Question

我写了一个单例代码，我相信它不应该工作。它可能觉得它是低级问题，但它会帮助我理解。如果不值得在这里发帖，任何人都可以检查和appolgy。

正在创建两个实例。为什么？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SingletonTest
{


public sealed class Test
{
    private static readonly Test instance = new Test();


    static Test()
    {
    }

    private Test()
    {
    }

    public static Test Instance
    {
        get
        {
            return instance;
        }
    }
    public string Message { get; set; }
}


class Program
{

    static void Main(string[] args)
    {



        var singletonSampleClass = Test.Instance;
        singletonSampleClass.Message = "Hello";
        Console.WriteLine("Singleton class usage: " + singletonSampleClass.Message);


        var singletonSampleClass2 = Test.Instance;
        singletonSampleClass2.Message = "Hello1";
        Console.WriteLine("Singleton class usage: " + singletonSampleClass2.Message);
        Console.Read();
    }
}
}

由于提前。

Answer 1

试试这个：

var singletonSampleClass = Test.Instance; //First reference
singletonSampleClass.Message = "First Change";
Console.WriteLine("Singleton class usage: " + singletonSampleClass.Message);
// Expected to be "Singleton class usage: First Change"

var singletonSampleClass2 = Test.Instance; //Second reference
Console.WriteLine("Singleton class usage: " + singletonSampleClass2.Message);
// Expected to be "Singleton class usage: First Change" aka you have the same instance

singletonSampleClass2.Message = "Second Change";
Console.WriteLine("Singleton class usage: " + singletonSampleClass.Message); //use the first reference
// Expected to be "Singleton class usage: Second Change" even though you changed the instance with the second reference
Console.Read();

你会发现你只有一个实例......你的例子中有2个引用但仍然只有1个实例

单身人士不工作

1 个答案: