文本轉換爲圖片

 public partial class WebForm3 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ConvertTextFileToImage(Server.MapPath("~/Log.txt"),Server.MapPath("~/Log.png"));  
        }
        void ConvertTextFileToImage(String textFile, String imageFile)
        {
            System.Drawing.Font drawFont = new System.Drawing.Font("宋體", 12);
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(1, 1);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
            String text = System.IO.File.ReadAllText(textFile, Encoding.GetEncoding("GB2312"));
            System.Drawing.SizeF sf = g.MeasureString(text, drawFont, 1024); //設置一個顯示的寬度 
            image = new System.Drawing.Bitmap(image, new System.Drawing.Size(Convert.ToInt32(sf.Width), Convert.ToInt32(sf.Height)));
            g = System.Drawing.Graphics.FromImage(image);
            g.Clear(System.Drawing.Color.White);
            g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
            g.DrawString(text, drawFont, System.Drawing.Brushes.Black, new System.Drawing.RectangleF(new System.Drawing.PointF(0, 0), sf));
            image.Save(imageFile, System.Drawing.Imaging.ImageFormat.Png);
            g.Dispose();
            image.Dispose();
        }
    }