创建用户后或创建失败后，再次尝试保存时会多次返回MembershipCreteStatus

Question

我有一个使用WCF和Membership.CreateUser创建新用户的Silverlight Web应用程序。

如果我成功创建了一个用户，然后创建另一个用户，我将两次获得“用户成功创建”状态消息。或者，如果我第一次尝试创建新用户失败，比方说因为用户名已存在，则任何进一步尝试都会多次返回状态消息。

我的WCF服务代码

[OperationContract] 
public MembershipCreateStatus CreateNewUser(string userName, string password, string email, string securityQuestion, string securityAnswer) 
{ 
    MembershipCreateStatus status = new MembershipCreateStatus(); 
    MembershipUser newUser = Membership.CreateUser(userName, password, email, securityQuestion, securityAnswer, true, out status); 

    return status; 
} 

我的方法

tmsClient.CreateNewUserCompleted += new EventHandler<CreateNewUserCompletedEventArgs>(tmsClient_CreateNewUserCompleted); 
tmsClient.CreateNewUserAsync(nu.UserName, nu.Password, nu.Email, nu.SecurityQuestion, nu.SecurityAnswer); 

打电话给我的事件完成

void tmsClient_CreateNewUserCompleted(object sender, CreateNewUserCompletedEventArgs e) 
{ 
    MembershipCreateStatus status = e.Result; 
    string result = GetErrorMessage(status); 
    MessageBox.Show(result); 
} 

最后是GetErrorMessage方法

public string GetErrorMessage(MembershipCreateStatus status) 
{ 
    switch (status) 
    { 
     case MembershipCreateStatus.Success: 
      return "The user was successfully created."; 

     case MembershipCreateStatus.DuplicateUserName: 
      return "Username already exists. Please enter a different user name."; 

     case MembershipCreateStatus.DuplicateEmail: 
      return "A username for that e-mail address already exists. Please enter a different e-mail address."; 

     case MembershipCreateStatus.InvalidPassword: 
      return "The password provided is invalid. Please enter a valid password value."; 

     case MembershipCreateStatus.InvalidEmail: 
      return "The e-mail address provided is invalid. Please check the value and try again."; 

     case MembershipCreateStatus.InvalidAnswer: 
       return "The password retrieval answer provided is invalid. Please check the value and try again."; 

     case MembershipCreateStatus.InvalidQuestion: 
       return "The password retrieval question provided is invalid. Please check the value and try again."; 

     case MembershipCreateStatus.InvalidUserName: 
       return "The user name provided is invalid. Please check the value and try again."; 

     case MembershipCreateStatus.ProviderError: 
      return "The authentication provider returned an error. Please verify your entry and try again. If the problem persists, please contact your system administrator."; 

     case MembershipCreateStatus.UserRejected: 
      return "The user creation request has been canceled. Please verify your entry and try again. If the problem persists, please contact your system administrator."; 

     default: 
      return "An unknown error occurred. Please verify your entry and try again. If the problem persists, please contact your system administrator."; 
    } 
} 

任何想法，为什么发生这种情况？ 的Tx

奥尼尔

Answer 1

我猜你只是调用CreateNewUserAsync方法，然后从来没有将其删除之前添加对CreateNewUserCompleted处理程序。你的tmsClient_CreateNewUserCompleted方法应该看起来像这样才能正常工作：

void tmsClient_CreateNewUserCompleted(object sender, CreateNewUserCompletedEventArgs e) 
{ 
    tmsClient.CreateNewUserCompleted -= new EventHandler<CreateNewUserCompletedEventArgs>(tmsClient_CreateNewUserCompleted); 
    MembershipCreateStatus status = e.Result; 
    string result = GetErrorMessage(status); 
    MessageBox.Show(result); 
}