
|
// p => p.propertyName > propertyValue
|
|
|
case LinqExpressionType.GreaterThan:
|
|
|
expression = Expression.Lambda<Func<T, bool>>(Expression.GreaterThan(member, constant), parameter);
|
|
|
break;
|
|
|
// p => p.propertyName < propertyValue
|
|
|
case LinqExpressionType.LessThan:
|
|
|
expression = Expression.Lambda<Func<T, bool>>(Expression.LessThan(member, constant), parameter);
|
|
|
break;
|
|
|
// p => p.propertyName >= propertyValue
|
|
|
case LinqExpressionType.ThanOrEqual:
|
|
|
expression = Expression.Lambda<Func<T, bool>>(Expression.GreaterThanOrEqual(member, constant), parameter);
|
|
|
break;
|
|
|
// p => p.propertyName <= propertyValue
|
|
|
case LinqExpressionType.LessThanOrEqual:
|
|
|
expression = Expression.Lambda<Func<T, bool>>(Expression.LessThanOrEqual(member, constant), parameter);
|
|
|
break;
|
|
|
|
|
|
// p => p.propertyName.Contains(propertyValue)
|
|
|
// p => !p.propertyName.Contains(propertyValue)
|
|
|
case LinqExpressionType.Contains:
|
|
|
case LinqExpressionType.NotContains:
|
|
|
MethodInfo method = typeof(string).GetMethod("Contains", new[] { typeof(string) });
|
|
|
constant = Expression.Constant(propertyValue, typeof(string));
|
|
|
if (expressionType == LinqExpressionType.Contains)
|
|
|
{
|
|
|
expression = Expression.Lambda<Func<T, bool>>(Expression.Call(member, method, constant), parameter);
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
expression = Expression.Lambda<Func<T, bool>>(Expression.Not(Expression.Call(member, method, constant)), parameter);
|
|
|
}
|
|
|
break;
|
|
|
|
|
|
default:
|
|
|
// p => p.false
|
|
|
expression = False<T>();
|
|
|
break;
|
|
|
}
|
|
|
return expression;
|
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
|
/// 表达式转换成KeyValList(主要用于多字段排序，并且多个字段的排序规则不一样)
|
|
|
/// 如有多个字段进行排序,参数格式为
|
|
|
/// Expression<Func<Out_Scheduling, Dictionary<object, bool>>> orderBy = x => new Dictionary<object, bool>() {
|
|
|
/// { x.ID, true },
|
|
|
/// { x.DestWarehouseName, true }
|
|
|
/// };
|
|
|
/// 返回的是new Dictionary<object, bool>(){{}}key为排序字段，bool为升降序
|
|
|
/// </summary>
|
|
|
/// <typeparam name="T"></typeparam>
|
|
|
/// <param name="expression"></param>
|
|
|
/// <returns></returns>
|
|
|
public static IEnumerable<KeyValuePair<string, QueryOrderBy>> GetExpressionToPair<T>(this Expression<Func<T, Dictionary<object, QueryOrderBy>>> expression)
|
|
|
{
|
|
|
|
|
|
foreach (var exp in ((ListInitExpression)expression.Body).Initializers)
|
|
|
{
|
|
|
yield return new KeyValuePair<string, QueryOrderBy>(
|
|
|
exp.Arguments[0] is MemberExpression ?
|
|
|
(exp.Arguments[0] as MemberExpression).Member.Name.ToString()
|
|
|
: ((exp.Arguments[0] as UnaryExpression).Operand as MemberExpression).Member.Name,
|
|
|
(QueryOrderBy)((exp.Arguments[1] as ConstantExpression).Value));
|
|
|
}
|
|
|
}
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
/// 表达式转换成KeyValList(主要用于多字段排序，并且多个字段的排序规则不一样)
|
|
|
/// 如有多个字段进行排序,参数格式为
|
|
|
/// Expression<Func<Out_Scheduling, Dictionary<object, QueryOrderBy>>> orderBy = x => new Dictionary<object, QueryOrderBy>() {
|
|
|
/// { x.ID, QueryOrderBy.Desc },
|
|
|
/// { x.DestWarehouseName, QueryOrderBy.Asc }
|
|
|
/// };
|
|
|
/// 返回的是new Dictionary<object, QueryOrderBy>(){{}}key为排序字段，QueryOrderBy为排序方式
|
|
|
/// </summary>
|
|
|
/// <typeparam name="T"></typeparam>
|
|
|
/// <param name="expression"></param>
|
|
|
/// <returns></returns>
|
|
|
public static Dictionary<string, QueryOrderBy> GetExpressionToDic<T>(this Expression<Func<T, Dictionary<object, QueryOrderBy>>> expression)
|
|
|
{
|
|
|
//2020.09.14增加排序字段null值判断
|
|
|
if (expression == null)
|
|
|
{
|
|
|
return new Dictionary<string, QueryOrderBy>();
|
|
|
}
|
|
|
return expression.GetExpressionToPair().Reverse().ToList().ToDictionary(x => x.Key, x => x.Value);
|
|
|
}
|
|
|
/// <summary>
|
|
|
/// 解析多字段排序
|
|
|
/// </summary>
|
|
|
/// <typeparam name="TEntity"></typeparam>
|
|
|
/// <param name="queryable"></param>
