问题描述
[ThreadStatic] 使用属性定义，而 ThreadLocal<T> 使用泛型.为什么选择不同的设计解决方案?在这种情况下使用泛型优于属性有什么优缺点?
[ThreadStatic] is defined using attribute while ThreadLocal<T> uses generic.
Why different design solutions were chosen?
What are the advantages and disadvantages of using generic over attributes in this case?
推荐答案
评论中提到的博客文章没有明确说明，但我发现非常重要的是，[ThreadStatic] 不会自动为每个线程初始化事物.例如，假设你有这个:
Something the blog post noted in the comments doesn't make explicit, but I find to be very important, is that [ThreadStatic] doesn't automatically initialize things for every thread. For example, say you have this:
[ThreadStatic]
private static int Foo = 42;
使用它的第一个线程将看到 Foo 初始化为 42.但后续线程不会.初始化程序仅适用于第一个线程.所以你最终不得不编写代码来检查它是否已初始化.
The first thread that uses this will see Foo initialized to 42. But subsequent threads will not. The initializer works for the first thread only. So you end up having to write code to check if it's initialized.
ThreadLocal<T> 通过让您提供一个在第一次访问项目之前运行的初始化函数(如 Reed 的博客所示)来解决该问题.
ThreadLocal<T> solves that problem by letting you supply an initialization function (as Reed's blog shows) that's run before the first time the item is accessed.
在我看来，使用 [ThreadStatic] 代替 ThreadLocal<T> 没有任何优势.
In my opinion, there is no advantage to using [ThreadStatic] instead of ThreadLocal<T>.
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