但不是解决办法，但有以下两个功能，你至少可以得到一个想法是什么注册：

Not the solution yet, but with the two following functions you can at least get an idea what is registered:

Membership.Provider

Membership.Providers

我没有继承我的MembershipUser类的用户由于某种原因，但我pretty确保我有它一个很好的理由： - ）

I did inherit my User class from MembershipUser for some reason, but I'm pretty sure I had a good reason for it :-)