Question

private void MMScrpt()
{
    try
    {
       MySqlConnectionStringBuilder connBuilder = new MySqlConnectionStringBuilder();

       connBuilder.Add("Database", databaseMM);
       connBuilder.Add("Data Source", "localhost");
       connBuilder.Add("User Id", "root");
       connBuilder.Add("Password", txtPassword.Text);

       MySqlConnection connection = new MySqlConnection(connBuilder.ConnectionString);
       MySqlCommand cmd = connection.CreateCommand();

       connection.Open();
       progressBar1.Minimum = 0;
       progressBar1.Step = 1;
       progressBar1.Value = 0;

       string MMScript = Properties.Resources.millmancompany;
       string[] tokens = MMScript.Split(';');
       progressBar1.Maximum = tokens.Length;
       for (int i = 0; i < tokens.Length; i++)
       {
           MMtokens = tokens[i];
           cmd.CommandText = MMtokens.ToString();
           cmd.CommandType = CommandType.Text;
           cmd.ExecuteNonQuery();
           progressBar1.PerformStep();
       }
       connection.Close();
       connection.Close();
   }

   catch (Exception ex)
   {
       MessageBox.Show(ex.Message, "Error Message");
   }
}

private void BTNsriptRUN_Click(object sender, EventArgs e)
{

    Thread tr1 = new Thread(new ThreadStart(MMScrpt));

    tr1.Start();
    //MMScrpt();

}

Answer 1

您无法访问线程上的UI控件。您应该使用调度程序，或使用任务来更新UI组件。

例如，添加对windowBase的引用，在启动线程之前保持对当前Dispatcher的引用，并使用它来更新控件：

//Reference to CurrentDispatcher before launching thread:

Dispatcher myDispatcher = Dispatcher.CurrentDispatcher;

myDispatcher.BeginInvoke(new Action(() =>
{
 progressBar1.Minimum = 0;
 progressBar1.Step = 1;
 progressBar1.Value = 0;

 }));

跨线程操作无效：控制''从创建它的线程以外的线程访问

1 个答案: