文件复制与进度栏 [英] File Copy with Progress Bar

问题描述

我用这个code：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;

namespace WindowsApplication1 {
  public partial class Form1 : Form {
    // Class to report progress
    private class UIProgress {
      public UIProgress(string name_, long bytes_, long maxbytes_) {
        name = name_; bytes = bytes_; maxbytes = maxbytes_;
      }
      public string name;
      public long bytes;
      public long maxbytes;
    }
    // Class to report exception {
    private class UIError {
      public UIError(Exception ex, string path_) {
        msg = ex.Message; path = path_; result = DialogResult.Cancel;
      }
      public string msg;
      public string path;
      public DialogResult result;
    }
    private BackgroundWorker mCopier;
    private delegate void ProgressChanged(UIProgress info);
    private delegate void CopyError(UIError err);
    private ProgressChanged OnChange;
    private CopyError OnError;

    public Form1() {
      InitializeComponent();
      mCopier = new BackgroundWorker();
      mCopier.DoWork += Copier_DoWork;
      mCopier.RunWorkerCompleted += Copier_RunWorkerCompleted;
      mCopier.WorkerSupportsCancellation = true;
      OnChange += Copier_ProgressChanged;
      OnError += Copier_Error;
      button1.Click += button1_Click;
      ChangeUI(false);
    }

    private void Copier_DoWork(object sender, DoWorkEventArgs e) {
      // Create list of files to copy
      string[] theExtensions = { "*.jpg", "*.jpeg", "*.bmp", "*.png", "*.gif" };
      List<FileInfo> files = new List<FileInfo>();
      string path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
      DirectoryInfo dir = new DirectoryInfo(path);
      long maxbytes = 0;
      foreach (string ext in theExtensions) {
        FileInfo[] folder = dir.GetFiles(ext, SearchOption.AllDirectories);
        foreach (FileInfo file in folder) {
          if ((file.Attributes & FileAttributes.Directory) != 0) continue;
          files.Add(file);
          maxbytes += file.Length;
        }
      }
      // Copy files
      long bytes = 0;
      foreach (FileInfo file in files) {
        try {
          this.BeginInvoke(OnChange, new object[] { new UIProgress(file.Name, bytes, maxbytes) });
          File.Copy(file.FullName, @"c:\temp\" + file.Name, true);
        }
        catch (Exception ex) {
          UIError err = new UIError(ex, file.FullName); 
          this.Invoke(OnError, new object[] { err });
          if (err.result == DialogResult.Cancel) break;
        }
        bytes += file.Length;
      }
    }
    private void Copier_ProgressChanged(UIProgress info) {
      // Update progress
      progressBar1.Value = (int)(100.0 * info.bytes / info.maxbytes);
      label1.Text = "Copying " + info.name;
    }
    private void Copier_Error(UIError err) {
      // Error handler
      string msg = string.Format("Error copying file {0}\n{1}\nClick OK to continue copying files", err.path, err.msg);
      err.result = MessageBox.Show(msg, "Copy error", MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
    }
    private void Copier_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
      // Operation completed, update UI
      ChangeUI(false);
    }
    private void ChangeUI(bool docopy) {
      label1.Visible = docopy;
      progressBar1.Visible = docopy;
      button1.Text = docopy ? "Cancel" : "Copy";
      label1.Text = "Starting copy...";
      progressBar1.Value = 0;
    }
    private void button1_Click(object sender, EventArgs e) {
      bool docopy = button1.Text == "Copy";
      ChangeUI(docopy);
      if (docopy) mCopier.RunWorkerAsync();
      else mCopier.CancelAsync();
    }
  }
}

发布<一个href=\"http://social.msdn.microsoft.com/forums/en-US/Vsex$p$pssvcs/thread/a285bdb9-6838-48f3-b8ed-1bf0156f8c51\"相对=nofollow>这里在复制文件和显示进度条状态（即 nobugz 的发布的）。

posted here (the one that nobugz posted) in copying files and displaying the status in progress bar.

我想不断递增进度栏复制，尤其是大型文件的价值。会发生什么事在这个code样品，在进度条的数值停在复制每个文件和一个文件被复制后，它就会递增到下一个文件的大小被复制。我希望它在Windows如 CopyFileEx 工作的进度条不断增加拷贝（我不能使用时， CopyFileEx ，因为我想有我自己的实现）。

I wanted to continuously increment the value of the progress bar while copying, especially large files. What happens in this sample code is that the value in progress bar stops on every file copied and after one file has been copied it will then increment to the size of the next file to be copied. I wanted it to work like CopyFileEx in Windows that progress bar continuously increment when copying (I cant use CopyFileEx because I wanted to have my own implementation).

推荐答案

您需要的是这样的：

    public delegate void ProgressChangeDelegate(double Persentage, ref bool Cancel);
    public delegate void Completedelegate();

    class CustomFileCopier
    {
        public CustomFileCopier(string Source, string Dest)
        {
            this.SourceFilePath = Source;
            this.DestFilePath = Dest;

            OnProgressChanged += delegate { };
            OnComplete += delegate { };
        }

        public void Copy()
        {
            byte[] buffer = new byte[1024 * 1024]; // 1MB buffer
            bool cancelFlag = false;

            using (FileStream source = new FileStream(SourceFilePath, FileMode.Open, FileAccess.Read))
            {
                long fileLength = source.Length;
                using (FileStream dest = new FileStream(DestFilePath, FileMode.CreateNew, FileAccess.Write))
                {
                    long totalBytes = 0;
                    int currentBlockSize = 0;

                    while ((currentBlockSize = source.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        totalBytes += currentBlockSize;
                        double persentage = (double)totalBytes * 100.0 / fileLength;

                        dest.Write(buffer, 0, currentBlockSize);

                        cancelFlag = false;
                        OnProgressChanged(persentage, ref cancelFlag);

                        if (cancelFlag == true)
                        {
                            // Delete dest file here
                            break;
                        }
                    }
                }
            }

            OnComplete();
        }

        public string SourceFilePath { get; set; }
        public string DestFilePath { get; set; }

        public event ProgressChangeDelegate OnProgressChanged;
        public event Completedelegate OnComplete;
    }

只要运行它在单独的线程和sunscribe为 OnProgressChanged 事件

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