Application Dispatcher and Control Dispatcher

Question

Assume i have control button with name \"button1\" and function with name \"doSomething\". Function \"doSomething\" is called from another thread.

i have two method

Answer 1

All of UI controls (which were created normally), share the same dispatcher instance. That dispatcher is working on UI thread. If you create some control on backgroud thread, it will create new dispatcher on that thread, and this will not be very good. The best way to avoid most problems with threading and UI controls both in WinForms and WPF is to use System.Threading.SynchronizationContext.Current. The workflow is simple: you get System.Threading.SynchronizationContext.Current while you are on UI thread and save it somewhere (for example in a public static field). Then, whenever you want to run some code on UI thread, you access that persisted SynchronizationContext intance and use its Send or Post methods. It will run you delegates on thread, where SynchronizationContext was achieved (for current case on UI thread). Also it is smart enough, to use the current way of Invoking (message loop for WinForms and dispatcher for WPF) and also if you are already calling from UI thread it will just run your delegate synchronously. Just keep in mind, that you should get SynchronizationContext only after you create your first control on the current UI thread, because SynchronizationContext will be initialized right after that.