使用LINQ找到跨越多个属性重复 [英] Using LINQ to find duplicates across multiple properties

问题描述

给定一个类定义如下：

public class MyTestClass
{
    public int ValueA { get; set; }
    public int ValueB { get; set; }
}

如何能重复值在一个MyTestClass []数组中？

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 };

包含重复的有两个MyTestClass对象，其中值a 和 valueB，则既= 1

Contains a duplicate as there are two MyTestClass objects where ValueA and ValueB both = 1

推荐答案

您可以通过将你的元素通过值a和valueB找到你的副本。 做一个计数他们之后，你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.

这是你将如何隔离受骗者：

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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