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5. LinqExpression 静态类

5.1 创建一个表达式

var expression = LinqExpression.Create<T>(u => u.Id == 1);
var expression2 = LinqExpression.Create<T>((u,i) => u.Id == 1 && i > 0);

5.2 拼接两个表达式

// 创建一个初始化的表达式
var expression = LinqExpression.And();
var expression2 = LinqExpression.IndexAnd();
var expression3 = LinqExpression.Or();
var expression4 = LinqExpression.IndexOr();

// 拼接表达式
var expression5 = expression.And(expression2);
var expression6 = expression.AndIf(age > 18, expression2);
var expression7 = expression.Or(expression2);
var expression8 = expression.OrIf(age > 18, expression2);

// 获取表达式属性名
var properyName = expression.GetExpressionPropertyName(u => u.Name);    // Name