请高手帮我看看一个asp.net图片转换的问题~！！！急！！！！！谢谢！

Question

这个方法是我参考别人的代码写的bmp类型的图片转为gif   可是转换之后图片的后缀还是bmp 请大家帮我看看！  谢谢!// x_imgPath这个是获得的图片路径
//GifPath这个是转换后保存的路径public void UpBmptojpg(string x_imgPath, string GifPath)
    {        System.IO.FileStream stream;
        stream = File.OpenRead(x_imgPath);
        Bitmap bmp = new Bitmap(stream);
        System.Drawing.Image image = bmp;
        System.Drawing.Image newImage = image.GetThumbnailImage(bmp.Width, bmp.Height, null, new IntPtr());
        Graphics g = Graphics.FromImage(newImage);
        g.DrawImage(newImage, 0, 0, newImage.Width, newImage.Height); //将原图画到指定的图上
        g.Dispose();
        stream.Close();
        newImage.Save(GifPath, ImageFormat.Gif);
    }
    }

Answer 1

代码没有问题.
是不是你保存的时候参数GifPath带有.bmp后缀呀?

Answer 2

protected void BtnSave_Click(object sender, EventArgs e)
    {
   
        HttpFileCollection files = HttpContext.Current.Request.Files;
     
       for (int i = 0; i < files.Count; i++)
       {
          
                   HttpPostedFile PostedFile = files[i];                   if (files[i].FileName == "")
                   {
                       Response.Write("<script>alert('你选择的選擇相片"+(i+1)+"不能为空!')</script>");
                       return;
                   }
                   else
                   {
                       string Filename = PostedFile.FileName;
                       string type = Filename.Substring(Filename.LastIndexOf('.'), Filename.Length - PostedFile.FileName.LastIndexOf('.'));
                              string serverpath = Server.MapPath("~/Uploads/Company/ERIC/ImageFiles/") + s + type;
                       if (type == ".bmp")
                       {
                           UpBmptojpg(Filename, serverpath);
                       }
                      
                       if (type == ".jpg" || type == ".gif")
                       {
                           if (PostedFile.ContentLength < 10000)
                           {
                               
                        
                               string x_about = Request.Params["x_about" + (i + 1)];
                              
                               string Img1 = "Uploads/Company/ERIC/ImageFiles/" + s + type;
                               PostedFile.SaveAs(serverpath);
                               int j = b.Insertphotos(X_id, s, x_about, Img1);
                           }
                           else
                           {
                               Response.Write("<script>alert('你选择的上传图片过大!请重新选择')</script>");
                               return;
                           }
                          
                       }
                         
                       else
                       {
                           Response.Write("<script>alert('你选择的上传图片类型不对!请重新选择')</script>");
                           return;
                       }                   }
          
       }
         Response.Write("<script>var isRe=confirm('上传成功！是否继续上传到《" + X_name + "》相册');if(isRe){location.href=location.href;}else{location.href='photob_list2.aspx'}</script>");
    }
    
         public void UpBmptojpg(string x_imgPath, string GifPath)
    {        System.IO.FileStream stream;
        stream = File.OpenRead(x_imgPath);
        Bitmap bmp = new Bitmap(stream);
        System.Drawing.Image image = bmp;
        System.Drawing.Image newImage = image.GetThumbnailImage(bmp.Width, bmp.Height, null, new IntPtr());
        Graphics g = Graphics.FromImage(newImage);
        g.DrawImage(newImage, 0, 0, newImage.Width, newImage.Height); //将原图画到指定的图上
   
        g.Dispose();
        stream.Close();
        newImage.Save(GifPath, ImageFormat.Gif);
    }

Answer 3

  string s = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString(); string serverpath = Server.MapPath("~/Uploads/Company/ERIC/ImageFiles/") + s + type; 可是我的图片要按时间S重命名

Answer 4

请大家多给点见解啊！！！！！！！！就是转换后还要按S当前时间重命名保存到项目的image文件夹中