I'm trying to call System.Windows.Threading.Dispatcher.BeginInvoke
. The signature of the method is this:
BeginInvoke(Delegate method, params object[] args)
I'm trying to pass it a Lambda instead of having to create a Delegate.
_dispatcher.BeginInvoke((sender) => { DoSomething(); }, new object[] { this } );
It's giving me a compiler error saying that I
can't convert the lambda to a System.Delegate.
The signature of the delegate takes an object as a parameter and returns void. My lambda matches this, yet it's not working. What am I missing?
Shorter:
Since the method takes a System.Delegate, you need to give it a specific type of delegate, declared as such. This can be done via a cast or a creation of the specified delegate via new DelegateType as follows:
Also, as SLaks points out, Dispatcher.BeginInvoke takes a params array, so you can just write:
Or, if DoSomething is a method on this object itself:
Using Inline Lambda...
We create extension methods for this. E.g.
Now we can call it from within a form:
this.BeginInvoke(() => { ... })
.If you reference System.Windows.Presentation.dll from your project and add
using System.Windows.Threading
then you can access an extension method that allows you to use the lambda syntax.