|
|
|
/// <param name="orderBySelector">string=排序的字段,bool=true降序/false升序</param>
|
|
|
/// <returns></returns>
|
|
|
public static IQueryable<TEntity> GetIQueryableOrderBy<TEntity>(this IQueryable<TEntity> queryable, Dictionary<string, QueryOrderBy> orderBySelector)
|
|
|
{
|
|
|
string[] orderByKeys = orderBySelector.Select(x => x.Key).ToArray();
|
|
|
if (orderByKeys == null || orderByKeys.Length == 0) return queryable;
|
|
|
|
|
|
IOrderedQueryable<TEntity> queryableOrderBy = null;
|
|
|
// string orderByKey = orderByKeys[^1];
|
|
|
string orderByKey = orderByKeys[orderByKeys.Length-1];
|
|
|
queryableOrderBy = orderBySelector[orderByKey] == QueryOrderBy.Desc
|
|
|
? queryableOrderBy = queryable.OrderByDescending(orderByKey.GetExpression<TEntity>())
|
|
|
: queryable.OrderBy(orderByKey.GetExpression<TEntity>());
|
|
|
|
|
|
for (int i = orderByKeys.Length - 2; i >= 0; i--)
|
|
|
{
|
|
|
queryableOrderBy = orderBySelector[orderByKeys[i]] == QueryOrderBy.Desc
|
|
|
? queryableOrderBy.ThenByDescending(orderByKeys[i].GetExpression<TEntity>())
|
|
|
: queryableOrderBy.ThenBy(orderByKeys[i].GetExpression<TEntity>());
|
|
|
}
|
|
|
return queryableOrderBy;
|
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
|
/// 获取对象表达式指定属性的值
|
|
|
/// 如获取:Out_Scheduling对象的ID或基他字段
|
|
|
/// </summary>
|
|
|
/// <typeparam name="TEntity"></typeparam>
|
|
|
/// <param name="expression">格式 Expression<Func<Out_Scheduling, object>>sch=x=>new {x.v1,x.v2} or x=>x.v1 解析里面的值返回为数组</param>
|
|
|
/// <returns></returns>
|
|
|
public static string[] GetExpressionToArray<TEntity>(this Expression<Func<TEntity, object>> expression)
|
|
|
{
|
|
|
string[] propertyNames = null;
|
|
|
if (expression.Body is MemberExpression)
|
|
|
{
|
|
|
propertyNames = new string[] { ((MemberExpression)expression.Body).Member.Name };
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
propertyNames = expression.GetExpressionProperty().Distinct().ToArray();
|
|
|
}
|
|
|
return propertyNames;
|
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
|
/// 与下面and生成方式有所不同，如果直接用表达式1.2进行合并产会提示数据源不同的异常，只能使用下面的的and合并
|
|
|
/// 此种合并是在使用的同一个数据源(变量),生成的sql语句同样有性能问题(本身可以索引扫描的,生成的sql语句的case when变成索引查找)
|
|
|
/// <summary>
|
|
|
/// 通过字段动态生成where and /or表达
|
|
|
/// 如:有多个where条件，当条件成立时where 1=1 and/or 2=2,依次往后拼接
|
|
|
///
|
|
|
/// </summary>
|
|
|
/// <typeparam name="T"></typeparam>
|
|
|
/// <param name="listParas">ExpressionParameters
|
|
|
/// 1、Field生成的字段
|
|
|
/// 2、ExpressionType 表达式类型大于、小于、于大=、小于=、contains
|
|
|
/// 3、Value表达式的值
|
|
|
/// </param>
|
|
|
/// <returns></returns>
|
|
|
public static Expression<Func<T, bool>> And<T>(List<ExpressionParameters> listExpress)
|
|
|
{
|
|
|
return listExpress.Compose<T>(Expression.And);
|
|
|
}
|
|
|
/// <summary>
|
|
|
/// 同上面and用法相同
|
|
|
/// </summary>
|
|
|
/// <typeparam name="T"></typeparam>
|
|
|
/// <param name="listExpress"></param>
|
|
|
/// <returns></returns>
|
|
|
public static Expression<Func<T, bool>> Or<T>(this List<ExpressionParameters> listExpress)
|
|
|
{
|
|
|
return listExpress.Compose<T>(Expression.Or);
|
|
|
}
|
|
|
private static Expression<Func<T, bool>> Compose<T>(this List<ExpressionParameters> listExpress, Func<Expression, Expression, Expression> merge)
|
|
|
{
|
|
|
ParameterExpression parameter = Expression.Parameter(typeof(T), "p");
|
|
|
Expression<Func<T, bool>> expression = null;
|
|
|
foreach (ExpressionParameters exp in listExpress)
|
|
|
{
|
|
|
if (expression == null)
|
|
|
{
|
|
|
expression = exp.Field.GetExpression<T, bool>(parameter);
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
expression = expression.Compose(exp.Field.GetExpression<T, bool>(parameter), merge);
|
|
|
}
|
|
|
}
|
|
|
return expression;
|
|
|
}
|
|
|
/// <summary>
|
|
|
/// https://blogs.msdn.microsoft.com/meek/2008/05/02/linq-to-entities-combining-predicates/
|
|
|
/// 表达式合并(合并生产的sql语句有性能问题)
|
|
|
/// 合并两个where条件，如：多个查询条件时，判断条件成立才where
|
|
|
