Portable class library equivalent of Dispatcher.Invoke or Dispatcher.RunAsync

Question

In .NET, Windows 8 and Windows Phone 7 I have code similar to this:

public static void InvokeIfRequired(this Dispatcher dispatcher, Action action)
{
    if (         


        

Answer 1

You can use SynchronizationContext.Post or Send method. It is portable, and when you use a UI framework with a dispatcher then the current synchronization context will delegate the work to the Dispatcher.

Specifically, you can use the following code:

void InvokeIfRequired(this SynchroniationContext context, Action action)
{
    if (SynchroniationContext.Current == context)
    {
        action();
    }
    else
    {
        context.Send(action) // send = synchronously
        // context.Post(action)  - post is asynchronous.
    }  
}