C# Override an Event in Winforms [closed]

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Closed 2 years ago.

I need to add an Event for all my Textboxes in a C# winforms app.

How can I override for example, the Enter event so all textboxes will have by default this event ? Thanks in advance

回答1:

You can inherit YourTextBox from TextBox and override OnEnter method to provide default behavior for all such textboxes. Then use this control instead of default TextBox controls:

public class YourTextBox : TextBox
{
    protected override void OnEnter(EventArgs e)
    {
        // do something here
        base.OnEnter(e);
    }
}

Or you can subscribe all textboxes to same event handler. You can do that either manually, or programmatically. E.g. if you are interested only in top-level textboxes of Form:

foreach (var textBox in Controls.OfType<TextBox>())
     textBox.Enter += YourEventHandler;

来源：https://stackoverflow.com/questions/43668106/c-sharp-override-an-event-in-winforms