C# Set ListBox width so that longest item fits

I would like to set my ListBox.Width property so that it is no wider nor narrower than needed, in order to display the items in it. There is a margin of a few pixels between the left of the ListBox and the start of the text - I wou开发者_开发技巧ld like there to be a similar margin on the right. (i.e. there shouldn't be a large gap, and the letters shouldn't be touching the right edge).

Given that I'm not sure how many pixels a given string will be, I'm not sure how to calculate this width.

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I believe you're looking for the MeasureString method of the Graphics class.

Try this:

Graphics graphics = this.createGraphics();
SizeF mySize = graphics.MeasureString("Ahoy there", this.Font);

Hope this helps!

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This may be what you want. Also play around with Integral Height and padding.

http://www.codeproject.com/KB/combobox/resizablelistbox.aspx

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This worked for me, it wasn't until I changed the width of the listbox that I saw the results I wanted. I looped through the items in the listbox to get the longest. Hope this helps.

int LongestItemLength = 0;
for (int i = 0; i < listBox1.Items.Count;i++ ){
    Graphics g = listBox1.CreateGraphics();
    int tempLength = Convert.ToInt32((
            g.MeasureString(
                    listBox1.Items[i].ToString(), 
                    this.listBox1.Font
                )
            ).Width);
    if (tempLength > LongestItemLength){
        LongestItemLength = tempLength;
    }
}
listBox1.Width = LongestItemLength;
listBox1.Show();