Question

似乎无法捕获MySQL连接器抛出的异常。我故意对连接字符串设置进行配置，当我点击c.Open()时，它会在异常处停止。为什么不被抓住？在该块中使用Throw New Exception()可以按预期工作。

string cString = string.Format( @"server={0};User Id={1};password={2};Persist Security Info=True;database={3}",
                 tbMySQLServer.Text, tbMySQLUser.Text, tbMySQLPw.Text, tbMySQLDB.Text );
MySql.Data.MySqlClient.MySqlConnection c = new MySql.Data.MySqlClient.MySqlConnection( cString );;
try
{
    c.Open();
    tbMySQLTestResult.Text = "Success!";

    if ( cString != Properties.Settings.Default.commvetgenboxConnectionString )
    {
        DialogResult dr = MessageBox.Show( "Would you like to save this new connection string?",
                    "Save?", MessageBoxButtons.YesNo, MessageBoxIcon.Question );

        if ( dr == DialogResult.Yes )
        {
            Properties.Settings.Default.commvetgenboxConnectionString = cString;
            Properties.Settings.Default.Save();
        }
    }
}
catch ( Exception ex )
{
    logger.ErrorException( "Error accessing database", ex );
    MessageBox.Show( "Error opening database./r/nSee log for detailed information./r/n" + ex.Message,
                "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
    tbMySQLTestResult.Text = "Error";
}
finally
{
    if ( c.State == System.Data.ConnectionState.Open )
    {
        c.Close();
    }
}

编辑：当我点击c.Open()时，这是例外：

MySql.Data.MySqlClient.MySqlException occurred
Message=Access denied for user 'ro'@'localhost' (using password: YES)
Source=MySql.Data
ErrorCode=-2147467259
Number=1045
StackTrace:
   at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
InnerException:

Answer 1

绝对是超时问题。根据默认设置等待连接超时，或者显式设置5秒的超时，您应该能够捕获异常。

Answer 2

尝试修改连接字符串。对于MySql，基本格式应该是这样的：

服务器= myServerAddress;数据库= MYDATABASE; UID =名为myUsername; PWD = MYPASSWORD;

Try-Catch在MySQL连接命令中没有按预期工作

2 个答案: