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Question

我搜索evreywhere並嘗試所有建議，但運行下面的代碼時仍然沒有運氣。請注意，一些代碼已被註釋掉。那只是我嘗試不同的事情。 SqlConnection connection = new SqlConnection（「Data Source = URB900-PC \ SQLEXPRESS; Initial Catalog = usersSQL; Integrated Security = True」）;

 string password = PasswordTextBox.Text; 
     string email  = EmailTextBox.Text; 
     string firstname = FirstNameTextBox.Text; 
     string lastname = SurnameTextBox.Text; 

     //command.Parameters.AddWithValue("@UserName", username); 
     //command.Parameters.AddWithValue("@Password", password); 
     //command.Parameters.AddWithValue("@Email", email); 
     //command.Parameters.AddWithValue("@FirstName", firstname); 
     //command.Parameters.AddWithValue("@LastName", lastname); 

     command.Parameters.Add("@UserName", SqlDbType.VarChar); 
     command.Parameters["@UserName"].Value = username; 

     command.Parameters.Add("@Password", SqlDbType.VarChar); 
     command.Parameters["@Password"].Value = password; 

     command.Parameters.Add("@Email", SqlDbType.VarChar); 
     command.Parameters["@Email"].Value = email; 

     command.Parameters.Add("@FirstName", SqlDbType.VarChar); 
     command.Parameters["@FirstName"].Value = firstname; 

     command.Parameters.Add("@LasttName", SqlDbType.VarChar); 
     command.Parameters["@LasttName"].Value = lastname; 

     SqlCommand command2 = new SqlCommand("INSERT INTO users (UserName, Password, UserEmail, FirstName, LastName)" + 
     "values (@UserName, @Password, @Email, @FirstName, @LastName)", connection); 

     connection.Open(); 
     command2.ExecuteNonQuery(); 
     //command2.ExecuteScalar(); 
     connection.Close(); 

當我運行此，填寫文本框，然後按下按鈕，我得到......

必須聲明標量變量「@用戶」。

任何幫助將不勝感激。謝謝。

Answer 1

這是因爲你的參數連接到command，然後執行不同的command2