How to Create Directory and File tree in C#

Introduction

In this tips I have given, create directory and file detail as tree view in C#, I have seem so many questions in asked in forums, how to get the  directory and file information in  recursive manner.Hence I have created a simple screen with a treeview and label. Then compose the code to build directory tree.

Implementation

I have created two methods for this operation. First one for build directory tree and second one for files trees.

private void BuildTree(string directpath){DirectoryInfo dirInfo = new DirectoryInfo(directpath);FileSystemInfo[] collectionOfFAndD = dirInfo.GetFileSystemInfos();TreeNode parentnode = null;parentnode = new TreeNode(dirInfo.Name);parentnode.Tag = dirInfo.FullName;this.treeView1.Nodes.Add(parentnode);foreach (FileSystemInfo var in collectionOfFAndD){if (var.Attributes == FileAttributes.Directory){TreeNode node = new TreeNode(var.Name);node.Tag = var.FullName;parentnode.Nodes.Add(node);BuildFileTree(var.FullName, node);}else{TreeNode node = new TreeNode(var.Name);node.Tag = var.FullName;parentnode.Nodes.Add(node);}}}

second method support add files to treeNode.

private void BuildFileTree(string fileName, TreeNode parentnode){DirectoryInfo dirInfo = new DirectoryInfo(fileName);FileSystemInfo[] collectionOfFAndD = dirInfo.GetFileSystemInfos();foreach (FileSystemInfo var in collectionOfFAndD){if (var.Attributes == FileAttributes.Directory){TreeNode node = new TreeNode(var.Name);node.Tag = var.FullName;parentnode.Nodes.Add(node);BuildFileTree(var.FullName, node);}else{TreeNode node = new TreeNode(var.Name);node.Tag = var.FullName;parentnode.Nodes.Add(node);}}}

The call parent method within the form load event to create treeview with directory

private void Form1_Load(object sender, EventArgs e){BuildTree(@"C:\images");}

 now when you are click file node or directory node, you want to know full path and size of the file. so i have added code within after select event for treeview.

private void treeView1_AfterSelect(object sender, TreeViewEventArgs e){FileInfo info = new FileInfo(e.Node.Tag.ToString());if (info.Attributes != FileAttributes.Directory){label1.Text = "Path:" + info.FullName + " \n Size:" + info.Length + " bytes";}else{label1.Text = "Path:" + info.FullName;}}

 When you are select any node in treeview you able to get path and size of the file. i hope this is help to you all.