我刚刚进入WPF,我正在尝试与后台工作者的运气,所以我想我会打开任何文件使用FileOpenDialog
,通过文件内的所有字节循环,并报告总数通过worker.ReportProgress
以百分比的进度...唉,这只能用于〜20倍,然后它真的卡住,并突然停止在100%。Backgroundworker不能渲染窗口
这里是我的代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Win32;
using System.IO;
using System.Threading;
using System.ComponentModel;
namespace BitStream
{
public partial class MainWindow : Window
{
private int bytes = 0;
private long length = 0;
public MainWindow()
{
InitializeComponent();
}
private void selectFile_Click(object sender, RoutedEventArgs e)
{
BackgroundWorker bw = new BackgroundWorker();
OpenFileDialog ofd = new OpenFileDialog();
if ((bool)ofd.ShowDialog())
{
FileInfo fi = new FileInfo(ofd.FileName);
this.length = fi.Length;
bw.DoWork += bw_DoWork;
bw.RunWorkerCompleted += bw_RunWorkerCompleted;
bw.ProgressChanged += bw_ProgressChanged;
bw.WorkerReportsProgress = true;
Stream str = ofd.OpenFile();
bw.RunWorkerAsync(str);
}
}
private void bw_DoWork(object sender, DoWorkEventArgs e)
{
Stream str = (Stream)e.Argument;
int singleByte = 0;
this.Dispatcher.Invoke(
new Action(() =>
{
int currentProgress = 0;
while ((singleByte = str.ReadByte()) != -1)
{
label1.Content = singleByte;
bytes++;
currentProgress = Convert.ToInt32(((double)bytes)/length * 100);
if (currentProgress > progress)
{
progress = currentProgress;
((BackgroundWorker)sender).ReportProgress(progress);
Thread.Sleep(100);
}
}
}
), System.Windows.Threading.DispatcherPriority.Render);
}
private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
label2.Content = e.ProgressPercentage + "% completed";
}
private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
}
}
}
标签1和2是有用于显示当前字节和%目前的进展。
随意也批评我的代码的其他方面,我今天刚刚开始使用WPF。
编辑的DoWork法:
private void bw_DoWork(object sender, DoWorkEventArgs e)
{
Stream str = (Stream)e.Argument;
int singleByte = 0;
int currentProgress = 0;
while ((singleByte = str.ReadByte()) != -1)
{
this.Dispatcher.Invoke(
new Action(() =>
{
label1.Content = singleByte;
}), System.Windows.Threading.DispatcherPriority.Render);
bytes++;
currentProgress = Convert.ToInt32(((double)bytes)/length * 100);
if (currentProgress > progress)
{
progress = currentProgress;
this.Dispatcher.Invoke(
new Action(() =>
{
((BackgroundWorker)sender).ReportProgress(progress);
}), System.Windows.Threading.DispatcherPriority.Render);
Thread.Sleep(500);
}
}
}
感谢,
丹尼斯
我误读了你的代码,还是你将UI线程休眠了100ms,读取的每个文件字节? – AndrewS
您的阅读正确,我只是试图看看这是否与它没有任何关系,因为我用ReportProgress-Calls发送了垃圾邮件。 –
是的,但现在你正在UI线程上做所有事情 - 使用BackgroundWorker没有意义。 – AndrewS