问题:

I would like to set my form to be exactly 300*300 excluding heading and borders.

If I use Size property, it does include these values.

Is there any way how to do it?

回答1:

You have two options, as follows:

To remove heading and borders from a Form, disable the Form's FormBorderStyle property.
Set the interior of the form with the ClientSize property, as follows:
```
this.ClientSize = new Size(300, 300);
```

回答2:

Why not just factor in the size of the border and the title bar?

int BorderWidth = (this.Width – this.ClientSize.Width) /2;
int TitlebarHeight = this.Height – this.ClientSize.Height – 2 * BorderWidth;

I found the formulas here.

回答3:

There is workaround to set proper Size by designer tool: 1. Set FormBorderSize to "None". 2. Set prefered Size (e.g. "300; 300"). 3. Set FormBorderSize to prefered border (additional needed space will be added to Size property automaticly).