如何在C#中检查MySQL连接状态

Question

嗨我在C#中连接到MySQL,我需要检查是否打开了SQL连接.如果打开然后做某事或不做某事.我正在尝试下面的代码,但我收到错误.

var sqlCon= new SqlConnection(Properties.Settings.Default.sString);
var mySQLCon= new MySqlConnection(Properties.Settings.Default.dString);
sqlCon.Open();
mySQLCon.Open();
if (sqlCon.State==ConnectionState.Open && mySQLCon.State==ConnectionState.Open)
  {
    MessageBox.Show(@"Connection working.");
  }
else
  {
    MessageBox.Show(@"Please check connection string");
  }

我收到错误mySQLCon.State==ConnectionState.Open 错误是InvalidOperationException 我们如何检查MySQL连接状态.

Answer 1

我认为错误应该在连接字符串中.首先检查您的连接字符串.

如果连接字符串是正确的,还有一些问题尝试如下所示.

var sqlCon= new SqlConnection(Properties.Settings.Default.sString);
var mySQLCon= new MySqlConnection(Properties.Settings.Default.dString);
sqlCon.Open();
mySQLCon.Open();
var temp = mySQLConn.State.ToString();
if (sqlCon.State==ConnectionState.Open && temp=="Open")
 {
   MessageBox.Show(@"Connection working.");
 }
else
 {
  MessageBox.Show(@"Please check connection string");
 }

而@Leri提到的另一件事应该是关闭/处置非托管资源.希望它对你有用.