带有引用类型变量的对象类型装箱 [英] Object type boxing with a reference type variable

问题描述

装箱是将值类型分配给对象类型时.将引用类型分配给对象时是否相同?

Boxing is when a value type is assigned to an object type. Is it the same when a reference type is assigned to an object?

分配类型(不是对象)后，会发生什么?那个拳击也是吗?

When a type (which isn't object) is assigned, what happens? Is that boxing too?

    int num=5;
    object obj = num;  //boxing
    //////////////////////
    MyClass my = new MyClass();
    object obj = my; //what is name this convert  (whethere is boxing?)

推荐答案

我假设您的意思是

string s = "hello";
object x = s;        // no boxing, just implict conversion to base-type.

之所以可行，是因为 System.String 与所有其他类一样，是从 System.Object :

This works because System.String, like all other classes, derives from System.Object:

public sealed class String : Object { ... }

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