項目中用到，找不到出處了

1. 添加類：

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);}}

?

2. 用法：

Expression<Func<XXX, bool>> expression = t => true;expression = expression.And(t => t.AAA == 1);expression = expression.And(t => t.BBB > 1);var ds = products.AsQueryable().Where(expression).ToList();

轉載于:https://www.cnblogs.com/paopaohui/p/7885954.html

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