C#往图片上面添加文字

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//C#往图片上面添加文字
string dir = System.Environment.CurrentDirectory + "\\html5\\PersonImg\\" + imagename + ".png";
if (File.Exists(dir))
{
    FileStream fs = new FileStream(dir, FileMode.Open, FileAccess.Read,                         
    FileShare.ReadWrite);
    byte[] bytes = new byte[fs.Length];
    fs.Read(bytes, 0, bytes.Length);
    fs.Close();
    MemoryStream ms = new MemoryStream(bytes);
    Bitmap img = new Bitmap(ms);

    Graphics g = Graphics.FromImage(img);
    String str = DateTime.Now.ToString("f");
    Font font = new Font("微软雅黑", 25);
    SolidBrush sbrush = new SolidBrush(System.Drawing.Color.Black);
    g.DrawString(str, font, sbrush, new PointF(1300, 30));
    img.Save(dir, System.Drawing.Imaging.ImageFormat.Png);
}
//C#往图片上面添加文字