FileCopy不会在进度条上显示复制的文件进度。它在复制操作完成时显示 [英] FileCopy doesnt showing copied file progress on progressbar.Its showing while copy operation is completed
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问题描述
我有应用文件的Windows应用程序，进度条显示复制的进度。但是无法更新进度条。当复制操作完成时它会更新。
public partial class FileCopy：Form
{
private BackgroundWorker bw = new BackgroundWorker（ ）;
public FileCopy（）
{
InitializeComponent（）;
bw.WorkerReportsProgress = true ;
bw.WorkerSupportsCancellation = true ;
bw.DoWork + = new DoWorkEventHandler（bw_DoWork）;
bw.ProgressChanged + = new ProgressChangedEventHandler（bw_ProgressChanged）;
bw.RunWorkerCompleted + = new RunWorkerCompletedEventHandler（bw_RunWorkerCompleted）;
}
onstartButtonClick（）
{
线程readerThread = 新线程（ new ThreadStart（readData））;
readerThread.Start（）;
线程writerThread = new 线程（ new ThreadStart（writeData））;
writerThread.Start（）;
writerThread.Join（）;
readerThread.Join（）;
}
readData（）
{
while （length > 0 ）
{
data = br.ReadBytes（data.Length）;
Buffer.putData（data）;
length = length - data.Length;
Console.WriteLine（ 读取{0}，data.Length）;
bw.ReportProgress（ 10 ）;
}
Buffer.STOP = false ;
Buffer._reset.Set（）;
}
private void bw_ProgressChanged（ object sender，ProgressChangedEventArgs e）
{
this .BeginInvoke（ new 操作（（）= >
{
Console.WriteLine（ 内部开始调用）;
progressBar1.Value = e.ProgressPercentage;
Application.DoEvents（）;
}） ）;
}
public void writeData（）
{
while （Buffer.STOP）
{
if （ Buffer.STOP！= false ）
{
Buffer._reset.WaitOne（）;
byte [] data = Buffer.takeData（）;
if （data！= null && Buffer.STOP == true ）
{
fs.Write（data， 0 ，data.Length）;
fs.Flush（）;
}
Console.WriteLine（ 写入文件： +数据。长度）;
Buffer._reset.Reset（）;
}
}
}
}
静态 class 缓冲区
{
public static byte [] _data = new byte [ 10240 ];
public static AutoResetEvent _reset = new AutoResetEvent（ false ）;
私有 静态 bool _isStop = true ;
public static bool STOP
{
get
{
return _isStop;
}
set
{
_isStop = value ;
}
}
public static void putData（ byte [] data）
{
_data = data;
Console.WriteLine（ 数据长度： + data.Length）;
_reset.Set（）;
}
public static byte [] takeData（）
{
return _data;
}
}
进度在运营结束时更新。
能否请您提出解决方案??
解决方案
为了执行文件复制并保持UI响应，你通常会想到多线程。但是你的实现有点远了;）
你的代码没有显示bw_DoWork（）。文件复制应该在那里进行。您不需要其他两个线程和Buffer-class。这太复杂了。只需要一个循环从一个文件中读取一大块字节并将其写入新文件，直到它到达文件末尾。
你不需要在BackgroundWorker的Eventhandler-Methods中调用，您不需要Application.DoEvents（）。
有关使用BackgroundWorker的示例，请看一下：
http://www.dotnetperls.com/progressbar [ ^ ]
http://stackoverflow.com/a/1068743/4320056 [ ^ ]
http://www.codeproject.com/Messages/5050414/Re-WinForms-Update-A- Dialog.aspx [ ^ ]
I have windows application for coping file with progress bar showing copied progress.But could not update progress bar.Its get updated when copy operation is get completed.
public partial class FileCopy : Form
{
private BackgroundWorker bw = new BackgroundWorker();
public FileCopy()
{
InitializeComponent();
bw.WorkerReportsProgress = true;
bw.WorkerSupportsCancellation = true;
bw.DoWork += new DoWorkEventHandler(bw_DoWork);
bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
}
onstartButtonClick()
{
Thread readerThread = new Thread(new ThreadStart(readData));
readerThread.Start();
Thread writerThread = new Thread(new ThreadStart(writeData));
writerThread.Start();
writerThread.Join();
readerThread.Join();
}
readData()
{
while (length > 0)
{
data = br.ReadBytes(data.Length);
Buffer.putData(data);
length = length - data.Length;
Console.WriteLine("Reading {0}", data.Length);
bw.ReportProgress(10);
}
Buffer.STOP = false;
Buffer._reset.Set();
}
private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.BeginInvoke(new Action(() =>
{
Console.WriteLine("Inside Begin Invoke");
progressBar1.Value = e.ProgressPercentage;
Application.DoEvents();
}));
}
public void writeData()
{
while (Buffer.STOP)
{
if (Buffer.STOP != false)
{
Buffer._reset.WaitOne();
byte[] data = Buffer.takeData();
if (data != null && Buffer.STOP == true)
{
fs.Write(data, 0, data.Length);
fs.Flush();
}
Console.WriteLine("Writing to file :" + data.Length);
Buffer._reset.Reset();
}
}
}
}
static class Buffer
{
public static byte[] _data = new byte[10240];
public static AutoResetEvent _reset = new AutoResetEvent(false);
private static bool _isStop = true;
public static bool STOP
{
get
{
return _isStop;
}
set
{
_isStop = value;
}
}
public static void putData(byte[] data)
{
_data = data;
Console.WriteLine("Data Length :" + data.Length);
_reset.Set();
}
public static byte[] takeData()
{
return _data;
}
}
Progress is updated at end of operation.
Can you please suggest solution??
解决方案
You're generally on the right track with the idea of multi-threading in order to perform the file-copy and keeping your UI responsive. But your implementation is a bit far off ;)
Your code isn't showing what's happening inbw_DoWork(). The file-copying should take place there. You don't need the other two threads and the Buffer-class. That's overcomplicating things. Just have a loop that reads from one file a chunk of bytes and writes it to the new file until it's reached the end of the file.
You don't need an Invoke in the Eventhandler-Methods of the BackgroundWorker and you don't need an Application.DoEvents().
For examples of using a BackgroundWorker please take a look here:
http://www.dotnetperls.com/progressbar[^]
http://stackoverflow.com/a/1068743/4320056[^]
http://www.codeproject.com/Messages/5050414/Re-WinForms-Update-A-Dialog.aspx[^]
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