.NET实施一个属性过滤器 [英] Implement a Properties Filter in .NET

问题描述

我不得不筛选对象的列表。

I have to filter a list of objects.

过滤器应采用逻辑或/与运营商，以及使用括号分组用户组成。

The filter should be composed by users using logical OR / AND operators, and grouping using brackets.

说，是这样的：

说，我们有对象MyObj中和它的属性为prop1，Prop2，Prop3

Say, we have object MyObj and its properties Prop1, Prop2, Prop3

有myObjList用户可以过滤元素，为prop1 ==安勤和Prop2＆LT; otherValue或Prop2> thirdvalue

Having myObjList the user could filter elements that Prop1 == aValue AND Prop2 < otherValue OR Prop2 > thirdvalue

有一些已知的（反射）机制，允许管理此类型的过滤操作？

Is there some known (reflection) mechanisms that permits to manage this kind of filtering operations?

推荐答案

建立前pression树，然后编译他们给你，你可以向你要过滤的对象的委托。

Build expression trees, then compile them to give you a delegate which you can apply to the objects you want to filter.

MSDN有一些介绍报道： http://msdn.microsoft.com/ EN-US /库/ bb397951.aspx

MSDN has some introductory coverage: http://msdn.microsoft.com/en-us/library/bb397951.aspx

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