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This commit is contained in:
hogan
2019-01-14 18:01:01 +08:00
parent d9c0ba52fa
commit 92afa4fb6d
35 changed files with 1411 additions and 29 deletions
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35
Examples/website/FreeSql.Site.UI/Common/PredicateExtensions.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;
namespace FreeSql.Site.UI.Common
{
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);
}
}
}