Bitmap bitmap = new Bitmap(image);

                     int degree = ;

                     //图片的宽度与高度

                     int width = bitmap.Width, height = bitmap.Height;

                     //水印文字

                     string text = string.Format("仅供“{0}”使用", projectName);

                     Graphics g = Graphics.FromImage(bitmap);

                     g.DrawImage(bitmap, , );

                     g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

                     g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

                     g.DrawImage(image, new Rectangle(, , width, height), , , width, height, GraphicsUnit.Pixel);

                     Font crFont = new Font("微软雅黑", , FontStyle.Bold);

                     SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(, , , ));

                     //将原点移动 到图片中点

                     g.TranslateTransform(, height);

                     //以原点为中心 转 -45度

                     g.RotateTransform(-);

                     for (int i = ; i < ; i++)

                     {

                         g.DrawString(text, crFont, semiTransBrush, new PointF( - i * ,  + i * ));

                         g.DrawString(text, crFont, semiTransBrush, new PointF( - i * ,  + i * ));

                         g.DrawString(text, crFont, semiTransBrush, new PointF( - i * ,  + i * ));

                     }

                     //保存文件

                     bitmap.Save(sImgPath, ImageFormat.Jpeg);

                     return sImgPath;