无法将类型'System.Web.Security.MembershipProvider'隐式转换为'WebMatrix.WebData.ExtendedMembershipProvider'

Question

我的asp.net mvc Web应用程序具有以下插件：-

[HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public ActionResult Login(LoginModel model, string returnUrl)
        {


            ExtendedMembershipProvider domainProvider;

           domainProvider = Membership.Providers["TestDomain1ADMembershipProvider"];

但是我收到以下错误：-

无法将类型'System.Web.Security.MembershipProvider'隐式转换为'WebMatrix.WebData.ExtendedMembershipProvider'。 存在显式转换（您是否缺少演员表？）

Answer 1

错误消息说明了一切：“存在显式转换（您是否缺少演员表？）”：

ExtendedMembershipProvider domainProvider;
domainProvider = (ExtendedMembershipProvider)Membership.Providers["TestDomain1ADMembershipProvider"];