Local File Access - Building a Local File System TreeView

When a Silverlight application is running with elevated permissions it has access to the local file system.  In previous versions of Silverlight if you wanted to browse the local file system then you couldn't, all you could do was present the user with a OpenFileDialog.

Not anymore, in Silverlight 4 you can access the local file system, read folder and file lists, open, edit and save files.  In this example you will need to be running the Silverlight application in Out of Browser mode.

Also available to view and download is the full Local File Explorer demo.

In this example we use the Liquid TreeView to build a tree structure of the local file system.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.IO;

using Liquid;

namespace LocalFileTree
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            if (App.Current.HasElevatedPermissions)
            {
                fileTree.BuildRoot();
            }
        }

        private void FileTree_Populate(object sender, TreeEventArgs e)
        {
            Node node = (Node)sender;

            if (sender is Tree)
            { // We are populating the root nodes collection
                fileTree.Nodes.Add(new Node(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "My Documents", true, "images/folder.png", "images/folderOpen.png", true));
                fileTree.Nodes[0].Expand();
            }
            else
            { // Otherwise we are populating a node
                PopulateNode(node);
            }
        }

        private void PopulateNode(Node node)
        {
            var folders = Directory.EnumerateDirectories(node.ID);
            var files = Directory.EnumerateFiles(node.ID);
            FileInfo info;
            DirectoryInfo dir;

            foreach (string s in folders)
            {
                dir = new DirectoryInfo(s);
                node.Nodes.Add(new Node(s, dir.Name, true, "images/folder.png", "images/folderOpen.png", true));
            }

            foreach (string s in files)
            {
                info = new FileInfo(s);
                node.Nodes.Add(new Node(s, info.Name, false, "images/" + GetIcon(info.Name)));
            }
        }

        private string GetIcon(string filename)
        {
            string[] split = filename.Split('.');
            string extension = string.Empty;

            if (split.Length > 0)
            {
                extension = split[split.Length - 1].ToLower();
            }

            if (extension != "pdf" && extension != "xls" && extension != "doc" && extension != "gif" && extension != "mp3" &&
                extension != "xlsx" && extension != "docx" && extension != "avi" && extension != "jpg" &&
                extension != "mp4" && extension != "png" && extension != "xml" && extension != "zip")
            {
                extension = "unknown";
            }

            return extension + ".png";
        }
    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

using Liquid;

namespace Menu
{
    public partial class Page : UserControl
    {
        public Page()
        {
            InitializeComponent();
        }

        private void MenuList_ItemSelected(object sender, MenuEventArgs e)
        {
            switch (e.Tag.ToString())
            {
                case "cut":
                    // TODO: Cut functionality
                    break;
                case "copy":
                    // TODO: Copy functionality
                    break;
                default:
                    break;
            }
            popupMenu.Hide();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            popupMenu.Show();
        }
    }
}


Here we use the Liquid TreeView which generates a Populate event when a node needs to be populated for example after it has been expanded.  In the populate event handler we retrieve a list of folders and files for the current node and create the child nodes.

Robert wrote:

Does Liquid TreeView work at Mac OS and Linux OS?

EMILYTINGCHINA wrote:

Hi,

i did try your solution, it works fun in the first time, and it also create an application in the desktop, while when i do some modify of the code( i mean other parts no link with this special button), and debug the app again, while it's not working, the problem is:


when i click the button" install out-of-browser", nothing will pop out to ask me for enable the out-of-broswer.


I'm urgent for the solution, hope u can help me!


Thanks in advance!

Rackell wrote:

hello everyone,

I added the liquid.dll to my silverlight 4 project in order to use the Scroller control, i added it in the references as well as in the xaml code " xmlns:Liquid="clr-namespace:Liquid;assembly=Liquid" "

and i inserted the scroller in my xaml page " <Liquid:Scroller Content="Scroller" Height="60" Margin="81,0,0,407" VerticalAlignment="Bottom" HorizontalAlignment="Left"/>"


but when i try to run my application it throws an the Type 'Scroller' was not found because clr-namespace:Liquid;assembly=Liquid" is an unknown namespace


if anyone can help, i would really appreciate it

thank you

hanisidhom wrote:

Is it possible to navigate in my whole hard drive?


Thanks,

Hani

dan wrote:

Hi pkellner,


You must be running out of browser with elevated permissions to access the local file system.


Thanks!

JAINAAGAM wrote:

This is Best One....!!!!


nj

pkellner wrote:

Is there a special build for the inbrowser support with LiquidFileTree and silverlight 4?

Post your Comments

Robert wrote:

Does Liquid TreeView work at Mac OS and Linux OS?

EMILYTINGCHINA wrote:

Hi,

i did try your solution, it works fun in the first time, and it also create an application in the desktop, while when i do some modify of the code( i mean other parts no link with this special button), and debug the app again, while it's not working, the problem is:


when i click the button" install out-of-browser", nothing will pop out to ask me for enable the out-of-broswer.


I'm urgent for the solution, hope u can help me!


Thanks in advance!

Rackell wrote:

hello everyone,

I added the liquid.dll to my silverlight 4 project in order to use the Scroller control, i added it in the references as well as in the xaml code " xmlns:Liquid="clr-namespace:Liquid;assembly=Liquid" "

and i inserted the scroller in my xaml page " <Liquid:Scroller Content="Scroller" Height="60" Margin="81,0,0,407" VerticalAlignment="Bottom" HorizontalAlignment="Left"/>"


but when i try to run my application it throws an the Type 'Scroller' was not found because clr-namespace:Liquid;assembly=Liquid" is an unknown namespace


if anyone can help, i would really appreciate it

thank you

hanisidhom wrote:

Is it possible to navigate in my whole hard drive?


Thanks,

Hani

dan wrote:

Hi pkellner,


You must be running out of browser with elevated permissions to access the local file system.


Thanks!

JAINAAGAM wrote:

This is Best One....!!!!


nj

pkellner wrote:

Is there a special build for the inbrowser support with LiquidFileTree and silverlight 4?

Post your Comments

 
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