批量图片格式与尺寸转换

一时失言乱红尘 2022-09-04 12:57 226阅读 0赞

引用 System.Drawing.dll

/// <summary>
               /// 开始转换图片
               /// </summary>
               /// <param name="path">源文件路径(完整路径,包括文件名)</param>
               /// <param name="savePath">生成图片保存路径(包括文件名包括文件名,但不包括文件格式)</param>
               /// <param name="width">新生成图片宽度</param>
               /// <param name="height">新生成图片高度</param>
               /// <param name="format">格式,默认为gif(需生成多种格式,则以"|"隔开,例如"jpg|gif|png")</param>
               /// <returns></returns>
               public static bool Start(string path,string savePath,int width, int height,string format)
               {
                   if (File.Exists(path))
                   {
                    
                       try
                       {
                           Image resimage = Image.FromFile(path);
                           Bitmap bitmap = new Bitmap(resimage, new Size(width, height));
                           ImageFormat[] ilist = GetFormat(format);
                           if (!savePath.EndsWith(".")) savePath += ".";
                           foreach (ImageFormat imgfor in ilist)
                           {
                               string backname = imgfor.ToString().ToLower();
                               if (backname == "jpeg") backname = "jpg";
                               bitmap.Save(savePath + backname, imgfor);
                           }
                           resimage.Dispose();
                           bitmap.Dispose();
                       }
                       catch {
                           return false;
                       }
                       return true;
                   }
                   else
                   {
                       return false;
                   }
               }
    
               /// <summary>
               /// 获取待生成的图片格式列表,可能需要生成多种格式
               /// </summary>
               /// <param name="formats">参数,多种格式以"|"隔开</param>
               /// <returns></returns>
               protected static ImageFormat[] GetFormat(string format)
               {
                   if (string.IsNullOrEmpty(format))
                       format = "gif";
                   else
                       format = format.ToLower();
                   string[] formats = format.Split('|');
    
                   ImageFormat[] formatlist = new ImageFormat[formats.Length];
                   for (int i = 0; i < formats.Length; i++)
                   {
                       switch (formats[i])
                       {
                           case "jpg":
                               formatlist[i] = ImageFormat.Jpeg;
                               break;
                           case "png":
                               formatlist[i] = ImageFormat.Png;
                               break;
                           default:
                               formatlist[i] = ImageFormat.Gif;
                               break;
                       }
                   }
    
                   return formatlist;
               }