How to inform parent control when UserControl perform method call?

Question

I have MainForm on which i've loaded UserControl. This UserControl has few textboxes and save button. Once i click save, information from textboxes is saved to file. I want to inform MainForm that information is updated to it can reload.

How can i do that ?

score 5 · Accepted Answer · answered Dec 26 '11 at 10:11

5

Use events.

Declare an event in your UserControl, for instance:

public event EventHandler SaveClicked;

then on save click, raise the event:

if (this.SaveClicked != null)
{
    this.SaveClicked(this, EventArgs.Empty);
}

and finally attach a handler in the main form to your event:

...
YourUserControl ctrl = new YourUserControl();
ctrl.SaveClicked += (sender, e) =>
{
    // Put logic of your main form here
};

answered Dec 26 '11 at 10:11

ken2k

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Actually this is not a tricky part. See this discussion: http://stackoverflow.com/questions/786383/c-sharp-events-and-thread-safety – ken2k Dec 26 '11 at 10:25
@ken2k that is highly interesting - I'll delete my original comment, it now seems inaccurate to me (read this in Essential C# 3.0, Michaelis - interesting how the experts can be wrong). – Adam Dec 26 '11 at 10:36

score 1 · Answer 2 · answered Dec 26 '11 at 10:09

1

You can use event - the userControl will send event to the parent - and the parent will register as event listener.

answered Dec 26 '11 at 10:09

Yanshof

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How to inform parent control when UserControl perform method call?

2 Answers2