Invoke method on event handler in Delphi - delphi

Question

As following an example of a code written in C# that use an SDK (in-proc COM object)
I've created a class: TSwitcherMonitor, and now I've to assign the callback function to my object property: OnSwitcherDisconnected property. I've this call example in C#, the note talk about double use of lambda expressions. I've googled on this and it seem that Delphi does not have lambda expression.
Here is the call in C#:
Q1: There is a way to do the same way in Delphi using the invoke method or we have to do this in a different way ?
//Create callbacks object
m_switcherMonitor := TSwitcherMonitor.Create(Application.Handle);
// note: this invoke pattern ensures our callback is called in the main thread. We are making double
// use of lambda expressions here to achieve this.
// Essentially, the events will arrive at the callback class (implemented by our monitor classes)
// on a separate thread. We must marshell these to the main thread, and we're doing this by calling
// invoke on the Windows Forms object. The lambda expression is just a simplification./
m_switcherMonitor.OnSwitcherDisconnected += new SwitcherEventHandler((s, a) => this.Invoke((Action)(() => SwitcherDisconnected())));
Q2 : The only thinks I want, is to have a working callback on using the SDK. Does my declaration of TSwitcherEventHandler is correct ?
In reference, here is my TSwitcherEventHandler declaration and my TSwitcherMonitor class:
Type
{TSwitcherEventHandler}
TSwitcherEventHandler = procedure(const sender: TObject; const args: TObject) of object;
{TSwitcherMonitor}
TSwitcherMonitor = Class(TComObject, IBMDSwitcherCallback)
private
FHwnd: HWND;
FSwitcherDisconnected: TSwitcherEventHandler;
published
constructor Create(hWnd: HWND);
public
function Notify(eventType: _BMDSwitcherEventType): HResult; stdcall;
property OnSwitcherDisconnected: TSwitcherEventHandler read FSwitcherDisconnected write FSwitcherDisconnected;
end;
implementation
{ TSwitcherMonitor }
constructor TSwitcherMonitor.Create(hWnd: HWND);
begin
FHwnd:= hWnd;
end;
function TSwitcherMonitor.Notify(eventType: _BMDSwitcherEventType): HRESULT; stdcall;
begin
if eventType = bmdSwitcherEventTypeDisconnected then
if assigned(FSwitcherDisconnected) then
FSwitcherDisconnected(self, nil);
result := S_OK;
end;

Answer 1

I'm not a "Delphi experts" but for shure, as many says, Delphi Rocks !
The C# line:
m_switcherMonitor.OnSwitcherDisconnected += new SwitcherEventHandler((s, a) => this.Invoke((Action)(() => SwitcherDisconnected())));
can be translated in Delphi as simple as:
m_switcherMonitor.OnSwitcherDisconnected := switcherMonitor_OnSwitcherDisconnected;
Now my sample application work. