How do I change the windows form size in C#

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I want to change the size of the form programmatically

What I have tried:

C#

var formSize = new System.Drawing.Size(ucTreatmentScreen1.Size.Width + 500, this.ucTreatmentScreen1.Height + 500);
				
				this.MdiParent.ClientSize = formSize;
				this.MdiParent.MaximumSize = formSize;
				this.MdiParent.Size = formSize;
				this.WindowState = FormWindowState.Normal;
				this.ClientSize = formSize;
				this.MaximumSize = formSize;
				base.Width = formSize.Width;
				base.Height = formSize.Height;
				this.Width = formSize.Width;
				this.Height = formSize.Height;

Posted 17-Jan-22 23:15pm

imran zulfiqar 2022

Updated 17-Jan-22 23:44pm

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Comments

Maciej Los 18-Jan-22 5:22am

And... What's wrong with your code? What's the problem?

BillWoodruff 18-Jan-22 8:01am

'base ? what is the context here that makes you use ;base ?

I suggest you set your MDIForm size in its code, then use use the Dock Property to make amy one of child Forms fill it.

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OriginalGriff · Answer 1 · 2022-01-17T23:44:00

If I create a new MDI Parent and an MDI Child forms, then copy'n'paste your code into the child form DoubleClick handler (modified for the UserControl I don't have):

private void ChildForm_DoubleClick(object sender, EventArgs e)
    {
    var formSize = new System.Drawing.Size(500, 500);

    this.MdiParent.ClientSize = formSize;
    this.MdiParent.MaximumSize = formSize;
    this.MdiParent.Size = formSize;
    this.WindowState = FormWindowState.Normal;
    this.ClientSize = formSize;
    this.MaximumSize = formSize;
    base.Width = formSize.Width;
    base.Height = formSize.Height;
    this.Width = formSize.Width;
    this.Height = formSize.Height;
    }

Then it works: the size of both forms is changed as I would expect.
(Even though these two lines are irrelevant):

C#

base.Width = formSize.Width;
base.Height = formSize.Height;

So what am I doing that you aren't? Or you doing that I am not?
How do you test it? What does the debugger show you?