CODEWITHSUNDEEP
.netwinformsiconsmdi
lc.
lc.

Reputation: 116528

Problem with icon on creating new maximized MDI child form in .NET

I have a .NET 3.5 MDI WinForms application.

I set a a child form's Icon property, and the icon shows up correctly in the top left corner of the form. I then maximize the child form and the icon is still OK.

With the child form still maximized, I open another child window, which automatically comes up maximized. This form's icon is not the one in the Icon property, but the default .NET icon (the one with the blue, red, and yellow squares). However, if I resize the MDI parent form, the icon resets itself and displays properly.

Does anyone have a workaround or know why this happens?

Upvotes: 16

Views: 13884

Answers (9)

Dave Lucre
Dave Lucre

Reputation: 1165

Adding this as the first line in the Form_Load method on the MDI Children works for me:

this.Icon = new Icon(this.Icon, this.Icon.Size);

Upvotes: 2

RickNL
RickNL

Reputation: 41

private void frmChild_Shown(object sender, EventArgs e)
{
    // Work-around for maximized BUG
    this.Icon = this.MdiParent.Icon;
    this.WindowState = FormWindowState.Normal;
    this.WindowState = FormWindowState.Maximized;
}

Upvotes: 4

VisserP
VisserP

Reputation: 21

I found out this will fix the problem as well.

myForm.WindowState = FormWindowState.Normal;
myForm.Show();
myForm.WindowState = FormWindowState.Maximized;

Upvotes: 2

jesus
jesus

Reputation: 11

form.WindowState = FormWindowState.Normal
form.Show()
form.WindowState = FormWindowState.Maximized
form.Show()

Solved my problem!

Upvotes: 1

Tom
Tom

Reputation: 346

A slight modification to Calanus' solution:

    private void MdiBase_Load(object sender, EventArgs e)
    {
        // Fixes bug where loading form maximised in MDI window shows incorrect icon.
        this.Icon = Icon.Clone() as Icon;
    }

This allows you to set the icon at design time (just as you would for other forms), and does not need any hard-coded file or resource accessing.

Upvotes: 12

Drake
Drake

Reputation: 8392

The best workaround that I found to fix this issue is here.

aNewForm.FormBorderStyle = Windows.Forms.FormBorderStyle.FixedDialog
AddHandler aNewForm.SizeChanged, AddressOf Form_SizeChanged

aNewForm.Show()
aNewForm.WindowState = FormWindowState.Maximized

RemoveHandler aNewForm.SizeChanged, AddressOf Form_SizeChanged

the handler

Protected Sub Form_SizeChanged(ByVal sender As Object, ByVal e As EventArgs)

    If WindowState = FormWindowState.Maximized Then
        If FormBorderStyle <> FormBorderStyle.Sizable Then FormBorderStyle = FormBorderStyle.Sizable
    End If

End Sub

Upvotes: 0

Jose Wales
Jose Wales

Reputation: 11

My solution: Leave the MdiChild "ShowIcon" property set to true, assign a 1x1 transparent icon. Problem solved.

Upvotes: 1

open-collar
open-collar

Reputation: 1424

I found that the only solution was to deactivate and then reactivate the MDI child:

document.Show();
// Work-around for error in WinForms that causes MDI children to be loaded with the default .NET icon when opened maximised.
ActivateMdiChild(null);
ActivateMdiChild(document);

This is the solution given in this reply on MSDN forums and it worked for me.

Upvotes: 4

Calanus
Calanus

Reputation: 26317

Right I have found a solution...

The workaround for this is to set the icon again on the load event of the child form as follows:

private void StatsForm_Load(object sender, EventArgs e)
{
    //bug that means you have to set the desired icon again otherwise it reverts to default when child form is maximised
    Icon = new System.Drawing.Icon("research.ico");
}

This does mean that you will have to first add the icon file in question into your VS project/solution and set it to "Copy Always" so that is copied when your solution is built.

HTH Calanus

Upvotes: 9

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