我可以嘗試在catch中打開MySQL連接嗎？

Question

我有這樣的方法：

static void DbConnect() 
{ 
    // Connects to the Db using a simplified Connection string. 
    try 
    { 
     mySqlConnect = new MySqlConnection("server=" + Setup_Controller.server + ";uid=root;"); 
     mySqlConnect.Open(); 
    } 
    // If a password is required, tries again using the password provided. 
    catch (MySqlException) 
    { 
     mySqlConnect = new MySqlConnection("server=" + Setup_Controller.server + ";uid=root;password='" + Setup_Controller.password + "';"); 
     mySqlConnect.Open(); 
    } 
} 

但是每次捕獲異常時，它不會加載打開，因爲所造成的第一次嘗試連接當前異常的連接。我開始懷疑這是因爲try/catch不允許程序繼續運行，因爲在運行中存在未處理的異常？

Answer 1

如果您確實想使用此方法，則需要先關閉連接，然後才能再次使用它。

static void DbConnect() 
{ 
    // Connects to the Db using a simplified Connection string. 

    try 
    { 
     mySqlConnect = new MySqlConnection("server=" + Setup_Controller.server + 
     ";uid=root;"); 
     mySqlConnect.Open(); 
    } 
// If a password is required, tries again using the password provided. 
catch (MySqlException) 
{ 

     //make sure connection is close 
    if(mySqlConnection != null) 
      mySqlConnect.Close(); 
} 
/* i don't know what this class looks like but most data class expose some method 
    to see if the connection is still open or close. If there is not an IsOpen check 
    for IsClose or something like this 
*/ 
if(!mySqlConnect.IsOpen()) 
{ 
    try 
    { 

     mySqlConnect = new MySqlConnection("server=" + Setup_Controller.server + 
     ";uid=root;password='" + Setup_Controller.password + "';"); 
     mySqlConnect.Open(); 
    } 
    catch (MySqlException) 
    { 
     //make sure connection is close 
     mySqlConnect.Close(); 
    } 

}