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C# .net 高清压缩图片合并图片方法

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/// <summary>
       /// 合并宽度一样的图片
       /// </summary>
       /// <param name="imgUrls">多张图片，按顺序合并</param>
       /// <param name="mergeImgPath">合成图片的具体地址</param>
       /// <returns></returns>
       public bool MergeImg(List<string> imgUrls, string mergeImgPath)
       {
           imgUrls = imgUrls.OrderBy(c => c, new SemiNumericComparer()).ToList();
           using (var file = File.OpenWrite(mergeImgPath))
           {
               try
               {
                   Image image1 = System.Drawing.Image.FromFile(imgUrls[0]);
                   var width = image1.Width;
                   var height = image1.Height;
 
                   //计算整体
                   for (int i = 1; i < imgUrls.Count(); i++)
                   {
                       using (Image tempImg = System.Drawing.Image.FromFile(imgUrls[i]))
                       {
                           height += tempImg.Height;
                       }
                   }
 
                   using (Bitmap b = new Bitmap(width, height))
                   using (Graphics g = Graphics.FromImage(b))
                   {
                       g.CompositingMode = CompositingMode.SourceCopy;
 
                       //先画第一个图片
                       g.DrawImageUnscaled(image1, 0, 0);
 
                       //目前的高度
                       var currentHeight = image1.Height;
 
                       //画多张图片
                       for (int j = 1; j < imgUrls.Count(); j++)
                       {
                           using (Image currentImg = System.Drawing.Image.FromFile(imgUrls[j]))
                           {
                               g.DrawImageUnscaled(currentImg, 0, currentHeight);
                               currentHeight += currentImg.Height;
                           }
                       }
                       b.Save(file, ImageFormat.Jpeg);
 
                   }
                   return true; ;
               }
               catch (Exception ex)
               {
                   return false;
               }
           }
       }
 
 
 
       /// <summary>
       /// Resize the image to the specified width and height.
       /// </summary>
       /// <param name="imagePath">The image to resize.</param>
       /// <param name="width">The width to resize to.</param>
       /// <param name="height">The height to resize to.</param>
       /// <returns>The resized image.</returns>
       public string ResizeImage(string imagePath, int width, int height)
       {
           if (imagePath.ToLower().Contains(".mp4"))
           {
               return "";
           }
           System.Drawing.Image image = System.Drawing.Image.FromFile(imagePath);
           var destRect = new Rectangle(0, 0, width, height);
           var destImage = new Bitmap(width, height);
 
           destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
 
           using (var graphics = Graphics.FromImage(destImage))
           {
               graphics.CompositingMode = CompositingMode.SourceCopy;
               graphics.CompositingQuality = CompositingQuality.HighQuality;
               graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
               graphics.SmoothingMode = SmoothingMode.HighQuality;
               graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
 
               using (var wrapMode = new ImageAttributes())
               {
                   wrapMode.SetWrapMode(WrapMode.TileFlipXY);
                   graphics.DrawImage(image, destRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
               }
           }
           #region  提高压缩质量
           EncoderParameters ep = new EncoderParameters();
           long[] qy = new long[1];
           qy[0] = 1;//设置压缩的比例1-100，压缩比例越小越好
           EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
           ep.Param[0] = eParam;
           #endregion
 
           #region 设置imgcodeinfo为JPEG
           ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
           ImageCodecInfo jpegICIinfo = null;
           for (int x = 0; x < arrayICI.Length; x++)
           {
               if (arrayICI[x].FormatDescription.Equals("JPEG"))
               {
                   jpegICIinfo = arrayICI[x];
                   break;
               }
           }
           #endregion
           
           var resizeImagePath = string.Empty;
           if (jpegICIinfo != null)
           {
               resizeImagePath = imagePath.Replace("jpg", width + "x" + height + ".jpg");
               destImage.Save(resizeImagePath, jpegICIinfo, ep);
 
           }
           return resizeImagePath;
       }