如何使用LINQ过滤字典并将其返回相同类型的字典 [英] How can I filter a dictionary using LINQ and return it to a dictionary from the same type

问题描述

我有以下字典:

Dictionary<int,string> dic = new Dictionary<int,string>();
dic[1] = "A";
dic[2] = "B";

我想过滤字典中的项目并将结果重新分配给相同的变量:

I want to filter the dictionary's items and reassign the result to the same variable:

dic = dic.Where (p => p.Key == 1);

如何以相同类型[<int,string>]的字典形式返回结果?

How can I return the result as a dictionary from the same type [<int,string>] ?

我尝试了ToDictionary，但是没有用.

I tried ToDictionary, but it doesn't work.

提前谢谢.

推荐答案

ToDictionary是解决方法.它确实起作用-您可能是错误地使用了它.试试这个:

ToDictionary is the way to go. It does work - you were just using it incorrectly, presumably. Try this:

dic = dic.Where(p => p.Key == 1)
         .ToDictionary(p => p.Key, p => p.Value);

话虽如此，我假设您真的想要一个不同的Where过滤器，因为您当前的过滤器只会找到一个键...

Having said that, I assume you really want a different Where filter, as your current one will only ever find one key...

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