DouKaku?

//http://ja.doukaku.org/
//http://ja.doukaku.org/102/投稿用
using System;
using System.Windows.Forms;

namespace どう書く_orgフォルダパス一覧のツリー構造への変換 {
    class Program {
        [STAThread]
        static void Main(string[] args) {
            Application.Run(new Form1());
        }
    }

    class Form1:Form {
        //treeView1
        TreeView treeView1 = new TreeView();

        //起動時引数でパス一覧のファイルを指定
        string pathListFilePath = System.Environment.GetCommandLineArgs()[1];

        public Form1() {
            //Form1
            this.Load += new EventHandler(Form1_Load);
            //treeView1
            treeView1.Parent = this;
            treeView1.Dock = DockStyle.Fill;
        }

        void Form1_Load(object sender, EventArgs e) {
            //ROOTNode
            TreeNode rootNode = new TreeNode("ROOT");
            treeView1.Nodes.Add(rootNode);

            foreach(string fullPath in System.IO.File.ReadAllLines(pathListFilePath)) {
                TreeNode addNode = rootNode;
                foreach(string path in fullPath.Split(new char[] { '\\' })) {
                    bool flag = true;
                    foreach(TreeNode node in addNode.Nodes) {
                        if(node.Text == path) {
                            addNode = node;
                            flag = false;
                        }
                        
                    }
                    if(flag) {
                        TreeNode newnode = new TreeNode(path);
                        addNode.Nodes.Add(newnode);
                        addNode = newnode;
                    }
                }
            }
            rootNode.ExpandAll();
        }
    }
}