这个关键字作为属性 [英] this keyword as a property

问题描述

我知道C＃很好，但它是一些奇怪的事情对我来说。
在一些旧的程序，我看到这个代码：

I know c# well, but it is something strange for me. In some old program, I have seen this code:

public MyType this[string name]
{
    ......some code that finally return instance of MyType
}

如何它叫什么名字？有什么用这个？

How it is called? What is the use of this?

推荐答案

这是的索引。当你宣布它，你可以这样做：

It is indexer. After you declared it you can do like this:

class MyClass
{
    Dictionary<string, MyType> collection;
    public MyType this[string name]
    {
        get { return collection[name]; }
        set { collection[name] = value; }
    }
}

// Getting data from indexer.
MyClass myClass = ...
MyType myType = myClass["myKey"];

// Setting data with indexer.
MyType anotherMyType = ...
myClass["myAnotherKey"] = anotherMyType;

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