上传视频和图片的同时，生成缩略图

 

 在web.config中进行修改配置，增加视频上传的最大长度。

<httpRuntime requestValidationMode="2.0" maxRequestLength="4096000" useFullyQualifiedRedirectUrl="true"/>

 进行上传图片，并且生成缩略图

 //进行图片的上传，并且生成缩略图
    protected void Button1_Click(object sender, EventArgs e)
    {
        


            string FileName = Fud_Pic.PostedFile.FileName.Substring(Fud_Pic.PostedFile.FileName.LastIndexOf(@"/") + 1);//获取文件名字，前面的盘符路径省略；
            //获取文件属性
            int start = FileName.LastIndexOf(".");//获取相片名
            String type = FileName.Substring(start); //相片的属性
            string filename1 = DateTime.Now.ToString("yyyyMMddhhmmss") + type;
            string webFilePath = HttpContext.Current.Server.MapPath("~/upfiles/" + filename1);
            string sFilePath = HttpContext.Current.Server.MapPath("~/images/" + filename1);
            Fud_Pic.PostedFile.SaveAs(Server.MapPath("~/upfiles/" + filename1));//进行保存图片
            MakeThumbnail(webFilePath, sFilePath, 130, 130, "H");
      
    }



      public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
        {
            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
            //HttpContext.Current.Response.Write(thumbnailPath);
            int towidth = width;
            int toheight = height;

            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;

            switch (mode)
            {
                case "HW"://指定高宽缩放（可能变形）
                    break;
                case "W"://指定宽，高按比例
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case "H"://指定高，宽按比例
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case "Cut"://指定高宽裁减
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = 0;
                        x = (originalImage.Width - ow) / 2;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = 0;
                        y = (originalImage.Height - oh) / 2;
                    }
                    break;
                case "CutA"://指定高宽裁减（不变形）自定义
                    if (ow <= towidth && oh <= toheight)
                    {
                        x = -(towidth - ow) / 2;
                        y = -(toheight - oh) / 2;
                        ow = towidth;
                        oh = toheight;
                    }
                    else
                    {
                        if (ow > oh)//宽大于高
                        {
                            x = 0;
                            y = -(ow - oh) / 2;
                            oh = ow;
                        }
                        else//高大于宽
                        {
                            y = 0;
                            x = -(oh - ow) / 2;
                            ow = oh;
                        }
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp图片
            System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

            //新建一个画板
            Graphics g = System.Drawing.Graphics.FromImage(bitmap);

            //设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //清空画布并以白色背景色填充
            g.Clear(Color.White);

            //在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);

            try
            {
                //以jpg格式保存缩略图
                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
        }