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Get the List of All Files From Server Directory in ASP.Net

This article describes how to get the list of all files from a server folder or directory with a download link option in DataList control.

Suppose you have a folder or directory in your ASP.NET server application and you want to show all the files in that directory on the web page with a download link and allow the user to delete files from the server.

Here I will get all the fields from the server directory and display them in the DataList control with an image icon, download link and a delete option. This will work with any type of extension file.

HTML Markup for the UI

Here, I use an ASP.NET DataList control to display the files from the server directory.

  1. <body>  
  2.     <form id="form1" runat="server">  
  3.     <asp:FileUpload ID="FileUpload1" runat="server" />  
  4.     <asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="UploadFile" />  
  5.     <div style="border: solid 1px #D9DCEA; border-top: none; width: 40%; margin-top: -1px;  
  6.         float: right">  
  7.         <div style="border-top: none; width: 97%; padding: 5px;">  
  8.             <asp:DataList ID="DataListContent" runat="server" OnItemCommand="ButtonDownloadContent"  
  9.                 RepeatDirection="Vertical" BorderStyle="None" Style="padding: 0px!important">  
  10.                 <ItemTemplate>  
  11.                     <div>  
  12.                         <img src='<%# DataBinder.Eval(Container.DataItem,"Icon") %>' id="ImgIcon" />  
  13.                         <asp:LinkButton ID="ButtonDownload" runat="server" Style="padding-left: 5px; text-decoration: none"  
  14.                             ToolTip="Click here to download" CommandName="Download" CommandArgument='<%# DataBinder.Eval(Container.DataItem,"DownLoadLink") %>'  
  15.                             Text=' <%# DataBinder.Eval(Container.DataItem,"FileName") %>'></asp:LinkButton>  
  16.                         <asp:LinkButton ID="lnkDelete" Text="Delete" CommandArgument='<%# Eval("DownLoadLink") %>'  
  17.                             Style="text-decoration: none; font-size: large; color: red;" runat="server" OnClick="DeleteFile" />  
  18.                     </div>  
  19.                 </ItemTemplate>  
  20.             </asp:DataList>  
  21.         </div>  
  22.     </div>  
  23.     </form>  
  24. </body> 

Getting files from directory.

Here I get all the files from the directory to show in the DataList control.

  1. private void GenerateDownloadLinks()  
  2. {  
  3.     string path = Server.MapPath("~/UploadFile");  
  4.     if (Directory.Exists(path))  
  5.     {  
  6.         DataTable ShowContent = new DataTable();  
  7.         ShowContent.Columns.Add("Icon", typeof(string));  
  8.         ShowContent.Columns.Add("DownloadLink", typeof(string));  
  9.         ShowContent.Columns.Add("FileName", typeof(string));  
  10.         DirectoryInfo di = new DirectoryInfo(path);  
  11.         foreach (FileInfo fi in di.GetFiles())  
  12.         {  
  13.             DataRow dr = ShowContent.NewRow();  
  14.             dr["FileName"] = fi.Name; ;  
  15.             dr["DownloadLink"] = Server.MapPath("~/UploadFile/") + fi.Name;  
  16.             string ext = Path.GetExtension(fi.FullName);  
  17.             switch (ext)  
  18.             {  
  19.                 case "png":  
  20.                     dr["Icon"] = ResolveUrl("~/images/PdfIcon.png");  
  21.                     break;  
  22.                 case "doc":  
  23.                     dr["Icon"] = ResolveUrl("~/images/DocIcon.png");  
  24.                     break;  
  25.                 case "xls":  
  26.                     dr["Icon"] = ResolveUrl("~/images/ExcelIcon.png");  
  27.                     break;  
  28.                 case "txt":  
  29.                     dr["Icon"] = ResolveUrl("~/images/TxtIcon.png");  
  30.                     break;  
  31.                 case "zip":  
  32.                     dr["Icon"] = ResolveUrl("~/images/ZipIcon.png");  
  33.                     break;  
  34.             }  
  35.             DataListContent.DataSource = ShowContent;  
  36.             DataListContent.DataBind();  
  37.         }  
  38.     }  
  39. } 

Code for downloading the file:

  1. protected void ButtonDownloadContent(object sender, DataListCommandEventArgs e)  
  2. {  
  3.     if (e.CommandName == "Download")  
  4.     {  
  5.         string path = e.CommandArgument.ToString();  
  6.         string name = Path.GetFileName(path);  
  7.         string ext = Path.GetExtension(path);  
  8.         Response.AppendHeader("content-disposition", "attachment; filename=" + name);  
  9.         Response.ContentType = "application/octet-stream";  
  10.         Response.WriteFile(path);  
  11.         Response.End();  
  12.     }  
  13. }
Code for deleting a file from the directory:
  1. protected void DeleteFile(object sender, EventArgs e)  
  2. {  
  3.     string filePath = (sender as LinkButton).CommandArgument;  
  4.     File.Delete(filePath);  
  5.     GenerateDownloadLinks();  
  6. }

Code for uploading a file from the directory:

  1. protected void UploadFile(object sender, EventArgs e)  
  2. {  
  3.     string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);  
  4.     FileUpload1.PostedFile.SaveAs(Server.MapPath("~/UploadFile/") + fileName);  
  5.     Response.Redirect(Request.Url.AbsoluteUri);  
  6. }

download-file-in-asp.net.png


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