ASP.NE 上传文件控件

 protected void Button1_Click(object sender, EventArgs e)
    {
        //if (Request["id"]==null && Request["id"]=="")
        //{
        //    Response.Write(Request["id"]);
        //}

        //return;
        if (this.FileUpload1.HasFile) //判断控件是否有值
        {
            string fileNameA = Path.GetExtension(this.FileUpload1.FileName); // .bmp
            //--
            string fileNameNo = Path.GetFileName(FileUpload1.PostedFile.FileName); //获取文件名和扩展名 //2017-11-24_110128.bmp
            string DirectoryName = Path.GetDirectoryName(FileUpload1.PostedFile.FileName); //获取文件所在目录  //""
            string Extension = Path.GetExtension(FileUpload1.PostedFile.FileName); //获取扩展名  //.bmp
            string fileName = Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName); //获取文件名（不包括扩展名）  //2017-11-24_110128
            string fullPath = Path.GetFullPath(FileUpload1.PostedFile.FileName); //获取文件的绝对路径  //C:\Program Files (x86)\IIS Express\2017-11-24_110128.bmp
            string PathRoot = Path.GetPathRoot(FileUpload1.PostedFile.FileName); //获取文件所在地分区 //""
            //--
            string path = Server.MapPath("upload/"); //C:\Users\Administrator\Desktop\后台练习\后台练习\sys\upload\
            //在上传的同时重命名
            this.FileUpload1.SaveAs(path+Guid.NewGuid()+fileName); //另存为文件
            Response.Write("上传成功!");

        }
        else
        {
            Response.Write("请选择文件");
        }
    }

<div>
<asp:FileUpload ID="FileUpload1" runat="server" />

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" />
</div>