Question

In our application ,we use TPL to create tasks whenever we would want to make a service call.We have a busy indicator which is set to true whenever a task is started and cleared whenever the task is completed or faulted.Is there any way to accomplish this in a generic way instead of doing this for every single task created ?

First instance :

        ComponentViewModel.Instance.IsApplicationBusy = true;
        ComponentViewModel.Instance.BusyMessage = "Loading...";

        var task1 = Task.Factory.StartNew(() => DoTask1());
        task1.ContinueWith(antecdent =>
        {
            ComponentViewModel.Instance.IsApplicationBusy = false;
            CustomAction1();
        }

Second Instance :

        ComponentViewModel.Instance.IsApplicationBusy = true;
        ComponentViewModel.Instance.BusyMessage = "Loading...";

        var task2 = Task.Factory.StartNew(() => DoTask2());
        task2.ContinueWith(antecdent =>
        {
            ComponentViewModel.Instance.IsApplicationBusy = false;
            CustomAction2();
        }

the same is logic is repeated all through the application whenever a service call is made is there any way to avoid this repetition ?

For example there is a dragstarted and dragcompleted events which get fired for all drag operations , so it possible to have taskstarted and taskcompleted event possibly by extending the task factory or otherwise ?

Edit : Made changes so that the question is more clear.You can now observe that steps before starting and ending a task is same but different functions needs to be executed for each task when it runs to completion

Answer 1

EDIT: It appears I’ve misunderstood the question. Creating this “start, wait, continue” as a centralized function is a good move, and could be created like this:

public void DoIt(Action ThingToDo) {
    ComponentViewModel.Instance.IsApplicationBusy = true;
    ComponentViewModel.Instance.BusyMessage = "Loading...";

    var loadProviderTask = Task.Factory.StartNew(ThingToDo);
    loadProviderTask.ContinueWith(antecdent =>
    {
        ComponentViewModel.Instance.IsApplicationBusy = false;
    }
}