C＃asp.net Membership.Getuser（）總是爲空

Question

我在激活頁面中有以下代碼，用戶通過電子郵件鏈接激活帳戶。我得到了「newUser.IsApproved = true;」這一行錯誤的「對象引用未設置爲對象的實例」錯誤。 我檢查userId字符串，它得到用戶Id字符串和字符串不empty.Membership.Getuser（）總是得到空，任何人都可以幫助我？

//request for signed user UserId 
    Guid activationCode = new Guid(Request.QueryString["ActivationCode"]); 
    string userId = ""; 

    string ConnectionString = ConfigurationManager.AppSettings["myConnectionString"]; 
    try 
    { 
     using (SqlConnection sqlConnection = new SqlConnection(ConnectionString)) 
     { 
      SqlCommand sqlCommand = new SqlCommand("SELECT user_id FROM ActivationCode WHERE activation_code LIKE '%" + activationCode + "%'", sqlConnection); 
      sqlConnection.Open(); 
      SqlDataReader userIdRdr; 
      userIdRdr = sqlCommand.ExecuteReader(); 
      while (userIdRdr.Read()) 
      { 
       userId = userIdRdr["user_id"].ToString(); 
      } 
      sqlConnection.Close(); 

      MembershipUser newUser = Membership.GetUser(userId); 
      //activate signed user 
      newUser.IsApproved = true; 
      Membership.UpdateUser(newUser); 
     } 
    } 

Answer 1

明白了！

Guid guid = new Guid(userId); 
MembershipUser newUser = Membership.GetUser(guid); 
newUser.IsApproved = true; 
Membership.UpdateUser(newUser);