什么时候在 C# 中初始化静态变量? [英] When do static variables get initialized in C#?
问题描述
我想知道静态变量(在类中)什么时候出现(初始化)?是在第一次调用实例构造函数之后还是在类加载之后?类加载何时发生?
I was wondering about when does a static variable(in a class) come into picture(initialized)? Is it after the instance constructor called for the first time or after the class loads? When does a class loading occur?
推荐答案
哦，那很复杂.这取决于是否设置了 beforefieldinit 标志，而后者(在 C# 中)取决于是否存在静态构造函数.更糟的是；在 .NET 4 中我相信行为发生了变化，使其比以前更懒惰".
Oh, that is complex. It depends on whether the beforefieldinit flag is set, which in turn (in C#) depends on whether there is a static constructor. And worse; in .NET 4 I believe the behaviour changed to make it more "lazy" than it used to be.
坦率地说，我不会在这里编写任何特定行为；简单地说:静态字段将在您尝试使用它们之前进行初始化，只要您使用常规代码来访问它们即可.
Frankly, I wouldn't code to any specific behaviour here; simply: static fields will be initialized before you try to use them, as long as you use regular code to access them.
Jon Skeet has a good write-up on this here and here
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