后台工作ReportProgress不点火 [英] Background Worker ReportProgress not firing
问题描述
我设立的第一次后台工作。它主要工作作为代码运行和我的止损/取消按钮工作。不过，我也想报告进度更新进度条，但我不能得到这个在各消防。
I'm setting up a background worker for the first time. It is mostly working as the code runs and my stop/cancel button is working. However, I am also trying to report progress to update a progress bar but I cannot get this to fire at all.
我从中运行此点击一个按钮启动代码代码：
I start the code from a button click which runs this code:
backgroundWorker1.WorkerSupportsCancellation = true;
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.RunWorkerAsync();//this invokes the DoWork event
我Do_Work方法：
My Do_Work method:
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
int j = 0;// Count cumulative imported files
int countDupFiles = 0;// Count number of previously imported csv files
int countImportedFiles = 0;// Count imported files
foreach (string folderPath in csvDirList)
{
string[] csvFileNames = Directory.GetFiles(@folderPath, "*.csv");
frmImportCsvData.replaceAll(csvFileNames, folderPath + "\\", "");
for (int i = 0; i < csvFileNames.Length; i++, j++)
{
string csvFilePath = folderPath + "\\" + csvFileNames[i];
if ((worker.CancellationPending == true))
{
e.Cancel = true;
break;
}
else
{
if (dataLayer.ImportCsvDataBkgrnd(this, csvFilePath, compIdValue, csvFileCount, i))//new method processes subdirectories if tick box selected
{
countImportedFiles = countImportedFiles + 1;
}
else
{
countDupFiles = countDupFiles + 1;
}
System.Threading.Thread.Sleep(500);
}
worker.ReportProgress(j);//tried using worker and backgroundWorker1 but neither works
backgroundWorker1.ReportProgress(j);
//string proj = j.ToString();
//MessageBox.Show(proj);//Displays incrementing j as expected when not commented out
}
}
if (countImportedFiles > 0)
MessageBox.Show(countImportedFiles + " files were imported.");
if (countDupFiles > 0)
MessageBox.Show(countDupFiles + " files were not imported. Matches all ready in Database.");
}
试图火这两种ProgressChanged事件：
Trying to fire either of these ProgressChanged events:
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
string tbProgress = (e.ProgressPercentage.ToString() + "%");
MessageBox.Show(tbProgress + "backgroundWorker1");
importProgressBar(e.ProgressPercentage);
}
private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
string tbProgress = (e.ProgressPercentage.ToString() + "%");
MessageBox.Show(tbProgress + "worker");
importProgressBar(e.ProgressPercentage);
}
最后，我想对ProgressChanged事件来触发这个方法来更新我的进度条
Finally, I want the ProgressChanged event to trigger this method to update my progress bar:
public void importProgressBar(int i)
{
progressTableLayoutPanel.Visible = true;//display progress bar
int percProgress = 100 * (i + 1) / csvFileCount;
if (percProgress <= 99)// Required to prevent values above 100 that crash the code
progressBar.Value = percProgress + 1;//hack that makes the progress bar update when progress value decreases
progressBar.Value = percProgress;
percProgressLabel.Text = percProgress.ToString();
progressTableLayoutPanel.Update();//Required to display all progress bar table contents
//Thread.Sleep(200);
if (percProgress >= 100)
{
Thread.Sleep(200);
progressTableLayoutPanel.Visible = false;
}
}
取消按钮的代码，它的工作原理，看起来像这样
The cancel button code, which works, looks like this:
private void stopImportButton_Click(object sender, EventArgs e)
{
backgroundWorker1.CancelAsync();
}
在我的ProgressChanged事件的消息框从来没有显示出来，并永远不会把我的进度条为可见。任何想法的问题可能是什么
The messageboxes in my ProgressChanged events never show up and my progress bar is never set to visible. Any ideas what the problem could be?
推荐答案
检查这个例子：
BackgroundWorker bgw = new BackgroundWorker();
public Form1()
{
InitializeComponent();
label1.Text = "";
label2.Text = "";
}
private void button1_Click_1(object sender, EventArgs e)
{
if (bgw == null)
{
bgw = new BackgroundWorker();
bgw.DoWork += new DoWorkEventHandler(bgw_DoWork);
bgw.ProgressChanged += new ProgressChangedEventHandler(bgw_ProgressChanged);
bgw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgw_RunWorkerCompleted);
}
bgw.WorkerReportsProgress = true;
bgw.WorkerSupportsCancellation = true;
bgw.RunWorkerAsync();
}
void bgw_DoWork(object sender, DoWorkEventArgs e)
{
int total = 57; //some number (this is your variable to change)!!
for (int i = 0; i <= total; i++) //some number (total)
{
System.Threading.Thread.Sleep(100);
int percents = (i * 100) / total;
bgw.ReportProgress(percents, i);
//2 arguments:
//1. procenteges (from 0 t0 100) - i do a calcumation
//2. some current value!
}
}
void bgw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
label1.Text = String.Format("Progress: {0} %", e.ProgressPercentage);
label2.Text = String.Format("Total items transfered: {0}", e.UserState);
}
void bgw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
//do the code when bgv completes its work
}
}
这也许可以帮助你解决问题...
Maybe this helps you with your problem...
和尝试把进度可见调用background.doWork在按钮单击事件之后。
And try to put the progress to visible just after you call the background.doWork in the button click event.
这篇关于后台工作ReportProgress不点火的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
