This code sample shows, in C#, how to get all the files within a specific folder, and list them all, including the file size, in a Gridview control.
To access the FileSystem, you’ll need to import the System.IO namespace, and to use a DataTable, you must import the System.Data namespace:
using System.IO;
using System.Data;
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="_01_Filling_a_Grid_with_Files_in_a_Folder._Default" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div style="text-align:center">
<asp:Label ID="lblHeader" runat="server"></asp:Label>
<asp:GridView ID="grdFiles" runat="server">
</asp:GridView>
</div>
</form>
</body>
</html>
C# code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.IO;
namespace _01_Filling_a_Grid_with_Files_in_a_Folder
{
public partial class _Default : System.Web.UI.Page
{
String FilePath;
protected void Page_Load(object sender, EventArgs e)
{
FilePath = Server.MapPath("~/Files");
GetFiles(); //call the GetFiles method
lblHeader.Text = "Files in " + FilePath;
}
private void GetFiles()
{
//Create the DataTable, with columns in which to add the file list
DataTable dt = new DataTable();
dt.Columns.Add("FileName", typeof(System.String));
dt.Columns.Add("Size", typeof(System.String));
DataRow dr = null;
DirectoryInfo dir = new DirectoryInfo(FilePath);
// Iterate through the datatable,
// adding file to a new row, along with the filesize to each row
foreach (FileInfo fi in dir.GetFiles())
{
dr = dt.NewRow();
dr[0] = fi.Name.ToString();
dr[1] = fi.Length.ToString("N0"); //'N0'formats the number with commas
dt.Rows.Add(dr);
}
// Bind DataTable to GridView - voila!
grdFiles.DataSource = dt;
grdFiles.DataBind();
}
}
}
That’s a smart way of thnkiing about it.