C# DrawString 怎么设置字间距和行间距

Question

我自己写了一个 方法//自动换行文字
        private Image drawString(Image image,string text,RectangleF rectF,Font font,Brush brush) {
            if (text != string.Empty && text != "" && text != null && image!=null) {
                Graphics g = Graphics.FromImage(image);
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.CompositingQuality = CompositingQuality.HighQuality;
                g.InterpolationMode = InterpolationMode.High;
                g.DrawString(text, font, brush, rectF);
                g.Dispose();
            }            
            return image;
        }怎么才能设置 字间距和行间距？

Answer 1

//设置字符间隔
[DllImport("gdi32.dll")]
public static extern int SetTextCharacterExtra(IntPtr hdc, int nCharExtra);  

Answer 2

//gdi32.dll
原型：int SetTextCharacterExtra(HDC hdc, int nCharExtra);

Answer 3

[DllImport("gdi32.dll")]
public static extern int SetTextCharacterExtra(IntPtr hdc, int nCharExtra);private Image drawString(Image image,string text,RectangleF rectF,Font font,Brush brush,int nCharExtra) 
{
    if (text != string.Empty && text != "" && text != null && image!=null) 
    {
       Graphics g = Graphics.FromImage(image);
       IntPtr hdc = g.GetHdc();
       SetTextCharacterExtra(hdc, nCharExtra);
       g.ReleaseHdc(hdc);
       g.SmoothingMode = SmoothingMode.HighQuality;
       g.CompositingQuality = CompositingQuality.HighQuality;
       g.InterpolationMode = InterpolationMode.High;
       g.DrawString(text, font, brush, rectF);
       g.Dispose();
   }            
   return image;
}