ASP.NETでMySQLデータベースに接続する方法は？

Question

私はこの方法でMySQLを使用してデータベースに接続しようとしましたが、コードを実行するとResponse.Writeはウェブサイトに何も書き込まれません。

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 

using MySql.Data.MySqlClient; 

public partial class _Default : System.Web.UI.Page 
{ 
    private MySqlConnection connection; 
    private string server; 
    private string database; 
    private string uid; 
    private string password; 

    protected void Page_Load(object sender, EventArgs e) 
    { 
     if (!IsPostBack) 
     // if it is not a post back method, page renders for first time 
     { 
      connectdb(); 
     } 
    } 

    private void connectdb() 
    { 
     server = "localhost"; 
     database = "first_db"; 
     uid = "root"; 
     password = ""; 
     string connectionString; 
     connectionString = "SERVER=" + server + ";" + "DATABASE=" + 
      database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";"; 

     connection = new MySqlConnection(connectionString); 

     try 
     { 
      connection.Open(); 
      Console.ReadKey(); 
      Response.Write("connection opened"); 
     } 
     catch (MySqlException ex) 
     { 
      //When handling errors, you can your application's response based 
      //on the error number. 
      //The two most common error numbers when connecting are as follows: 
      //0: Cannot connect to server. 
      //1045: Invalid user name and/or password. 
      switch (ex.Number) 
      { 
       case 0: 
        Response.Write("Cannot connect to server. Contact administrator"); 
        break; 

       case 1045: 
        Response.Write("Invalid username/password, please try again"); 
        break; 
      } 
     } 
    } //end of connectdb 
} 

Answer 1

あなたのコードは多くの例外を抑制しています。

これをswitch文の最後に追加することをお勧めします。

 default: 
       Response.Write(ex.Number + ": " + ex.Message); 
       break; 

あなたはおそらく何が間違っているかを知るでしょう。