在特定位置添加一个词典元素 [英] Adding a dictionary element at a specific place

问题描述

考虑下面的代码：

var myDict = new Dictionary<string, int>();

myDict.Add("Key1", 1);
myDict.Add("Key2", 2);
myDict.Add("Key4", 4);
myDict.Add("Key5", 5);

foreach (KeyValuePair<string, int> pair in myDict)
{
    Console.Write(pair.Key + @" --> ");
    Console.WriteLine(pair.Value);
}

myDict.Add("Key3", 3);
foreach (KeyValuePair<string, int> pair in myDict)
{
    Console.Write(pair.Key + @" --> ");
    Console.WriteLine(pair.Value);
}

我想要做的就是插入密钥3 之间密钥2和KEY4。我用这作为简单起见一个例子。我知道我可以用一个SortedDictionary，我能得到这个例子的工作。我需要能够专门做的虽然是，每当我插入一个新元素到字典，我总是希望它的第二个元素后第三元素之前插入。我怎样才能做到这一点？

What I want to do is insert "Key3" in between "Key2" and "Key4". I am using this as an example for simplicity's sake. I know I could use a SortedDictionary and I could get this example to work. What I need to be able to do specifically though is, whenever I insert a new element into the dictionary, I ALWAYS want it to insert it after the 2nd element and before the 3rd element. How can I accomplish this?

推荐答案

您可以使用的 OrderedDictionary 这一点。 OrderedDictionary.Insert 允许你指定在该密钥将被插入的索引。

You can use an OrderedDictionary for this. OrderedDictionary.Insert allows you to specify the index at which the key will be inserted.

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