Updating an updatepanel after fileupload: ajax, .net, c#

Updating an updatepanel after fileupload

Asked by: Pichto

Hi all,

I have a question :

On a web page (that i would like to have ajaxed) i put an AJAX upload component which works great.

Now what i want to do is to have on that same page an updatepanel that will display the content of the upload target folder (only images in my case).

Once i load the page, everything works fine : i can see my files and i can upload new files. The problem is that when upload is done, the updatepanel doesn't refresh to reflect changes on the server. How could i make that work ?

Below is my code (ASPX and below, c#)

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="FUA" Namespace="Subgurim.Controles" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Mon test à moi!!</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server"
         EnablePartialRendering="true">
    </asp:ScriptManager>
    <div>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" RenderMode="Block" >
        </asp:UpdatePanel> 
        <cc1:FileUploaderAJAX ID="FileUploaderAJAX1" runat="server" 
                    text_Add="Ajouter" 
                    text_Delete="Effacer" 
                    text_Uploading="Chargement en cours" />
    </div>
    </form>
</body>
</html>
 
C#  :
 
using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using Subgurim.Controles;
using System.IO;
 
public partial class _Default : System.Web.UI.Page 
{
    private String ImageFolder = "~/temp";
    private Int32 ImgPerRow = 8;
 
    protected void Page_Load(object sender, EventArgs e)
    {
        ScriptManager1.RegisterAsyncPostBackControl(FileUploaderAJAX1);
 
        if (FileUploaderAJAX1.IsPosting)
            this.managePost();
 
        if (!Page.IsPostBack)
        {
            GenerateImagesTable();
        }
    }
 
    private void managePost()
    {
        //Response.Write("test");
 
        HttpPostedFileAJAX pf = FileUploaderAJAX1.PostedFile;
 
        if ((pf.ContentType.Equals("image/gif") || pf.ContentType.Equals("image/jpeg") || pf.ContentType.Equals("image/pjpeg")) && pf.ContentLength <= 100 * 1024)
            FileUploaderAJAX1.SaveAs("~/temp", pf.FileName);
 
        
        GenerateImagesTable();
 
        UpdatePanel1.Update();
    }
 
    private void GenerateImagesTable()
    {
        DirectoryInfo dir = new DirectoryInfo(MapPath(ImageFolder));
        FileInfo[] files = dir.GetFiles();
 
        //UpdatePanel1.Controls.Clear();
 
        UpdatePanel1.ContentTemplateContainer.Controls.Clear();
        //PlaceHolder1.Controls.Clear();
 
        if (files.Length == 0)
        {
            UpdatePanel1.ContentTemplateContainer.Controls.Add(new LiteralControl("Pas de fichiers présents dans ce dossier"));
 
            return;
        }
 
        Table ImgTable = new Table();
        TableRow ImgTableRow = new TableRow();
        TableCell ImgTableCell = new TableCell();
 
        UpdatePanel1.ContentTemplateContainer.Controls.Add(ImgTable);
 
        ImgTable.Rows.Add(ImgTableRow);
 
        ImgTable.Width = Unit.Percentage(100);
 
        Int32 i = 0;
        foreach (FileInfo file in files)
        {
            String FileName = file.Name;
            if (i++ == ImgPerRow)
            {
                ImgTableRow = new TableRow();
                ImgTable.Rows.Add(ImgTableRow);
 
                i = 1;
            }
 
            ImgTableCell = new TableCell();
            ImgTableRow.Cells.Add(ImgTableCell);
 
            ImgTableCell.HorizontalAlign = HorizontalAlign.Center;
            ImgTableCell.Width = Unit.Percentage(12.5);
 
            Image myImage = new Image();
            myImage.ImageUrl = ImageFolder + "/" + FileName;
            myImage.Width = Unit.Pixel(50);
            myImage.Height = Unit.Pixel(50);
 
            ImgTableCell.Controls.Add(myImage);
        }
    }
}

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Updating an updatepanel after fileupload

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