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public void AddWaterText(string oldpath, string text, string newpath, object point, System.Drawing.Font font, System.Drawing.Color color, float rotate = 0.0f, int textWidth = 1,int textHeight=1, int repeatD=0)

        {

            try

            {

                FileStream fs = new FileStream(oldpath, FileMode.Open);

                BinaryReader br = new BinaryReader(fs);

                byte[] bytes = br.ReadBytes((int)fs.Length);

                br.Close();

                fs.Close();

                MemoryStream ms = new MemoryStream(bytes);

                System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms);

                int imgPhotoWidth = imgPhoto.Width;

                int imgPhotoHeight = imgPhoto.Height;

                Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);

                bmPhoto.SetResolution(72, 72);

                Graphics gbmPhoto = Graphics.FromImage(bmPhoto);

                gbmPhoto.Clear(Color.FromName("white"));

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

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

                gbmPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight), 0, 0, imgPhotoWidth, imgPhotoHeight, GraphicsUnit.Pixel);

                System.Drawing.SizeF crSize = new SizeF();

                crSize = gbmPhoto.MeasureString(text, font);

                float y = imgPhotoHeight - crSize.Height;

                float x = imgPhotoWidth - crSize.Width;

                System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat();

                StrFormat.Alignment = System.Drawing.StringAlignment.Center;

                if(point!=null)

                {

                    System.Drawing.Point newpos=((System.Drawing.Point)point);

                    x=newpos.X;

                    y=newpos.Y;

                }

                System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(color);

                System.Drawing.Color.FromArgb(1,1,1,1);

                gbmPhoto.RotateTransform(rotate);

                if (repeatD == 0)

                {

                    gbmPhoto.DrawString(text, font, semiTransBrush, x, y);

                }

                else

                {

                    int xcount = imgPhotoWidth/textWidth+3;

                    int ycount = imgPhotoHeight/textHeight+3;

                    float ox = x;

                    for (int k = 0; k < ycount; k++)

                    {

                        for (int i = 0; i < xcount; i++)

                        {

                            for (int j = 0; j < xcount; j++)

                            {

                                gbmPhoto.DrawString(text, font, semiTransBrush, x, y);

                            }

                            x += textWidth+repeatD;

                        }

                        x = ox;

                        y += textHeight+repeatD;

                    }

                }

                bmPhoto.Save(newpath, System.Drawing.Imaging.ImageFormat.Jpeg);

                gbmPhoto.Dispose();

                imgPhoto.Dispose();

                bmPhoto.Dispose();

            }

            catch

            {              

                ;              

            }

        }

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//获取源图片文件路径

string tempfile=Request.PhysicalApplicationPath+"\\app_data\\test.jpg";

//设置文字位置

System.Drawing.Point point = new System.Drawing.Point();

point.X = -10;

point.Y = -100;

//设置字体类

System.Drawing.Font font = new System.Drawing.Font("微软雅黑", 19, System.Drawing.FontStyle.Bold);

//设置字体滤镜值 ，和RGB分量颜色

int alpha = 25; int r = 255; int g = 0; int b = 255;

System.Drawing.Color color = System.Drawing.Color.FromArgb(alpha, r, g, b);

float rotate=30.0f; // 旋转角度

int textWidth = 100; //文本预估宽度

int textHeight=30; //文本预估高度

int repeatD=100; // 多水印文本间距,则表示多水印输出

//添加水印文字

string text="版权所有";

AddWaterText(tempfile,text,tempfile, point, font, color,rotate,textWidth,textHeight,repeatD);

File.Delete(tempfile);  //删除释放文件，在些之前可执行显示操作，如获取base64编码