/// </summary>
|
|
|
/// <typeparam name="T"></typeparam>
|
|
|
/// <param name="first"></param>
|
|
|
/// <param name="second"></param>
|
|
|
/// <returns></returns>
|
|
|
public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second)
|
|
|
{
|
|
|
return first.Compose(second, Expression.And);
|
|
|
}
|
|
|
public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second)
|
|
|
{
|
|
|
return first.Compose(second, Expression.Or);
|
|
|
}
|
|
|
public static Expression<T> Compose<T>(this Expression<T> first, Expression<T> second, Func<Expression, Expression, Expression> merge)
|
|
|
{
|
|
|
// build parameter map (from parameters of second to parameters of first)
|
|
|
var map = first.Parameters.Select((f, i) => new { f, s = second.Parameters[i] }).ToDictionary(p => p.s, p => p.f);
|
|
|
// replace parameters in the second lambda expression with parameters from the first
|
|
|
var secondBody = ParameterRebinder.ReplaceParameters(map, second.Body);
|
|
|
// apply composition of lambda expression bodies to parameters from the first expression
|
|
|
return Expression.Lambda<T>(merge(first.Body, secondBody), first.Parameters);
|
|
|
}
|
|
|
|
|
|
public static IQueryable<Result> GetQueryableSelect<Source, Result>(this IQueryable<Source> queryable)
|
|
|
{
|
|
|
Expression<Func<Source, Result>> expression = CreateMemberInitExpression<Source, Result>();
|
|
|
return queryable.Select(expression);
|
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
|
/// 动态创建表达式Expression<Func<Animal, User>> expression = CreateMemberInitExpression<Animal, User>();
|
|
|
///结果为Expression<Func<Animal, User>> expression1 = x => new User() { Age = x.Age, Species = x.Species };
|
|
|
///参照文档https://docs.microsoft.com/zh-cn/dotnet/api/system.linq.expressions.memberinitexpression?redirectedfrom=MSDN&view=netframework-4.8
|
|
|
/// </summary>
|
|
|
/// <typeparam name="Source"></typeparam>
|
|
|
/// <typeparam name="Result"></typeparam>
|
|
|
/// <returns></returns>
|
|
|
public static Expression<Func<Source, Result>> CreateMemberInitExpression<Source, Result>(Type resultType = null)
|
|
|
{
|
|
|
resultType = resultType ?? typeof(Result);
|
|
|
ParameterExpression left = Expression.Parameter(typeof(Source), "p");
|
|
|
NewExpression newExpression = Expression.New(resultType);
|
|
|
PropertyInfo[] propertyInfos = resultType.GetProperties();
|
|
|
List<MemberBinding> memberBindings = new List<MemberBinding>();
|
|
|
foreach (PropertyInfo propertyInfo in propertyInfos)
|
|
|
{
|
|
|
MemberExpression member = Expression.Property(left, propertyInfo.Name);
|
|
|
MemberBinding speciesMemberBinding = Expression.Bind(resultType.GetMember(propertyInfo.Name)[0], member);
|
|
|
memberBindings.Add(speciesMemberBinding);
|
|
|
}
|
|
|
MemberInitExpression memberInitExpression = Expression.MemberInit(newExpression, memberBindings);
|
|
|
Expression<Func<Source, Result>> expression = Expression.Lambda<Func<Source, Result>>(memberInitExpression, new ParameterExpression[] { left });
|
|
|
return expression;
|
|
|
}
|
|
|
public static Expression<Func<Source, object>> CreateMemberInitExpression<Source>(Type resultType)
|
|
|
{
|
|
|
return CreateMemberInitExpression<Source, object>(resultType);
|
|
|
}
|
|
|
/// <summary>
|
|
|
/// 属性判断待完
|
|
|
/// </summary>
|
|
|
/// <param name="type"></param>
|
|
|
/// <returns></returns>
|
|
|
public static IEnumerable<PropertyInfo> GetGenericProperties(this Type type)
|
|
|
{
|
|
|
return type.GetProperties().GetGenericProperties();
|
|
|
}
|
|
|
/// <summary>
|
|
|
/// 属性判断待完
|
|
|
/// </summary>
|
|
|
/// <param name="properties"></param>
|
|
|
/// <returns></returns>
|
|
|
public static IEnumerable<PropertyInfo> GetGenericProperties(this IEnumerable<PropertyInfo> properties)
|
|
|
{
|
|
|
return properties.Where(x => !x.PropertyType.IsGenericType && x.PropertyType.GetInterface("IList") == null || x.PropertyType.GetInterface("IEnumerable", false) == null);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
