How a form can use in KeyUp event of the parent form?

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hello!
I have a problem,First, I have a parent form ("mainForm") and in this there is a KeyUp event(private void MainForm_KeyUp(object sender, KeyEventArgs e))

Second, I have child form(Frm2) than opened by openDialog command,
**Now I need that Frm2 can use in MainForm_KeyUp.**
Really, Frm2 comes to MainForm_KeyUp function, but KeyEventArgs e = Keys.Enter
and not all my numbers.
A comment: the KeyEventArgs Filling up by magnetic Card reader.
This is the code:

C#

private void MainForm_KeyUp(object sender, KeyEventArgs e)
       {
          MessageBox.Show(e.KeyCode.ToString());
          if (e.KeyData == Keys.Enter)
          {
              MessageBox.Show("End");
          }
}

Wheמ I swip the card in the reader from the mainForm, I get : "12345END", but from the Frm2, I get "END". why the KeyEventArgs parameter not have more keys? I have to get "12345END" also from frm2

I'm really thankful for your trial to help!!!
Soh

Posted 20-Apr-15 2:55am

nav571

Updated 20-Apr-15 3:39am

Sergey Alexandrovich Kryukov

v2

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nav571 20-Apr-15 9:14am

No one? :(

Sergey Alexandrovich Kryukov 20-Apr-15 9:46am

What do you mean by "use" in "Frm2 can use in MainForm_KeyUp".
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-04-20T04:07:00

First of all, none of the forms are children here, and your main form is not a parent of your other form.

If you call System.Windows.Forms.Form.ShowDialog, your form is shown in the modal state, so the user is supposed to work only with this form in this application (so, it is not system-modal, you can switch to other applications, activate their windows), cannot invoke events of other forms.

Please see: https://msdn.microsoft.com/en-us/library/system.windows.forms.form.showdialog(v=vs.110).aspx[^].

It is not clear what is it and why "Frm2 comes to MainForm_KeyUp". Here is how it look. You did provide any evidence that MainForm_KeyUp is an event handler added to the invocation list of the KeyUp event instance of any of the forms. This is just suggested by the name of the method, as it looks like an auto-generated code you got from the designer. It does not tell anything by itself; adding a delegate to an invocation list is done using += event operator. And using auto-generated names of methods permanently is against good programming style, as such names violate (good) Microsoft naming conventions.

There is another problem of handling keyboard events on the forms: you probably have some controls which grab keyboard focus, so the KeyDown event is not dispatched to the form itself. If you need assign true to the property Form.KeyPreview and handle the event PreviewKeyDown or override the method OnPreviewKeyDown:
https://msdn.microsoft.com/en-us/library/system.windows.forms.control.previewkeydown(v=vs.110).aspx[^].

https://msdn.microsoft.com/en-us/library/system.windows.forms.control.previewkeydown(v=vs.110).aspx[^],
https://msdn.microsoft.com/en-us/library/system.windows.forms.control.onpreviewkeydown(v=vs.110).aspx[^].

I doubt that handling KeyUp and checking up Enter makes any practical sense at all.

The question is not clear enough; you would need to start with explaining the purpose of what you are doing; so, you can get more help if you further clarify the question.

—SA

Dusara Maulik · Answer 2 · 2015-04-20T03:56:00

Hi,

You need to set KeyUp event as private in parent form.

C#

public void Form1_KeyUp(object sender, KeyEventArgs e)
{
      MessageBox.Show(e.KeyValue.ToString());
}

And in child form you can access this method.

C#

private void Form2_KeyUp(object sender, KeyEventArgs e)
{
            Form1 parentForm = new Form1();

            parentForm = (Form1) this.Owner;

            parentForm.Form1_KeyUp(sender, e);

}

How a form can use in KeyUp event of the parent form?

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