You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.2 KiB
C#
44 lines
1.2 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
using System.Linq.Expressions;
|
|
|
|
namespace AddWhere
|
|
{
|
|
public static class PredicateExtensions
|
|
{
|
|
|
|
public static Expression<Func<T, bool>> True<T>() { return f => true; }
|
|
public static Expression<Func<T, bool>> False<T>() { return f => false; }
|
|
|
|
public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> expression1,
|
|
Expression<Func<T, bool>> expression2)
|
|
{
|
|
|
|
var invokedExpression = Expression.Invoke(expression2, expression1.Parameters.Cast<Expression>());
|
|
|
|
return Expression.Lambda<Func<T, bool>>
|
|
|
|
(Expression.Or(expression1.Body, invokedExpression), expression1.Parameters);
|
|
}
|
|
|
|
|
|
|
|
public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> expression1,
|
|
Expression<Func<T, bool>> expression2)
|
|
{
|
|
|
|
var invokedExpression = Expression.Invoke(expression2, expression1.Parameters.Cast<Expression>());
|
|
|
|
return Expression.Lambda<Func<T, bool>>
|
|
|
|
(Expression.And(expression1.Body, invokedExpression), expression1.Parameters);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|