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167 lines
5.2 KiB
C#

12 months ago
using System.Globalization;
using System.Text;
using System.Text.RegularExpressions;
namespace DS.Module.Core.Extensions;
public static class StringExtensions
{
/// <summary>
/// sql
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static bool IsSqlInjection(this string input)
{
3 months ago
string[] sqlCheckList = { "TRUNCATE", "INSERT", "UPDATE", "DELETE", "DROP", "--" };
foreach (string item in sqlCheckList)
{
if (input.IndexOf(item, StringComparison.OrdinalIgnoreCase) >= 0)
{
return true;
}
}
return false;
}
12 months ago
/// <summary>
/// 以指定字符串作为分隔符将指定字符串分隔成数组
/// </summary>
/// <param name="value">要分割的字符串</param>
/// <param name="strSplit">字符串类型的分隔符</param>
/// <param name="removeEmptyEntries">是否移除数据中元素为空字符串的项</param>
/// <returns>分割后的数据</returns>
public static string[] Split(this string value, string strSplit, bool removeEmptyEntries = false)
{
value.NotNullOrEmpty(nameof(value));
strSplit.NotNullOrEmpty(nameof(strSplit));
return value.Split(new[] { strSplit },
removeEmptyEntries ? StringSplitOptions.RemoveEmptyEntries : StringSplitOptions.None);
}
/// <summary>
/// 将字符中拼接
/// </summary>
/// <param name="value"></param>
/// <param name="left"></param>
/// <param name="right"></param>
/// <param name="separator"></param>
/// <returns></returns>
public static string StrToJoin(this string value, string left, string right, string separator = ",")
{
value.NotNullOrEmpty(nameof(value));
left.NotNullOrEmpty(nameof(left));
right.NotNullOrEmpty(nameof(right));
StringBuilder sb = new StringBuilder();
if (!value.IsNullOrEmpty())
{
foreach (var item in value.Split(separator))
{
sb.AppendFormat("{0}{1}{2}{3}", left, item, right, separator);
}
}
return sb.ToString().TrimEnd(separator.ToCharArray());
}
/// <summary>
///把字符串转成SQL中IN
/// </summary>
/// <param name="value">要转换的值</param>
/// <param name="left">左边符</param>
/// <param name="right">右边符</param>
/// <param name="inMiddleSeparator">in里面中间分割符:"'a','b'"</param>
/// <param name="valueSeparator">值分割符如:"a,b,c,d"</param>
/// <returns>返回组装好的值,例如"'a','b'"</returns>
public static string ToSqlIn(this string value, string left = "'", string right = "'",
string inMiddleSeparator = ",",
string valueSeparator = ",")
{
value.NotNullOrEmpty(nameof(value));
StringBuilder sb = new StringBuilder();
if (!value.IsNullOrEmpty())
{
foreach (var item in value.Split(valueSeparator))
{
sb.AppendFormat("{0}{1}{2}{3}", left, item, right, inMiddleSeparator);
}
}
else
{
return value;
}
return sb.ToString().TrimEnd(inMiddleSeparator.ToCharArray());
}
/// <summary>
/// 是否为空或者为null或者空格
/// </summary>
/// <param name="value">要判断的值</param>
/// <returns>返回true/false</returns>
public static bool IsNullOrWhiteSpace(this string value)
{
return string.IsNullOrWhiteSpace(value);
}
/// <summary>
/// 是否为空或者为null
/// </summary>
/// <param name="value">要判断的值</param>
/// <returns>返回true/false</returns>
public static bool IsNullOrEmpty(this string value)
{
return string.IsNullOrEmpty(value);
}
/// <summary>
/// 判断是否数字
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public static bool IsInt(this string value)
{
return Regex.IsMatch(value, @"^[0-9]*$");
}
/// <summary>
/// 在指定的输入字符串中搜索指定的正则表达式的第一个匹配项
/// </summary>
/// <param name="value">要搜索匹配项的字符串</param>
/// <param name="pattern">要匹配的正则表达式模式</param>
/// <returns>一个对象,包含有关匹配项的信息</returns>
public static string Match(this string value, string pattern)
{
if (value == null)
{
return null;
}
return Regex.Match(value, pattern).Value;
}
public static string FormatWith(this string format, params object[] args)
{
format.NotNull("format");
return string.Format(CultureInfo.CurrentCulture, format, args);
}
/// <summary>
/// 将驼峰字符串的第一个字符小写
/// </summary>
public static string LowerFirstChar(this string str)
{
if (string.IsNullOrEmpty(str) || !char.IsUpper(str[0]))
{
return str;
}
if (str.Length == 1)
{
return char.ToLower(str[0]).ToString();
}
return char.ToLower(str[0]) + str.Substring(1, str.Length - 1);
}
}