frmexample1.cs

清华大学出版社出版的 移动应用开发宝典 张大威（2008）的附书源代码

using System;
using System.Windows.Forms;
using System.Diagnostics;
using System.Collections;
using System.IO;
using System.Threading;

namespace CodeForChapter11cs
{
  public partial class frmExample1 : Form
  {
    public frmExample1()
    {
      InitializeComponent();
    }

    private ArrayList allFiles = new ArrayList(); // holds the results
    private bool stopRequested = false;           // user hit the cancel button

    private void menuItem2_Click(object sender, EventArgs e)
    {
      // cancel
      stopRequested = true;
    }

    private void menuItem1_Click(object sender, EventArgs e)
    {
      // load list
      label1.Text = "";
      listBox1.DataSource = null;
      stopRequested = false;

      #region Thread solution
      Thread t = new Thread(this.GetAllFiles); //delegate inference
      t.Name = "Worker: allFiles populator";
      t.Start();

      t.Join(); // whatever thread is running, blocks waiting for t to exit
      #endregion

      label1.Text = allFiles.Count.ToString();
      listBox1.DataSource = allFiles;
      Debug.WriteLine("Got results " + listBox1.Items.Count.ToString());
    }

    private void GetAllFiles()
    {
      allFiles.Clear();
      this.PopulateAllFilesFor(@"\");
      Debug.WriteLine("Finished");
    }

    private void PopulateAllFilesFor(string path)
    {
      if (stopRequested)
      {
        Debug.WriteLine("cancelled 1");
        return;
      }
      Debug.WriteLine("Processing new path");

      allFiles.Add(path);

      string[] files;
      files = Directory.GetFiles(path);
      allFiles.AddRange(files);

      Debug.WriteLine(allFiles.Count.ToString());
      //label1.Text = allFiles.Count.ToString();    // comment out to avoid the NotSupportedException. Will revisit.

      if (stopRequested)
      {
        Debug.WriteLine("cancelled 2");
        return;
      }

      foreach (string subDirectory in Directory.GetDirectories(path))
      {
        this.PopulateAllFilesFor(subDirectory); //recursion
        if (stopRequested)
        {
          Debug.WriteLine("cancelled 3");
          return;
        }
      }
    }
  }
}