什么是“本”关键字在C＃中的目的 [英] What is the purpose of 'this' keyword in C#

问题描述

由于方法内声明的变量只在该方法是可用的，和变量声明的类中的私有只提供一类中。什么是这个键字的目的是什么？我为什么要具备以下条件：

Since variables declared inside a method are available only within that method, and variables declared private within a class are only available within a class. What is the purpose of the this key word? Why would I want to have the following:

private static class SomeClass : ISomeClass
{
    private string variablename;
    private void SomeMethod(string toConcat)
    {
        this.variablename = toConcat+toConcat;
        return this.variablename;
    }
}

在此会做同样的事情：

private static class SomeClass : ISomeClass
{
    private string variablename;
    private void SomeMethod(string toConcat)
    {
        variablename = toConcat+toConcat;
        return variablename;
    }
}

练习我的打字技能？

to practice my typing skills?

推荐答案

有一对夫妇的情况下，如果它的问题：

There are a couple of cases where it matters:

• 如果你有一个函数参数，并具有相同名称的成员变量，你必须能够区分它们：

• If you have a function parameter and a member variable with the same names, you need to be able to distinguish them:

class Foo {
  public Foo(int i) { this.i = i; }


  private int i;
}

如果你确实需要引用的当前对象的，而不是它的成员之一。也许你需要将它传递给另外一个函数：

If you actually need to reference the current object, rather than one of its members. Perhaps you need to pass it to another function:

class Foo {
  public static DoSomething(Bar b) {...}
}


class Bar {
  public Bar() { Foo.DoSomething(this); }
}

当然，如果你想同样也适用于的收益当前对象的引用

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