本文介绍了使用 LINQ 跨多个属性查找重复项的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
给定一个具有以下定义的类:
Given a class with the following definition:
public class MyTestClass
{
public int ValueA { get; set; }
public int ValueB { get; set; }
}
如何在 MyTestClass[] 数组中找到重复值?
How can duplicate values be found in a MyTestClass[] array?
例如，
MyTestClass[] items = new MyTestClass[3];
items[0] = new MyTestClass { ValueA = 1, ValueB = 1 };
items[1] = new MyTestClass { ValueA = 0, ValueB = 1 };
items[2] = new MyTestClass { ValueA = 1, ValueB = 1 };
包含重复项，因为有两个 MyTestClass 对象，其中 ValueA 和 ValueB 都 = 1
Contains a duplicate as there are two MyTestClass objects where ValueA and ValueB both = 1
推荐答案
您可以通过按 ValueA 和 ValueB 对元素进行分组来查找重复项.之后对它们进行计数，您会发现哪些是重复的.
You can find your duplicates by grouping your elements by ValueA and ValueB. Do a count on them afterwards and you will find which ones are duplicates.
这就是你隔离受骗者的方法:
This is how you would isolate the dupes :
var duplicates = items.GroupBy(i => new {i.ValueA, i.ValueB})
.Where(g => g.Count() > 1)
.Select(g => g.Key);
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