引用类型，值类型怀疑 [英] Reference type, value type doubt

问题描述

这是一个使我感到困惑的基本问题.
这是示例代码..

This is a basic question which is confusing me..
Here is the sample code..

class Program
    {
        static void Main(string[] args)
        {
            c obj = new c();
            obj.a = 11;

        }
    }
    class c
    {
        public int a = 10;
    }

现在我的问题是我们知道整数是一个值类型，而类/对象是引用类型..

那么obj.a现在a是引用类型的值类型吗?

因为无需装箱，我们可以直接为obj.a = 11分配一个值，这表明它是一个值类型..但是在引用类型为obj的对象obj下不是"a"吗?
它如何在内部存储?
"a"存储在哪里?
"obj"存储在哪里?

据我所知a应该存储在堆栈中，因为它是值类型，而obj在堆中，因为它是引用类型..但是它们如何关联?堆可以容纳堆栈吗?

Now my question is we know integer is a value type and classes/objects are reference types..

Then obj.a now a is a value type of a reference type ?

since without boxing we can directly assign a value to obj.a = 11 which suggests that it is a value type.. but isn''t "a" under the object obj which is reference type ?

How it is stored internally ?
Where is "a" stored ?
where is "obj" stored?

as far as I know a should be stored in a stack as it is value type and obj in heap as it is reference type.. but how they are associated ? can heap hold stack ? how does it work ?

推荐答案

您对对象和引用类型有了更多的了解.

但是我认为这一声明将消除您的困惑.

"a的值由通过蓝色打印(类)c创建的每个object引用"

对于c的每个对象，通过分配a的值将不会直接包含a的值，而是内容包含a的引用地址.

因此，这意味着通过更改a的值将在类c的每个对象内更改a的值.

我希望您现在对此有所了解.

You''ve got lot more understanding on Object and reference type.

But I think this one statement will clear your confusion.

"value of a is referenced by each of object created from blue print(class) c"

For every object of c by assigning value of a will not directly contain value of a but rather it content reference address of a.

So that mean by changing a value of a will change value of a inside every object of class c.

I hope you may have now some idea around.

请在MSDN上阅读此内容，尤其是"ObjectInstance"和"Base Instance Size"，这应该消除您的困惑: ^ ]

如果您仍有疑问，请发表评论.
但是请阅读这篇文章.

问候，
Manfred

Please read this on MSDN especially "ObjectInstance" and "Base Instance Size" that should clear you confusion: See How the CLR Creates Runtime Objects
[^]

If you still have some doubts, leave a comment.
But please read this article.

Regards,
Manfred

字段a是值类型，它是c的类定义的一部分. obj.a仍然是值类型.

确切地说，如何在内部存储它是我们在C#中进行开发时往往会忽略的事情.可以想象，它可以在.Net版本之间进行更改.不过，"int a"存储为32位整数.可以使用System.Runtime.InteropServices命名空间中的属性指定值类型的布局.

问候
Espen Harlinn

The field a is a value type that is a part of your class definition for c. obj.a is still a value type.

Exactly how it''s stored internally is something we tend to disregard when we develop in C#. It can conceivably change between .Net versions. The "int a" is stored as a 32-bit integer though. The layout of Value types can be specified using attributes from the System.Runtime.InteropServices namespace.

Regards
Espen Harlinn

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