C#许多并行的长时间运行的任务

Question

I would like to scrape data from one site, so because rapidity is important for my project i must run tasks in parallel. I have a method like this:

public void UpdateData(List<string> myList)
{
    while(true)
    { 
      ...
      ...
    }
}

And i would like to call the method with different arguments from buttonClick Event so i used this code:

var uiContext = TaskScheduler.FromCurrentSynchronizationContext();
var task1 = Task.Factory.StartNew(() => UpdateData(myList1), CancellationToken.None, TaskCreationOptions.LongRunning, uiContext); 
var task2 = Task.Factory.StartNew(() => UpdateData(myList2), CancellationToken.None, TaskCreationOptions.LongRunning, uiContext);

The result is after first calling of tasks only the first one continues to update the argument(myList1). Where is the problem?

Answer 1

You're explicitly asking the Task Scheduler to run tasks on UI context. There is only one UI context, so only one thread will run at a time.

1. Perform your tasks on non-UI context
2. When you need the UI context, marshal the calls as needed