ASP.net C＃中的此静态变量线程安全吗？

Question

I know this kind of thing has been asked many times on here but I'm still not completely understanding thread safety in ASP.

C#: Where Util is a static class and theList is a static List.

Util.theList= new List<Object>();
 Util.theList.Add(someObject);

The page loads once, then a second later(1 SECOND AFTER POSTBACK) the Util.theList is populated and the page is reloaded to bind with newly populated list data:

this.Repeater.DataSource = Util.theList;
            this.Repeater.DataBind();

Each time theList is populated it is INSTANTIATED:

Util.theList= new List<Object>(); 

If this is not thread safe how can I make it thread safe? I can't have the list non static and on the same page because of a separate problem where the data only binds each time if it is bound on page_load: OnDataBind only fires on first postback

Answer 1

It is clearly unsafe because static variables are shared between requests. Move the list to some place that is unique to a particular request, like a page instance field.

If you need to pass state across postbacks use ViewState or some other non-global mechanism.

Answer 2

Its best if you avoid static variables all together. Static variables do not really fit well with unit testing. Static classes and variables cannot be stubbed or mocked.

However, in your instance, no the static variables are not thread safe.