How do I set the size of the visible area of a form, minus heading and borders?

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).

来源：https://stackoverflow.com/questions/5106546/how-do-i-set-the-size-of-the-visible-area-of-a-form-minus-heading-and-borders