Singleton模式的C＃ [英] Singleton Pattern for C#

问题描述

我需要存储一堆需要进行全局访问，我想知道，如果一个单例模式将适用变量。从我所看到的例子，一个单件模式就是这样不能被继承静态类。但我见过的例子是适合我的需要过于复杂。这将是非常简单的单身类？我不能只是做一个静态的，密封类里面一些变量？

I need to store a bunch of variables that need to be accessed globally and I'm wondering if a singleton pattern would be applicable. From the examples I've seen, a singleton pattern is just a static class that can't be inherited. But the examples I've seen are overly complex for my needs. What would be the very simplest singleton class? Couldn't I just make a static, sealed class with some variables inside?

推荐答案

通常一个单身的不是的静态类 - 单身会给你一个单一的实例的一类。

Typically a singleton isn't a static class - a singleton will give you a single instance of a class.

我不知道你的例子已经看到，但通常单件模式可以在C＃中非常简单：

I don't know what examples you've seen, but usually the singleton pattern can be really simple in C#:

public sealed class Singleton
{
    private static readonly Singleton instance = new Singleton();
    static Singleton() {} // Make sure it's truly lazy
    private Singleton() {} // Prevent instantiation outside

    public static Singleton Instance { get { return instance; }
}

这并不困难。

单身过静态成员的优点是类可以实现接口等。有时这是有用的 - 但其他时候，静态成员确实会做的一样好。此外，它通常是以后更容易从一个单身移动到非单，例如通过在单作为配置对象的依赖类，而不是那些依赖类进行直接的静态调用。

The advantage of a singleton over static members is that the class can implement interfaces etc. Sometimes that's useful - but other times, static members would indeed do just as well. Additionally, it's usually easier to move from a singleton to a non-singleton later, e.g. passing in the singleton as a "configuration" object to dependency classes, rather than those dependency classes making direct static calls.

我个人会尽量避免使用单身尽可能 - 他们使测试更加努力，二话不说。他们可以偶尔是有用的，但。

Personally I'd try to avoid using singletons where possible - they make testing harder, apart from anything else. They can occasionally be useful though.

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