[C#]根据字符串长度动态更改标签文本字体大小

private Font GetCorrectFont(Graphics graphic, String   text, Size maxStringSize, Font labelFont)
{
  //based on the Label string,we need to vary font size 
  //current width the text string
  SizeF sizeStr = graphic.MeasureString(text, labelFont);
  Font fontStr = new Font(labelFont.Name,labelFont.Size);
  while (sizeStr.Width > maxStringSize.Width)
  {
    //adjust the font size based on width ratio
    float wRatio = (maxStringSize.Width) / sizeStr.Width;
    //reduce the font size
    float newSize = (int)(fontStr.Size * wRatio); 
 //this creates a new font with given fontfamily name
    fontStr = new Font(labelFont.Name, newSize); 
    sizeStr = graphic.MeasureString(text, fontStr);
   }
   return fontStr;
} 
//Calling convention
//I have a label in my GUI, I need to call this function on "Paint" event 
private void lblIncrease_Paint(object sender, PaintEventArgs e)
{
 lblIncrease.Font =  GetCorrectFont(e.Graphics, lblIncrease.Text, lblIncrease.MaximumSize, lblIncrease.Font);
}