问题
Is there a way to obtain a specific membership provider?
When you make calls to the static Membership methods they query whatever provider you have configured as the defaultProvider. Is it possible to get a reference to a specific provider that is configured in your web.config and query against only that provider?
回答1:
Yes, if you have multiple providers configured in your web.config, you can look them up by name.
MembershipProvider membershipProvider = Membership.Providers["foo"];
来源：https://stackoverflow.com/questions/6707529/get-specific-membership-provider