public class ExpressionParameters
|
|
|
{
|
|
|
public string Field { get; set; }
|
|
|
public LinqExpressionType ExpressionType { get; set; }
|
|
|
public object Value { get; set; }
|
|
|
// public
|
|
|
}
|
|
|
public class ParameterRebinder : ExpressionVisitor
|
|
|
{
|
|
|
|
|
|
private readonly Dictionary<ParameterExpression, ParameterExpression> map;
|
|
|
public ParameterRebinder(Dictionary<ParameterExpression, ParameterExpression> map)
|
|
|
{
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this.map = map ?? new Dictionary<ParameterExpression, ParameterExpression>();
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|
}
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|
|
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|
public static Expression ReplaceParameters(Dictionary<ParameterExpression, ParameterExpression> map, Expression exp)
|
|
|
{
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|
|
return new ParameterRebinder(map).Visit(exp);
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|
}
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|
|
protected override Expression VisitParameter(ParameterExpression p)
|
|
|
{
|
|
|
ParameterExpression replacement;
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|
|
if (map.TryGetValue(p, out replacement))
|
|
|
{
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|
|
p = replacement;
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|
|
}
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|
return base.VisitParameter(p);
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|
|
}
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|
|
}
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|
/// <summary>
|
|
|
///
|
|
|
/// </summary>
|
|
|
public static class QueryableExtensions
|
|
|
{
|
|
|
public static IQueryable<T> OrderBy<T>(this IQueryable<T> queryable, string propertyName)
|
|
|
{
|
|
|
return QueryableHelper<T>.OrderBy(queryable, propertyName, false);
|
|
|
}
|
|
|
public static IQueryable<T> OrderBy<T>(this IQueryable<T> queryable, string propertyName, bool desc)
|
|
|
{
|
|
|
return QueryableHelper<T>.OrderBy(queryable, propertyName, desc);
|
|
|
}
|
|
|
static class QueryableHelper<T>
|
|
|
{
|
|
|
private static Dictionary<string, LambdaExpression> cache = new Dictionary<string, LambdaExpression>();
|
|
|
public static IQueryable<T> OrderBy(IQueryable<T> queryable, string propertyName, bool desc)
|
|
|
{
|
|
|
dynamic keySelector = GetLambdaExpression(propertyName);
|
|
|
return desc ? Queryable.OrderByDescending(queryable, keySelector) : Queryable.OrderBy(queryable, keySelector);
|
|
|
}
|
|
|
private static LambdaExpression GetLambdaExpression(string propertyName)
|
|
|
{
|
|
|
//if (cache.ContainsKey(propertyName)) return cache[propertyName];
|
|
|
var param = Expression.Parameter(typeof(T));
|
|
|
var body = Expression.Property(param, propertyName);
|
|
|
var keySelector = Expression.Lambda(body, param);
|
|
|
//cache[propertyName] = keySelector;
|
|
|
return keySelector;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
public class OrderField
|
|
|
{
|
|
|
public string Name { get; set; }
|
|
|
public bool Desc { get; set; }
|
|
|
|
|
|
public OrderField(string name, bool desc = false)
|
|
|
{
|
|
|
Name = name;
|
|
|
Desc = desc;
|
|
|
}
|
|
|
|
|
|
}
|
|
|
/// <summary>
|
|
|
/// 扩展方法 distinctby
|
|
|
/// 典型引用方法
|
|
|
/// var query = people.DistinctBy(p => new { p.Id, p.Name });
|
|
|
/// var query = people.DistinctBy(p => p.Id);
|
|
|
/// </summary>
|
|
|
public static class DistinctByClass
|
|
|
{
|
|
|
public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
|
|
|
{
|
|
|
HashSet<TKey> seenKeys = new HashSet<TKey>();
|
|
|
foreach (TSource element in source)
|
|
|
{
|
|
|
if (seenKeys.Add(keySelector(element)))
|
|
|
{
|
|
|
yield return element;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
}
|