How to undo DoWork in Backgroundworker
I know this is not the first question about canceling BackGroundWorker, but I haven't found an answer to solve my problem.
I have a method that sends a file .. im using a backgroundworker to call it.
So how can I cancel the background worker in the middle of a file upload .. I mean where should I put
if (backgroundWorker1.CancellationPending == true)
{
e.Cancel = true;
break;
}
here's the code:
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
List<object> job = (List<object>)e.Argument;
string srcPath = (string)job[0];
string destPath = (string)job[1];
SendFile(srcPath, destPath);
}
Submit method:
private void SendFile(string srcPath, string destPath)
{
string dest = Path.Combine(destPath, Path.GetFileName(srcPath));
using (fs = new FileStream(srcPath, FileMode.Open, FileAccess.Read))
{
try
{
long fileSize = fs.Length;
if (sizeAll == 0)
sizeAll = fileSize;
sum = 0;
int count = 0;
data = new byte[packetSize];
SendCommand("receive<" + dest + "<" + fs.Length.ToString());
ProgressLabel(++fileCount, allFileCount);
InfoLabel("Sending " + srcPath, "busy");
while (sum < fileSize)
{
count = fs.Read(data, 0, data.Length);
network.Write(data, 0, count);
sum += count;
sumAll += count;
backgroundWorker1.ReportProgress((int)((sum * 100) / fileSize));
}
network.Flush();
}
finally
{
network.Read(new byte[1], 0, 1);
CloseTransfer();
}
}
}
I have to check CancellationPending in while () loop in submit method. But I can't get to the [e.Cancel] background worker from this method .. what should I do?
+3
source to share
2 answers
DoWorkEventArgs e can be passed as the third argument to SendFile:
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
List<object> job = (List<object>)e.Argument;
string srcPath = (string)job[0];
string destPath = (string)job[1];
SendFile(srcPath, destPath, e);
}
then SendFile will be
private void SendFile(string srcPath, string destPath, DoWorkEventArgs e)
and in your loop after ReportProgress
if (backgroundWorker1.CancellationPending == true)
{
e.Cancel = true;
return; // this will fall to the finally and close everything
}
+8
source to share
Place it in a loop while
:
while (sum < fileSize)
{
if (worker.CancellationPending)
{
e.Cancel = true;
break;
}
count = fs.Read(data, 0, data.Length);
network.Write(data, 0, count);
sum += count;
sumAll += count;
backgroundWorker1.ReportProgress((int)((sum * 100) / fileSize));
}
network.Flush();
+3
source to share