C#中的引用类型比较 [英] Reference Type comparison in C#

问题描述

我正在尝试了解以下问题.我想知道为什么在下面的程序中B == A和C == B是错误的.

I am trying to understand below problem. I want to know why B == A and C == B are false in the following program.

using System;

namespace Mk
{
    public class Class1
    {
        public int i = 10;
    }
    class Program
    {
        static void Main(string[] args)
        {
            Class1 A = new Class1();
            Class1 B = new Class1();
            Class1 C = A;

            Console.WriteLine(B == A);
            Console.WriteLine(C == B);
        }
    }
}

输出:

错误
错误

False
False

推荐答案

在.NET中，类是引用类型.引用类型有两件事. 对象 和 对象引用 .

In .NET, classes are reference types. Reference types has two thing. Object and a reference to object.

在您的情况下，A是对ObjectA的引用，B是对ObjectB的引用.

In your case, A is a reference to the ObjectA, B is a reference to the ObjectB.

定义Class1 C = A;

• 首先，您创建两件事.名为 ObjectC 的对象和对名为 C 的对象的引用.
• 然后将A的引用复制到C的引用.现在， A和C引用了同一对象.

• First, you create two thing. An object called ObjectC and a reference to the object called C.
• Then you copy reference of A to reference of C. Now, A and C is reference to the same object.

对引用对象使用==时，如果引用的对象相同，则返回true，否则返回false.

When you use == with reference objects, if they reference to the same objets, it returns true, otherwise return false.

在您的情况下，这就是B == A和C == B返回false的原因，但是，如果尝试使用A == C，它将返回true.

In your case, that's why B == A and C == B returns false, but if you tried with A == C, it returns true.

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