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What's the best way to broadcast a custom event from a .Net MDI parent window to it's MDI child forms?

Posted on 2011-02-26
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Last Modified: 2012-05-11
Hi:

I'm working an .Net MDI based application written in C#.

I would like to create a custom event which when broadcasted from the MDI parent would be
received by all MDI child forms. (Much like a custom windows message in pre-.Net days).
The child window would then act on the message if interested.

I know I could brute force this by having a public interface exposed on my subclassed MDI child windows.
From the MDI Parent window, I could then iterate over all the children and call the newly defined/exposed interface.

I figured there must be a more "correct"/"graceful" way to do this.

Thanks,
JohnB
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Question by:jxbma
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2 Comments
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 2000 total points
ID: 34989284
Sure...you declare an event in the MdiParent and then whenever an MdiChild is created you simply subscribe to that event.   When the MdiParent event is raised all subscribers will be notified automatically.

Here's my MdiParent (Form1):
public partial class Form1 : Form
    {

        public delegate void EventSignature(string message);
        public event EventSignature MdiParentEvent;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            this.MdiParentEvent += new EventSignature(f2.MdiChildHandler);
            f2.MdiParent = this;
            f2.Show();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            MdiParentEvent("Listen to your Parents! @" + DateTime.Now.ToString());
        }

    }

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Here's my MdiChild (Form2):  
public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        public void MdiChildHandler(string message)
        {
            this.Text = message;
        }

    }

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0
 
LVL 1

Author Closing Comment

by:jxbma
ID: 34989308
Awesome.
Spot on.
Thanks fore getting back to me so quickly!
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