Task.Factory.StartNew with async lambda and Task.WaitAll

Question

I\'m trying to use Task.WaitAll on a list of tasks. The thing is the tasks are an async lambda which breaks Tasks.WaitAll as it never waits.

Answer 1

you have to use the Task.ContinueWith method. Like this

List tasks = new List();
tasks.Add(Task.Factory.StartNew(() =>
{
    using (dbContext = new DatabaseContext())
    {
        return dbContext.Where(r => r.Id = 100).ToListAsync().ContinueWith(t =>
            {
                var records = t.Result;
                // do long cpu process here...
            });
        }
    }
}