Display Directory Structure using TreeView in C#

Submitted by donbermoy on Tuesday, July 1, 2014 - 10:23.

Today in C#, i will teach you on how to create a program that loads and displays the directory structure of C using the TreeView control in C#. So, now let's start this tutorial! 1. Let's start with creating a Windows Form Application in C# for this tutorial by following the following steps in Microsoft Visual Studio: Go to File, click New Project, and choose Windows Application and named your project as TreeViewDirectory. 2. Next, add only one TreeView1 named TreeView11 to display the contents of C directory structure. You must design your interface like this: design

3. Add Using System.IO to the topmost part of the code tab because we will access the directory.

using System.Diagnostics;
using System;
using System.Windows.Forms;
using System.Collections;
using System.Drawing;
using System.Data;
using System.Collections.Generic;
 
 
using System.IO;

4. Create a method named PopulateTreeView with directoryValue As String and parentNode As TreeNode as parameters. On this, create a try and catch method. In the try method, create an array variable (string) named directoryArray that holds and gets the directory either C or D.

public void PopulateTreeView(string directoryValue, TreeNode parentNode)
                {
                        try
                        {
                                
                                string[] directoryArray = Directory.GetDirectories(directoryValue);
                                

Now, create an If statement that if your computer has obtained a directory this will add all the directory folders to the treeview using For Next Loop.

                                if (directoryArray.Length != 0)
                                {
                                        string currentDirectory = default(string);
                                        
                                        foreach (string tempLoopVar_currentDirectory in directoryArray)
                                        {
                                                currentDirectory = tempLoopVar_currentDirectory;
                                                TreeNode myNode = new TreeNode(currentDirectory);
                                                parentNode.Nodes.Add(myNode);
                                        }
                                        
                                }
                        }

In the catch method, put this code below to handle UnauthorizedAccessException and will prompt the user "Access Denied".

                        catch (UnauthorizedAccessException)
                        {
                                parentNode.Nodes.Add("Access Denied");
                        }

5. Add this code for the form_load of your program. This will load the C directory structure using the PopulateTreeView method that we have created above.

                public void Form1_Load(System.Object sender, System.EventArgs e)
                {
                        TreeView1.Nodes.Add("C:");
                        PopulateTreeView("C:\\", TreeView1.Nodes[0]);
                }
                pub

Full source code:

using System.Diagnostics;
using System;
using System.Windows.Forms;
using System.Collections;
using System.Drawing;
using System.Data;
using System.Collections.Generic;
 
 
using System.IO;
 
namespace TreeViewDirectory
{
        public partial class Form1
        {
                public Form1()
                {
                        InitializeComponent();
                        
                }
 
                
                public void Form1_Load(System.Object sender, System.EventArgs e)
                {
                        TreeView1.Nodes.Add("C:");
                        PopulateTreeView("C:\\", TreeView1.Nodes[0]);
                }
                public void PopulateTreeView(string directoryValue, TreeNode parentNode)
                {
                        try
                        {
                                
                                string[] directoryArray = Directory.GetDirectories(directoryValue);
                                
                                if (directoryArray.Length != 0)
                                {
                                        string currentDirectory = default(string);
                                        
                                        foreach (string tempLoopVar_currentDirectory in directoryArray)
                                        {
                                                currentDirectory = tempLoopVar_currentDirectory;
                                                TreeNode myNode = new TreeNode(currentDirectory);
                                                parentNode.Nodes.Add(myNode);
                                        }
                                        
                                }
                        }
                        catch (UnauthorizedAccessException)
                        {
                                parentNode.Nodes.Add("Access Denied");
                        }
                }
        }
        
}

For more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below. Best Regards, Engr. Lyndon Bermoy IT Instructor/System Developer/Android Developer/Freelance Programmer If you have some queries, feel free to contact the number or e-mail below. Mobile: 09488225971 Landline: 826-9296 E-mail:[email protected] Add and Follow me on Facebook: https://www.facebook.com/donzzsky Visit and like my page on Facebook at: https://www.facebook.com/BermzISware

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