You can use Dispatcher even in a WinForms app. If you are sure to be on a UI thread (e.g. in an button.Click handler), Dispatcher.CurrentDispatcher gives you the UI thread dispatcher that you can later use to dispatch from background threads to the UI thread as usual.
When you use Dispatcher.BeginInvoke it means that it schedules the given action for execution in the UI thread at a later point in time, and then returns control to allow the current thread to continue executing. Invoke blocks the caller until the scheduled action finishes. When you use BeginInvoke your loop is going to run … Read more
You have to Invoke() so you can wait for the function to return and obtain its return value. You’ll also need another delegate type. This ought to work: public static string readControlText(Control varControl) { if (varControl.InvokeRequired) { return (string)varControl.Invoke( new Func<String>(() => readControlText(varControl)) ); } else { string varText = varControl.Text; return varText; } }
Action is a Type of Delegate provided by the .NET framework. The Action points to a method with no parameters and does not return a value. () => is lambda expression syntax. Lambda expressions are not of Type Delegate. Invoke requires Delegate so Action can be used to wrap the lambda expression and provide the … Read more
Shorter: _dispatcher.BeginInvoke((Action)(() => DoSomething()));
Do you mean Delegate.Invoke/BeginInvoke or Control.Invoke/BeginInvoke? Delegate.Invoke: Executes synchronously, on the same thread. Delegate.BeginInvoke: Executes asynchronously, on a threadpool thread. Control.Invoke: Executes on the UI thread, but calling thread waits for completion before continuing. Control.BeginInvoke: Executes on the UI thread, and calling thread doesn’t wait for completion. Tim’s answer mentions when you might want to … Read more