字符串的宽度自适应容器
Graphics g = Graphics.FromImage(new Bitmap(1, 1));
SizeF size = g.MeasureString(lblTitle.Text, new Font("宋体", 24 * 0.0625F, FontStyle.Bold));
float oldSize=(800*0.0625F);//1px=0.0625em
float newSize = (0.75F/size.Width )* oldSize;
SizeF size = g.MeasureString(lblTitle.Text, new Font("宋体", 24 * 0.0625F, FontStyle.Bold));
float oldSize=(800*0.0625F);//1px=0.0625em
float newSize = (0.75F/size.Width )* oldSize;
size.Width 的单位是em