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.Text;
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using System.Threading.Tasks;
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namespace HH.WCS.Mobox3.WeiLi.wms
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{
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internal static class ExpressionHelper {
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public static Expression<Func<T, bool>> AndAlso<T>(this Expression<Func<T, bool>> left, Expression<Func<T, bool>> right) {
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var invokedExpr = Expression.Invoke(right, left.Parameters);
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return Expression.Lambda<Func<T, bool>>(Expression.AndAlso(left.Body, invokedExpr), left.Parameters);
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}
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public class Person {
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public string Name { get; set; }
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public int Age { get; set; }
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}
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public static void test() {
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var list=new List<Person>();
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list.Add(new Person {Age=1, Name="111" });
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list.Add(new Person { Age = 1, Name = "222" });
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list.Add(new Person { Age = 1, Name = "333" });
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list.Add(new Person { Age = 2, Name = "111" });
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list.Add(new Person { Age = 2, Name = "222" });
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list.Add(new Person { Age = 2, Name = "333" });
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list.Add(new Person { Age = 3, Name = "111" });
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list.Add(new Person { Age = 3, Name = "222" });
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list.Add(new Person { Age = 3, Name = "333" });
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Expression<Func<Person, bool>> expression = x => x.Age >= 2;
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expression = expression.AndAlso(x => x.Name =="111");
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var data=list.Where(expression.Compile()).ToList();
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}
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}
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}
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