什么是C＃中的良好线程单通用模板模式 [英] What's a good threadsafe singleton generic template pattern in C#

问题描述

我有下面的C＃单例模式，有没有改进它的方法吗？

I have the following C# singleton pattern, is there any way of improving it?

    public class Singleton<T> where T : class, new()
    {

        private static object _syncobj = new object();
        private static volatile T _instance = null;
        public static T Instance
        {
            get
            {
                if (_instance == null)
                {
                    lock (_syncobj)
                    {
                        if (_instance == null)
                        {
                            _instance = new T();
                        }
                    }
                }
                return _instance;
            }
        }

        public Singleton()
        { }

    }

preferred使用例子：

Preferred usage example:

class Foo : Singleton<Foo> 
{
}

相关

为一个明显的单身实现.NET？

推荐答案

据乔恩斯基特在实施Singleton模式在C＃中的code你贴实际上被认为是坏code，因为当对ECMA标准CLI检查它的出现打破了。

According to Jon Skeet in Implementing the Singleton Pattern in C# the code you posted is actually considered as bad code, because it appears broken when checked against the ECMA CLI standard.

同时还要注意：每次你实例化你的对象到一个新类型T的，就变成另一个实例;它不会反映在您的原单。

Also watch out: everytime you instantiate your object with a new type of T, it becomes another instance; it doesn't get reflected in your original singleton.

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