62 lines
2.5 KiB
C#
62 lines
2.5 KiB
C#
//using System;
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//using System.Linq.Expressions;
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//namespace IRaCIS.Core.Infrastructure.ExpressionExtend
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//{
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// /// <summary>
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// /// 合并表达式 And Or Not扩展
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// /// </summary>
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// public static class ExpressionExtend
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// {
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// /// <summary>
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// /// 合并表达式 expr1 AND expr2
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// /// </summary>
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// /// <typeparam name="T"></typeparam>
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// /// <param name="expr1"></param>
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// /// <param name="expr2"></param>
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// /// <returns></returns>
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// public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> expr1, Expression<Func<T, bool>> expr2)
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// {
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// if (expr1 == null) return expr2;
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// else if (expr2 == null) return expr1;
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// //return Expression.Lambda<Func<T, bool>>(Expression.AndAlso(expr1.Body, expr2.Body), expr1.Parameters);
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// ParameterExpression newParameter = Expression.Parameter(typeof(T), "c");
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// NewExpressionVisitor visitor = new NewExpressionVisitor(newParameter);
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// var left = visitor.Replace(expr1.Body);
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// var right = visitor.Replace(expr2.Body);
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// var body = Expression.And(left, right);
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// return Expression.Lambda<Func<T, bool>>(body, newParameter);
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// }
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// /// <summary>
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// /// 合并表达式 expr1 or expr2
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// /// </summary>
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// /// <typeparam name="T"></typeparam>
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// /// <param name="expr1"></param>
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// /// <param name="expr2"></param>
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// /// <returns></returns>
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// public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> expr1, Expression<Func<T, bool>> expr2)
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// {
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// if (expr1 == null) return expr2;
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// else if (expr2 == null) return expr1;
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// ParameterExpression newParameter = Expression.Parameter(typeof(T), "c");
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// NewExpressionVisitor visitor = new NewExpressionVisitor(newParameter);
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// var left = visitor.Replace(expr1.Body);
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// var right = visitor.Replace(expr2.Body);
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// var body = Expression.Or(left, right);
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// return Expression.Lambda<Func<T, bool>>(body, newParameter);
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// }
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// public static Expression<Func<T, bool>> Not<T>(this Expression<Func<T, bool>> expr)
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// {
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// if (expr == null) return null;
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// var candidateExpr = expr.Parameters[0];
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// var body = Expression.Not(expr.Body);
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// return Expression.Lambda<Func<T, bool>>(body, candidateExpr);
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// }
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// }
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//}
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