Question

我有一个偶尔会执行的WPF应用程序（每隔几天）。它连接到MySQL数据库并在那里转储一些信息。这是我用来连接的代码：

// connection to the database server
public MySqlConnection con;

public Window1()
{
    InitializeComponent();

    //initialize connection variables
    con = new MySqlConnection();
    con.ConnectionString = @"Server = xxx; Database = xxx; Uid = xxx ; Pwd = 'xxx'; charset=utf8;";

}

public bool OpenConnection()
{
    try
    {
        con.Open();
        return true;
    }
    catch (MySqlException ex)
    {
        //logging any error messages here to custom log files
        return false;
    }
}

该应用程序工作好几个月。我没有触及它，除了偶尔运行它之外，它会成功连接到服务器，执行它的工作然后退出，在此过程中关闭连接。

前几天我试图再次运行它，并收到以下错误消息：

MySql.Data.MySqlClient.MySqlException: Reading from the stream has failed. ---> System.IO.IOException: Unable to read data from the transport connection: A non-blocking socket operation could not be completed immediately. ---> System.Net.Sockets.SocketException: A non-blocking socket operation could not be completed immediately
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at MySql.Data.Common.MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.TimedStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.MySqlStream.ReadFully(Stream stream, Byte[] buffer, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.MySqlStream.LoadPacket()
   --- End of inner exception stack trace ---
   at MySql.Data.MySqlClient.MySqlStream.LoadPacket()
   at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
   at MySql.Data.MySqlClient.NativeDriver.Open()
   at MySql.Data.MySqlClient.Driver.Open()
   at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
   at MySql.Data.MySqlClient.MySqlPool.CreateNewPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
   at MySql.Data.MySqlClient.MySqlPool.GetConnection()
   at MySql.Data.MySqlClient.MySqlConnection.Open()

我可以使用phpMyAdmin使用连接字符串中的相同参数成功连接到数据库，我还有一个小型在线Web PHP应用程序，它从同一个数据库中读取数据，并且还成功连接并运行查询。但是，WPF应用程序不再是这种情况，所以任何建议可能是什么问题以及出了什么问题？

P.S。 PHP应用程序使用得更少，因此我认为这不是一个高需求问题，因为除了WPF应用程序之外，没有人实际访问此数据库。此外，我已尝试连续运行3天（白天不同时间），每次都出现同样的错误。

MySqlException：尝试连接数据库时从流中读取失败

0 个答案: