在MdiChild表单的Ctrl + S上调用MdiParent方法

Question

I have an mdiParent form in which i have a save method. Now I want that whenever i press Ctrl+S in my activeMdiChild form the parents Save method should get called. Any hint or suggestion is welcome.

Thanx in advance.

Answer 1

Handle the KeyDown event in activeMdiChild .

private void activeMdiChild _KeyDown(object sender, KeyEventArgs e) {
   if (e.KeyCode == Keys.S && e.Modifiers == Keys.Control)
        {
          dynamic parent = this.Parent;
          parent.Save();
        } 
}

EDIT: as mentioned in comments, mdiParent.Save must be public

Answer 2

If you have a MenuStrip in the MDI Parent Form, then you don't need to do anything else than adding a menu with the Ctrl + S shortcut. Then if the user press those combination even in child form, the code for that menu of parent will execute.

But if you don't want to add a menu, then you can override ProcessCmdKey in the "MDI Parent Form" and check if the Ctrl + S combination was pressed, then perform the desired action:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if (keyData == (Keys.Control | Keys.S))
    {
        MessageBox.Show("Handled in main form.");
        return true;
    }
    return base.ProcessCmdKey(ref msg, keyData);
}

The ProcessCmdKey method overrides the base ContainerControl.ProcessCmdKey implementation to provide additional handling of main menu command keys and MDI accelerators.

Answer 3

One of possible solutions:
1. Create an interface
ISave { void Save(); }
2. Let your parent form inherit interface
3. In your child form check for ctrl + s if so do
ISave saver = this.Parent as ISave; if(saver != null) saver.Save();
That's all