使用mvc4 razor c#连接mysql数据库

嗨，伙计，我已经看到这个错误代码:执行命令定义时发生错误。有关详细信息，请参阅内部异常。在搜索我的文本到数据库..

        private bool IsValidRegisterNewAcct(string acctname, string dispname, string email, string password)
    {
        var crypto = new SimpleCrypto.PBKDF2();
        bool IsValid = false;
        IsValidErrorMessage = "";
        IsValidErrorMessageInt = 0;
        string Newacctname = crypto.Compute(acctname.ToString());
        //try
        //{
            using (var db = new MainDbContext())
            {
                //db.Connection.Open();
                var user = db.user.FirstOrDefault(u => u.AcctNameSalt  == Newacctname);
                //var user = db.osoa_user.FirstOrDefault(u => u.Email == email);
                if (user != null)
                {
                    IsValid = false;
                    //db.Connection.Close();
                    IsValidErrorMessage = "Account Name already Exist!";
                }
                else
                {
                    var InsertNewAcctName = db.osoa_user.CreateObject();
                    InsertNewAcctName.UserId = Convert.ToString( Guid.NewGuid());
                    InsertNewAcctName.AcctName = acctname;
                    InsertNewAcctName.AcctNameSalt = crypto.Compute(acctname);
                    InsertNewAcctName.DisplayName = dispname;
                    InsertNewAcctName.Email = email;
                    InsertNewAcctName.EmailSalt = crypto.Compute(email);
                    InsertNewAcctName.Password = crypto.Compute(password);
                    InsertNewAcctName.PasswordSalt = crypto.Salt;
                    InsertNewAcctName.UserLevel = 2;
                    db.user.AddObject(InsertNewAcctName);
                    db.SaveChanges();
                    //db.Connection.Close();
                    IsValid = true;
                }
            }
        /*
        }
        catch (Exception e)
        {
            IsValidErrorMessageInt = 1;
            IsValidErrorMessage = e.Message + ". Pls. contact your Administrator.";
            IsValid = false;
        }
        */
        return IsValid;
    }

，错误指向以下代码:

var user = db.user.FirstOrDefault(u => u.AcctNameSalt  == Newacctname);

UPDATE关于Inner异常。我不知道给你的是不是正确的…我尝试使用这个代码:

            try
        {
        }
        catch (Exception e)
        {
            IsValidErrorMessageInt = 1;
            IsValidErrorMessage = e.InnerException + ". Pls. contact your Administrator.";
            IsValid = false;
        }

MySql.Data.MySqlClient。MySqlException (0x80004005):未知列Extent1。MySql.Data.MySqlClient.MySqlStream.ReadPacket()在MySql.Data.MySqlClient.NativeDriver.GetResult(Int32&affectedRow Int64&MySql.Data.MySqlClient.Driver. insertedId)gettresult (Int32语句id, Int32&affectedRows Int64&MySql.Data.MySqlClient.Driver. insertedId)在MySql.Data.MySqlClient.MySqlDataReader.NextResult()在MySql.Data.MySqlClient.MySqlCommand. NextResult()MySql.Data.Entity.EFMySqlCommand. ExecuteReader(CommandBehavior行为)。ExecuteDbDataReader(CommandBehavior行为)在System.Data.Common.DbCommand。ExecuteReader(CommandBehavior行为)在System.Data.EntityClient.EntityCommandDefinition。ExecuteStoreCommands(EntityCommand EntityCommand, CommandBehavior行为)