我可以尝试在catch中打开MySQL连接吗？

Question

我有这样的方法：

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(); 
    } 
} 

但是每次捕获异常时，它不会加载打开，因为所造成的第一次尝试连接当前异常的连接。我开始怀疑这是因为try/catch不允许程序继续运行，因为在运行中存在未处理的异常？

Answer 1

如果您确实想使用此方法，则需要先关闭连接，然后才能再次使用它。

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(); 
    } 

}