Working column constantly running problem c #
I created a C # project using a desktop background. It contains a Start button to start the background worker. This is my code.
using System.Threading.Tasks;
using System.Windows;
namespace Test
{
public partial class MainWindow : Window
{
int status = 0;
private void btnstart_Click(object sender, RoutedEventArgs e)
{
worker.DoWork += worker_DoWork;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
worker.RunWorkerAsync();
Console.WriteLine("Background worker started successfully");
btnsave.IsEnabled = false;
}
private void worker_DoWork(object sender, DoWorkEventArgs e)
{
if (worker.CancellationPending)
{
e.Cancel = true;
return;
}
Console.WriteLine("Status : " + status);
if (status == 0)
{
status = 1;
}
}
private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
Console.WriteLine("worker completed");
btnsave.IsEnabled = true;
}
}
}
But every time I click the start button I get an output like this
attempt 1.
Status : 0
The thread 0x23dc has exited with code 0 (0x0).
Status : 1
attempt 2.
Status : 0
The thread 0x148 has exited with code 0 (0x0).
Status : 1
Status : 1
attempt 3.
Status : 0
The thread 0x128 has exited with code 0 (0x0).
Status : 1
Status : 1
Status : 1
I only start working with a background worker after the existing one is finished. Then why the "status" log is printed like this.
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1 answer
The problem comes from the assignment of the event handler:
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
This is done every time you press the button. Since its a + = you assign it multiple times.
Just add an event handler to your window initialization:
using System.Threading.Tasks;
using System.Windows;
namespace Test
{
public partial class MainWindow : Window
{
int status = 0;
// should be called when the window is loaded
private void ApplicationStart()
{
worker.DoWork += worker_DoWork;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
}
private void btnstart_Click(object sender, RoutedEventArgs e)
{
worker.RunWorkerAsync();
Console.WriteLine("Background worker started successfully");
btnsave.IsEnabled = false;
}
private void worker_DoWork(object sender, DoWorkEventArgs e)
{
if (worker.CancellationPending)
{
e.Cancel = true;
return;
}
Console.WriteLine("Status : " + status);
if (status == 0)
{
status = 1;
}
}
private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
Console.WriteLine("worker completed");
btnsave.IsEnabled = true;
}
}
}
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