How do I can call event from usercontrol to main form C#

Question

4.00/5 (1 vote)

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Hi,

I have a userControl and I've buttons there, I'd like to call event click in my main form.

What I have tried:

There is what I've tried, but it doesn't work in form.

UserControl

C#

public event EventHandler ButtonClick;

        protected void Button1_Click(object sender, EventArgs e)
        {
            //bubble the event up to the parent
            if (this.ButtonClick != null)
                this.ButtonClick(this, e);
        }

Form

<pre lang="c#">GameField.ButtonClick += new EventHandler(UserControl_ButtonClick);

        protected void UserControl_ButtonClick(object sender, EventArgs e)
        {
            //handle the event 
        }

I can't see class userControl from main form. It might be cause I've a partial class.

C#

public partial class GameField : UserControl

Posted 27-Sep-17 20:25pm

Member 13423970

Updated 20-Jul-20 13:59pm

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OriginalGriff · Answer 1 · 2017-09-27T22:12:00

Solution 1

See here: Transferring information between two forms, Part 2: Child to Parent[^] - it's based on forms, but it's exactly the same with Controls (Forms are derived from Control anyway!).

Posted 27-Sep-17 22:12pm

OriginalGriff

Member 2524527 · Answer 2 · 2020-07-20T13:59:00

Not quite as simple as parent-child form communication. To detect a size change event from a MouseUp event in a button in the programmatically created user control I added the following code in the user control:

C#

public event EventHandler SizeChanged;

        new protected virtual void OnSizeChanged(EventArgs e)
        {
            EventHandler eh = SizeChanged;
            if (eh != null)
            {
                eh(this, e);
            }
        }

In the button MouseUp I added

private void cmdResize_MouseUp(object sender, MouseEventArgs e)
        {
            ...
            EventArgs ef = new EventArgs();
            ...
            SizeChanged(sender,null);
        }

In the form containing the User Control, the code creating the control was

C#

UserControl.UserControl NewControl = new UserControl.UserControl();
                ...
                UserControl.SizeChanged += new EventHandler(UserControl_SizeChanged);
                ParentForm.Add(UserControl);

and new function

C#

void UserControl_SizeChanged(object sender, EventArgs e)
        {
            ...
        }

is executed whenever there is a MouseUp event in the UserControl button