36 lines
1.2 KiB
C#
36 lines
1.2 KiB
C#
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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namespace Model
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{
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public static class PredicateExtensions
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{
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public static Expression<Func<T, bool>> True<T>() { return f => true; }
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public static Expression<Func<T, bool>> False<T>() { return f => false; }
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public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> expression1,
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Expression<Func<T, bool>> expression2)
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{
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var invokedExpression = Expression.Invoke(expression2, expression1.Parameters
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.Cast<Expression>());
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return Expression.Lambda<Func<T, bool>>(Expression.Or(expression1.Body, invokedExpression),
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expression1.Parameters);
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}
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public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> expression1,
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Expression<Func<T, bool>> expression2)
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{
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var invokedExpression = Expression.Invoke(expression2, expression1.Parameters
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.Cast<Expression>());
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return Expression.Lambda<Func<T, bool>>(Expression.And(expression1.Body,
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invokedExpression), expression1.Parameters);
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}
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}
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}
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