string str="hello"; Graphics g = Graphics.FromImage(new Bitmap(1, 1)); Font font=new Font("宋體", 9); SizeF sizeF = g.MeasureString(str, font); //測量出字體的高度和寬度 Brush brush; //筆刷,顏色 brush = Brushes.Lime; PointF pf = new PointF(0, 0); Bitmap img = new Bitmap(Convert.ToInt32(sizeF.Width), Convert.ToInt32(sizeF.Height)); g = Graphics.FromImage(img); g.DrawString(str, font, brush, pf); //輸出圖片 MemoryStream ms = new MemoryStream(); img.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); Response.BinaryWrite(ms.ToArray());