Saya mencoba tes yang sangat sederhana untuk menggunakan BackgroundWorker di aplikasi saya. Saya dapat melihat bahwa pekerja latar belakang melakukan hal itu tetapi karena alasan tertentu thread utama mendapat pemberitahuan kemajuan.
Saya pasti melewatkan sesuatu yang sangat mendasar di sini. Adakah yang bisa menunjukkan kesalahan saya?
Berikut kode untuk tes sederhana saya:
namespace TestBackgroundWorker
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
progressBar1.Maximum = 100;
progressBar1.Minimum = 0;
progressBar1.Value = 0;
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
int progress = 0;
while (true)
{
Thread.Sleep(1000);
System.Diagnostics.Debug.WriteLine("worker: progress={0}", progress);
worker.ReportProgress(progress);
progress = (progress + 10) % 100;
}
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
System.Diagnostics.Debug.WriteLine("main: process progress={0}", e.ProgressPercentage);
progressBar1.Value = e.ProgressPercentage;
}
}
}
Dan inilah yang saya dapatkan di jendela keluaran. Ini menunjukkan bahwa pekerja sudah bangun dan melakukan tugasnya tetapi thread utama tidak mendapatkan pembaruan kemajuan apa pun:
worker: progress=0
worker: progress=10
worker: progress=20
worker: progress=30
worker: progress=40
worker: progress=50
worker: progress=60
worker: progress=70
worker: progress=80
worker: progress=90
worker: progress=0
worker: progress=10
worker: progress=20
worker: progress=30
worker: progress=40
worker: progress=50
worker: progress=60
worker: progress=70
worker: progress=80
The thread '<No Name>' (0x1e84) has exited with code 0 (0x0).
worker: progress=90
worker: progress=0
worker: progress=10
worker: progress=20
worker: progress=30
worker: progress=40
worker: progress=50
worker: progress=60
worker: progress=70
worker: progress=80
worker: progress=90
worker: progress=0
worker: progress=10
worker: progress=20
worker: progress=30
worker: progress=40
worker: progress=50
worker: progress=60
worker: progress=70
worker: progress=80
worker: progress=90
worker: progress=0
worker: progress=10
worker: progress=20
worker: progress=30
worker: progress=40
worker: progress=50
The thread 'vshost.RunParkingWindow' (0x2760) has exited with code 0 (0x0).
The thread '<No Name>' (0x29c8) has exited with code 0 (0x0).
The program '[3528] TestBackgroundWorker.vshost.exe: Managed (v4.0.30319)' has exited with code 0 (0x0).