确定是否在列表的两个或多个对象根据一些属性是相等 [英] Determine whether two or more objects in a list are equal according to some property

问题描述

说我有一个List 名单，其中，为MyObject＆GT; myObjectList 。该为MyObject 对象有一个名为订单这类型的属性 INT 。我怎样才能确定 myObjectList 两个或多个对象是否具有相同的订单使用LINQ到对象？

Say I have a list List<MyObject> myObjectList. The MyObject object has a property named Order which is of type int. How can I determine whether two or more objects in myObjectList have the same Order using LINQ-to-objects?

推荐答案

首先<一href="http://msdn.microsoft.com/en-us/library/system.linq.enumerable.groupby.aspx"><$c$c>GroupBy MyObject.Order 然后再确定是否的 任何 的群体有一个以上的成员：

First GroupBy MyObject.Order and then determine if Any of the groups have more than one member:

bool b = myObjectList.GroupBy(x => x.Order)
                     .Any(g => g.Count() > 1);
// b is true is there are at least two objects with the same Order
// b is false otherwise

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