如何以正确的方式初始化KeyValuePair对象?

问题描述

我(除其他外)见过，人们想知道如何初始化 KeyValuePair 的实例，该实例应该看起来像这样.

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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