How to set a child form in centre of parent form?

Question

I'd like to do the same as this:

Show a child form in the centre of Parent form in C#

But at any moment, not only at start.

Reason is because I show and hide a form. So this only work on first show because after that it is just hidden, so I don't "Start" it again.

`if (ParentForm != null) Location = new Point((ParentForm.Size.Width - Size.Width) / 2, (ParentForm.Size.Height - Size.Height) / 2);` — Dmitry Bychenko, Jul 31 '16 at 19:45
thanks, I ended up doing this. You just lack this.Location.X to add to x coordinate and same thing for Y coordinate. If you post it as answer I'll mark it — Cher, Jul 31 '16 at 20:50

score 0 · Answer 1 · answered Jul 31 '16 at 20:05

0

C# code to show subForm in center of this (this form is papa of subForm)

frmSub fs=new frmSub();
fs.StartPosition = FormStartPosition.CenterParent;
fs.Parent = this;
fs.Show();

answered Jul 31 '16 at 20:05

miu píp píp

1
3

this would work but make a new form every time, I need to just show hide it – Cher Jul 31 '16 at 20:07

Raktim Biswas · Answer 2 · 2016-07-31T21:39:45.160

0

Try this and keep the FormBorderStyle of the parent form to FixedSingle so that it's not resizable.

Say, suppose you do this on a button1_Click() event and just declare Form f2 = new Form(); above the event. And set the start position of the child form to CenterScreen like this:

f2.StartPosition = FormStartPosition.CenterScreen;

Using a checkBox you can show/hide the child form easily.

Form f2 = new Form();
private void button1_Click(object sender, EventArgs e)
{
    this.FormBorderStyle = FormBorderStyle.FixedSingle;
    this.IsMdiContainer = true;            
    //Form f2 = new Form(); To prevent creating a new form everytime.
    f2.MdiParent = this;
    f2.StartPosition = FormStartPosition.CenterScreen;
    if (checkBox1.Checked)
        f2.Hide();
    else
        f2.Show();
}

edited Jul 31 '16 at 21:39

answered Jul 31 '16 at 20:06

Raktim Biswas

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this work but make a new form every time, I need to just show hide it – Cher Jul 31 '16 at 20:08
come again...what do you want to hide? – Raktim Biswas Jul 31 '16 at 20:09
form.Hide() instead of closing it so it always remains active. Then form.Show() when I want to show it – Cher Jul 31 '16 at 20:15
hmmm trying it with few tweaks, exactly same code, form just doesn't show – Cher Jul 31 '16 at 20:44

How to set a child form in centre of parent form?

2 Answers2