你如何按值对字典进行排序? [英] How do you sort a dictionary by value?

问题描述

我经常需要对由键和键组成的字典进行排序.值，按值.例如，我有一个单词和相应频率的散列，我想按频率排序.

I often have to sort a dictionary, consisting of keys & values, by value. For example, I have a hash of words and respective frequencies, that I want to order by frequency.

有一个 SortedList 适合单个值(比如频率)，我想将它映射回单词.

There is a SortedList which is good for a single value (say frequency), that I want to map it back to the word.

SortedDictionary 按键而非值排序.有些人求助于自定义类，但有更简洁的方法吗?

SortedDictionary orders by key, not value. Some resort to a custom class, but is there a cleaner way?

推荐答案

使用:

using System.Linq.Enumerable;
...
List<KeyValuePair<string, string>> myList = aDictionary.ToList();

myList.Sort(
    delegate(KeyValuePair<string, string> pair1,
    KeyValuePair<string, string> pair2)
    {
        return pair1.Value.CompareTo(pair2.Value);
    }
);

由于您的目标是 .NET 2.0 或更高版本，您可以将其简化为 lambda 语法——它等效，但更短.如果您的目标是 .NET 2.0，则只有在使用 Visual Studio 2008(或更高版本)的编译器时才能使用此语法.

Since you're targeting .NET 2.0 or above, you can simplify this into lambda syntax -- it's equivalent, but shorter. If you're targeting .NET 2.0 you can only use this syntax if you're using the compiler from Visual Studio 2008 (or above).

var myList = aDictionary.ToList();

myList.Sort((pair1,pair2) => pair1.Value.CompareTo(pair2.Value));

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