How could iI change value in a windows form from another class?

[Wolf67]

I have create a windows form frmAccount, in the form a have a richtextbox "rtxtLastScan" from the form I call (FileDirectory fd = new FileDirectory();
fd.timer(int.Parse(rtxtSeconds.Text), rtxtAccount.Text, strStartUpPath) another class FileDirectory.cs. From this class i want to set rtxtLastScan´s value, I tried different
ways but nothing seems to work. When i debugg i got down to ScanDirectory() and the code runs tro but the text in frmAccount rtxtLastScan doesn´t change. Could anyone help me?


public class FileDirectory
{

string strStartUpPath = "";
Account myAcc = new Account();
frmAccount myFrmAccount;



public void ScanDirectory()
{

myFrmAccount = new frmAccount();

myFrmAccount.rtxtLastScan.Text = "Hello";


}
}

 

[chiph]

You must not update a WinForm control from a different thread than created the form. This is a Win32 limitation.

Since you're calling it from a timer, and timers run on a threadpool, that means that you're calling it from another thread (bad thing to do).

Write some code in your form like this:

public delegate void ScanEventHandler(object sender, DateTime lastScanTime);
:
:
:
private void UpdateScan(object sender, DateTime lastScanTime)
{
  if (this.InvokeRequired)
  {
    this.BeginInvoke(new ScanEventHandler(UpdateScan),
                    new object[] { sender, lastScanTime } );
    return;
  }

  this.rtxtLastScan.Text = lastScanTime.ToString();
}

This will check to see if you're calling it on the current thread, and if not, do a BeginInvoke to make sure you are on the correct thread, and call back into itself to update the textbox.

Chip H.


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