C#值和引用类型 [英] C# Value and Reference types

问题描述

请参见下面提到的以下代码行:

Please see the following lines of code mentioned below:

byte[] a = { 1, 2, 3, 4 };
byte[] b = a; // b will have all values of a.
a = null; 

在C#中，byte[]是引用类型.现在，如果第3行中的a = null，那么为什么b由于其引用类型而不为null.如果我们选中b，它将仍然具有所有a值.

In C# byte[] is a reference type. Now if a = null in line 3, then why b is not null since its a reference type. If we check b it will still have all values of a.

推荐答案

正如您所说，byte[]是与所有其他数组一样的引用类型.让我们逐行分析样本；

As you said, byte[] is a reference type like all other arrays. Let's analyze your sample line by line;

byte[] a = { 1, 2, 3, 4 };

->您在内存中创建了一个字节数组，并且a是对该数组的引用.

--> You created a byte array in memory and a is a reference that array.

byte[] b = a;

->您的b所引用的对象与a是{ 1, 2, 3, 4 }，但它们是不同的引用.

--> Your b is referencing the same object with a which is { 1, 2, 3, 4 } but they are different references.

a = null;

->您的a没有引用内存中的任何位置，但这不会影响b.

--> Your a is not referencing anywhere in the memory but that doesn't effect b.

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