TextRenderer.MeasureText存在问题

Question

您好我使用TextRenderer.MeasureText()方法来测量给定字体的文本宽度.我使用Arial Unicode MS字体来测量宽度,这是一种包含所有语言字符的Unicode字体.该方法在不同的服务器上返回不同的宽度.这两台机器都安装了Windows 2003和.net 3.5 SP1.

这是我们使用的代码

using (Graphics g = Graphics.FromImage(new Bitmap(1, 1)))
{                
    width = TextRenderer.MeasureText(g, word, textFont, new Size(5, 5), TextFormatFlags.NoPadding).Width;
}

知道为什么会这样吗？

我使用C#2.0

Answer 1

//--------------------------------------------------------------------------------------
// MeasureText always adds about 1/2 em width of white space on the right,
// even when NoPadding is specified. It returns zero for an empty string.
// To get the precise string width, measure the width of a string containing a
// single period and subtract that from the width of our original string plus a period.
//--------------------------------------------------------------------------------------

public static Size MeasureText(string Text, Font Font) {
  TextFormatFlags flags
    = TextFormatFlags.Left
    | TextFormatFlags.Top
    | TextFormatFlags.NoPadding
    | TextFormatFlags.NoPrefix;
  Size szProposed = new Size(int.MaxValue, int.MaxValue);
  Size sz1 = TextRenderer.MeasureText(".", Font, szProposed, flags);
  Size sz2 = TextRenderer.MeasureText(Text + ".", Font, szProposed, flags);
  return new Size(sz2.Width - sz1.Width, sz2.Height);
}

Answer 2

不知道MeasureText是否准确.

继承人更好的方式:

    protected int _MeasureDisplayStringWidth ( Graphics graphics, string text, Font font )
    {
        if ( text == "" )
            return 0;

        StringFormat format = new StringFormat ( StringFormat.GenericDefault );
        RectangleF rect = new RectangleF ( 0, 0, 1000, 1000 );
        CharacterRange[] ranges = { new CharacterRange ( 0, text.Length ) };
        Region[] regions = new Region[1];

        format.SetMeasurableCharacterRanges ( ranges );
        format.FormatFlags = StringFormatFlags.MeasureTrailingSpaces;

        regions = graphics.MeasureCharacterRanges ( text, font, rect, format );
        rect = regions[0].GetBounds ( graphics );

        return (int)( rect.Right );
    }