要調用此方法，「Membership.Provider」屬性必須是「ExtendedMembershipProvider」的一個實例。

我遇到了這個錯誤，我無法弄清楚它。我在Chrome通過郵遞員發佈的數據，以我的控制器，達到CreateUserAndAccount方法，並且收到此錯誤：要調用此方法，「Membership.Provider」屬性必須是「ExtendedMembershipProvider」的一個實例。

To call this method, the "Membership.Provider" property must be an instance of "ExtendedMembershipProvider".

這裏是我的控制器：

[System.Web.Http.Authorize] 
[InitializeSimpleMembership] 
public class AccountController : ApiController 
{ 
     // POST: /api/register 
     [System.Web.Http.HttpPost] 
     [System.Web.Http.AllowAnonymous] 
     [ValidateAntiForgeryToken] 
     //public HttpResponseMessage Register(RegisterModel model, string returnUrl) 
     public HttpResponseMessage Register(RegisterModel model) 
     { 
      if (ModelState.IsValid) 
      { 
       // Attempt to register the user 
       try 
       { 
        WebSecurity.CreateUserAndAccount(model.UserName, model.Password); // blows up here 
        WebSecurity.Login(model.UserName, model.Password);

我使用的是相同的「InitializeSimpleMembershipAttribute 「類作爲MVC SPA模板：

{ 
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)] 
    public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute 
    { 
     private static SimpleMembershipInitializer _initializer; 
     private static object _initializerLock = new object(); 
     private static bool _isInitialized; 

     public override void OnActionExecuting(ActionExecutingContext filterContext) 
     { 
      // Ensure ASP.NET Simple Membership is initialized only once per app start 
      LazyInitializer.EnsureInitialized(ref _initializer, ref _isInitialized, ref _initializerLock); 
     } 

     private class SimpleMembershipInitializer 
     { 
      public SimpleMembershipInitializer() 
      { 
       Database.SetInitializer<UsersContext>(null); 

       try 
       { 
        using (var context = new UsersContext()) 
        { 
         if (!context.Database.Exists()) 
         { 
          // Create the SimpleMembership database without Entity Framework migration schema 
          ((IObjectContextAdapter)context).ObjectContext.CreateDatabase(); 
         } 
        } 

        WebSecurity.InitializeDatabaseConnection("DefaultConnection", "UserProfile", "UserId", "UserName", autoCreateTables: true); 
       } 
       catch (Exception ex) 
       { 
        throw new InvalidOperationException("The ASP.NET Simple Membership database could not be initialized. For more information, please see http://go.microsoft.com/fwlink/?LinkId=256588", ex); 
       } 
      } 
     } 
    } 
}

而且在我的web.config我已經啓用simpleMembership：

<add key="enableSimpleMembership" value="true" />

還能有什麼？

編輯：我只是想在這個環節發現提示：

http://insomniacgeek.com/to-call-this-method-the-membership-provider-property-must-be-an-instance-of-extendedmembershipprovider/

而現在我越來越

You must call the "WebSecurity.InitializeDatabaseConnection" method before you call any other method of the "WebSecurity" class. This call should be placed in an _AppStart.cshtml file in the root of your site.

任何建議將真棒。

來源

2013-04-04 SB2055

-1

我發現了這個問題。我在我的InitializeAttribute類中引用System.Web.MVC，它應該是System.Web.Http。

來源

2013-04-04 23:21:42 SB2055

你能解釋一下嗎？當我改變對Http的引用時，它將不再編譯。 Http和MVC中正在引用什麼？ – vbullinger 2013-06-03 14:27:17

@vbullinger檢查您的參考（右鍵單擊>添加參考）並確保system.web.http包含在您的項目中。也看看MSDN文檔，如果你需要更多地瞭解內臟 – SB2055 2013-06-04 00:53:27

真的很糟糕的解釋。 – Kyberias 2014-11-03 13:33:12

要調用此方法，「Membership.Provider」屬性必須是「ExtendedMembershipProvider」的一個實例。

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