【图片】c#多图片上传并生成缩略图的实例代码-上传-缩略图

欢迎您访问我爱IT技术网，今天小编为你分享的编程技术是：【c#多图片上传并生成缩略图的实例代码】，下面是详细的讲解！

c#多图片上传并生成缩略图的实例代码

  protected void btnPostFile_ServerClick(object sender, EventArgs e)
     {
         string filePath=Server.MapPath("/uploadImg");
         const int size=5242880;
         if (!Directory.Exists(filePath))
         {
             Directory.CreateDirectory(filePath);
         }
         if (Request.Files.Count > 0)
         {
             for (int i=0; i < Request.Files.Count; i++)
             {
                 HttpPostedFile postFile=Request.Files[i];
                 string uploadFileID=string.Format("#upload{0}", i + 1);  //当前的上传控件ID,因为jquery要调用就加了#
                 string msg=null;                 //提示信息
                 if (postFile.FileName.Trim().Length <=0)
                 {
                     continue;
                 }
                 if (postFile.ContentLength > size)
                 {
                     msg="文件太大";
                     Page.ClientScript.RegisterStartupScript(GetType(), "", "ValidImage(" + uploadFileID + "," + msg + ")", true);//将提示信息发送到客户端
                     continue;
                 }
                 string savePath=Path.Combine(filePath, postFile.FileName);        //图片的保存地址
                 if (!File.Exists(savePath))
                 {
                     postFile.SaveAs(Path.Combine(filePath, postFile.FileName));     //如果文件不存在就保存
                 }
                 else
                 {
                     msg="文件" + postFile.FileName + "已经存在";
                     Page.ClientScript.RegisterStartupScript(GetType(), "", "ValidImage(" + uploadFileID + "," + msg + ")", true);//将提示信息发送到客户端
                     continue;
                 }
                 if (IsImg(savePath))            //通过IsImg方法验证文件是否是图片，或者格式是否正确
                 {
                     SmallImg(postFile.InputStream, postFile.FileName);
                 }
                 else
                 {
                     msg="只能上传JGP、PNG类型的图片，请检查文件格式是否正确";
                     Page.ClientScript.RegisterStartupScript(GetType(), "", "ValidImage(" + uploadFileID + "," + msg + ")", true);//将提示信息发送到客户端
                     File.Delete(savePath);  //如果不是图片就删除
                 }
             }
         }
     }

关于c#多图片上传并生成缩略图的实例代码的用户互动如下：

　　相关问题：

　　答： >>详细

　　相关问题：

　　答： >>详细

　　相关问题：

　　答： >>详细