Textbox exception with timer

I have a problem with this code.

It's generates this exception:

Text' threw an exception of type 'Microsoft.VisualStudio.Debugger.Runtime.CrossThreadMessagingException

private void Form1_Load(object sender, EventArgs e)
{ 
    Timer = new System.Threading.Timer(
        TimerTick, null, TimeSpan.Zero, new TimeSpan(0, refresh , 0));
}

void TimerTick(object state)
{
    LoggerTxt.AppendText("fsjda开发者_Python百科ò");

 }

LoggerTxt is a TextBox.

How I can do?

thanks

You can access GUI components in a Windows Forms application only from within the foreground thread. (I think, this is also true for WPF applications)

Since you are trying to call a function on the TextBox (a GUI component) from the timer function (in the background thread) you get the exception.

Try

LoggerTxt.Invoke( 
    new MethodInvoker( 
        delegate { LoggerTxt.AppendText("fsjdaò"); } ) );

To avoid the exception.

Also see the documentation of Control.Invoke for more on this topic and this similar SO posting.

As Uwe has commented you cannot access or modify a GUI component not on the GUI thread therefore you have to usually invoke this.

If you are going to do this a lot why not add this class to your projects so that all control objects have this method exposed to them.

You can use LoggerTxt.RunInGUIThread(x => x.AppendText("fsjdao"));

public static class ControlExtensions

{

  public static void RunInGUIThread<TControl>(this TControl control, Action<TControl> action)

    where TControl: Control

  {

    if (control.InvokeRequired)

      control.Invoke(action, control);

    else

      action(control);

  }

}