字典是否可以将数组作为键? [英] Whether a Dictionary can have Array as Key?

问题描述

Am在字典中遇到问题. 数组是否可以是值的键??

Am Facing a problem in Dictionaries. Whether an Array can be a Key of a Value???

Dictionary<string[], int> di = new Dictionary<string[], int>();
di.Add(new string[]
{
    "1","2"
}, 1);

di.Add(new string[]
{
    "2","3"
}, 2);

MessageBox.Show(di[new string[] { "2", "3" }].ToString()); // Here KeyNotFoundException occurred.

为什么要例外?

推荐答案

默认情况下，仅比较数组的引用，因此您要么必须

By default only references of the arrays would be compared, so you either have to

1. 提供自定义 IEqualityComparer<string[]> 或
2. 使用 Tuple<string, string> 作为键(因为您只有两个字符串)

这是一个类似的问题的答案，其中显示了如何为

Here's a similar question's answer which shows how to create a custom comparer for the Dictionary- constructor.

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