Consider the following code:
private static BackgroundWorker bg = new BackgroundWorker();
static void Main(string[] args) {
bg.DoWork += bg_DoWork;
bg.ProgressChanged += bg_ProgressChanged;
bg.WorkerReportsProgress = true;
bg.RunWorkerAsync();
Thread.Sleep(10000);
}
static void bg_ProgressChanged(object sender, ProgressChangedEventArgs e) {
Console.WriteLine(e.ProgressPercentage);
Thread.Sleep(100);
Console.WriteLine(e.ProgressPercentage);
}
static void bg_DoWork(object sender, DoWorkEventArgs e) {
for (int i = 0; i < 10; i++) {
bg.ReportProgress(i);
}
}
When run I get the following output:
0
1
1
2
0
3
2
3
5
4
4
6
5
7
7
8
6
9
8
9
I understand that the issue is a race condition between the threads that BackgroundWorker starts for each call to ReportProgress.
How can I make sure that the whole body of each bg_ProgressChanged gets executed in the order I have called them?
That is I would like to get
0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9
as a result.
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