Sharing events in Mdi Program and runtime loaded childs

Question

0.00/5 (No votes)

See more:

Hello, I made an mdi program and I load dinamically some child form this way:

Assembly newDll = Assembly.LoadFile("Child_01.exe");
Type type = newDll.GetType("Child.Form1");

Object obj = Activator.CreateInstance(type);
Form child = (Form)Activator.CreateInstance(type);

child.MdiParent = this;
child.WindowState = FormWindowState.Maximized;
child.Show();

In the child forms I would like to send event (for example pushing a button etc)
to the Parent Form.

I tried using an interface but I still can't make the Parent Form to get the rising of the event.

here's the interface example:

namespace EventManager
{
public interface IEventInterface
{
event EventHandler<testargs> TestChanged;
void RaiseEvent(String value);
}

public class TestChangeArgs : EventArgs
{
public TestChangeArgs(String value)
{
ChangeText = value;
}

public String ChangeText { get; private set; }
}
}

Thanks in advance.

Posted 9-Dec-13 5:36am

AngelBlueSky

Add a Solution

Comments

Sergey Alexandrovich Kryukov 9-Dec-13 11:57am

You are trying to do relatively advanced things. This depth (even if you have some problems, let's set them aside for now) is in the great contrast with such a lame as MDI. Do you really want to torture yourself and scare off your users with this unfortunate design element? Even Microsoft takes measure to phase it out and at least discourage. Listen to a good friendly advice: never ever use MDI. You can do much better (and often much easier at the same time)...
—SA

AngelBlueSky 9-Dec-13 14:04pm

You could be right but I can't include all forms as reference as I do with the DockPanel Suite. I need to write an application with a lot of forms. What do you suggest?

Sergey Alexandrovich Kryukov 9-Dec-13 15:10pm

What do you mean "include all forms as reference"? Yes, you can have different options which a much better. Dock Panel suite (which one did you use), TabControl. It depends on expected complexity of your application. I see no reasons at all to keep to MDI...
—SA

AngelBlueSky 10-Dec-13 9:33am

Hi I'll explain with an example project:

I use dockpanel suite to load some new tab, they're dinamically
loaded from external forms (dll or exe) like this:

private void cccToolStripMenuItem_Click(object sender, EventArgs e)
{
Assembly newDll = Assembly.LoadFile(Application.StartupPath + @"\002.exe");
Type type = newDll.GetType("_002.Form1");
object obj = Activator.CreateInstance(type);
Form frm1 = obj as Form;
frm1.TopLevel = false;

DockContent dockContent = new DockContent();
frm1.TopLevel = false;
frm1.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
frm1.Dock = DockStyle.Left;
frm1.Visible = true;
dockContent.ShowHint = WeifenLuo.WinFormsUI.Docking.DockState.DockLeftAutoHide;
dockContent.Text = frm1.Text;
dockContent.Controls.Add(frm1);
dockContent.Show(dockPanel1, WeifenLuo.WinFormsUI.Docking.DockState.DockLeft);
}

I'm doig like this because I've got a lot of them.

The question is: How can I get some event from the dinamically loaded form
into the main (parent) form?

Thanks again

Sergey Alexandrovich Kryukov 10-Dec-13 11:09am

First of all, you are doing a nasty thing by finding a form type by name. Is it really necessary? Where do you get this name?
The best approach is to define some plug-in interface and see if a type implements it (IsAssignableTo...). Now, another problem: you load by Assembly.LoadFile. Do you even need to unload it? If you load more and more assemblies, you would get a memory leak.

Now, is it what you call MDI, your docking system? It does not look quite like MDI. Any link?
—SA

AngelBlueSky 10-Dec-13 15:01pm

I agree with you completly, mine was just an example, I asked about mdi and child loaded runtime just to learn how to get events from them into a parent form using an interface. Anyway I created an interface, inherit it from the child and using the event now I can get events fired by the child. Thank again dude.
Anyway how would you implement an application having a lot of form?

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)