如何以正确的方式初始化KeyValuePair对象? [英] How to initialize KeyValuePair object the proper way?

问题描述

我(除其他外)见过

I've seen in (amongst others) this question that people wonder how to initialize an instance of KeyValuePair, which expectedly should look like this.

KeyValuePair<int, int> keyValuePair = new KeyValuePair<int, int>
{ 
  Key = 1,
  Value = 2
};

它不起作用，就好像属性不存在一样. Intead，我需要使用这样的构造函数.

It doesn't work, as if the properties aren't there. Intead, I need to use the constructor like this.

KeyValuePair<int, int> keyValuePair = new KeyValuePair<int, int>(1, 2);

语法较短，但令我困扰的是我无法使用初始化程序.我在做什么错了?

Admittedly shorter syntax but it bothers me that I can't use the initializer. What am I doing wrong?

推荐答案

您没有错，您必须使用以下方法初始化keyValuePair

You are not wrong you have to initialise a keyValuePair using

KeyValuePair<int, int> keyValuePair = new KeyValuePair<int, int>(1, 2);

之所以不能使用对象初始化语法(即{Key = 1，Value = 2})，是因为Key和Value属性没有只有setter的setter(它们是只读的).所以你甚至不能做:

The reason that you cannot use the object initialisation syntax ie { Key = 1, Value = 2 } is because the Key and Value properties have no setters only getters (they are readonly). So you cannot even do:

keyValuePair.Value = 1; // not allowed

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