I am working with threads in C#. Below is the code which I am using
// worker thread
Thread m_WorkerThread;
// events used to stop worker thread
ManualResetEvent m_EventStopThread;
ManualResetEvent m_EventThreadStopped;
private void btnSend_Click(object sender, EventArgs e)
{
if (btnSend.Text == "Cancel")
{
StopThread();
btnSend.Text = "Send";
return;
}
else
{
// initialize events
m_EventStopThread = new ManualResetEvent(false);
m_EventThreadStopped = new ManualResetEvent(false);
btnSend.Text = "Cancel";
// reset events
m_EventStopThread.Reset();
m_EventThreadStopped.Reset();
// create worker thread instance
m_WorkerThread = new Thread(new ThreadStart(this.ThreadFunction));
m_WorkerThread.Name = "Thread Sample"; // looks nice in Output window
m_WorkerThread.Start();
}
}
private void StopThread()
{
if (m_WorkerThread != null && m_WorkerThread.IsAlive) // thread is active
{
// set event "Stop"
m_EventStopThread.Set();
// wait when thread will stop or finish
try
{
Thread.Sleep(1000);
m_WorkerThread.Abort();
m_WorkerThread.Suspend();
}
catch { }
}
ThreadFinished(); // set initial state of buttons
return;
}
private void ThreadFunction()
{
// Doing My Work
}
private void ThreadFinished()
{
btnSend.Text = "Send";
}
The code above is working fine, but I have some problems.
btnSend.Text = "Send"
is not setting. How can I fix these problems?
This is an example of how to use a BackgroundWorker
with cancellation:
public partial class Form1 : Form
{
bool _isWorking = false;
public Form1()
{
InitializeComponent();
backgroundWorker1.DoWork += backgroundWorker1_DoWork;
backgroundWorker1.RunWorkerCompleted += backgroundWorker1_RunWorkerCompleted;
backgroundWorker1.WorkerSupportsCancellation = true;
}
private void button1_Click(object sender, EventArgs e)
{
if (_isWorking)
{
// Cancel the worker
backgroundWorker1.CancelAsync();
button1.Enabled = false;
return;
}
_isWorking = true;
button1.Text = "Cancel";
backgroundWorker1.RunWorkerAsync();
}
void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
for (var i = 0; i < 10; i++)
{
if (backgroundWorker1.CancellationPending) { return; }
Thread.Sleep(1000);
}
e.Result = "SomeResult";
}
void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
_isWorking = false;
button1.Enabled = true;
button1.Text = "Run";
if (e.Cancelled) return;
// Some type checking
string theResult = e.Result as string;
if (theResult == null) return; // Or throw an error or whatever u want
MessageBox.Show(theResult);
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.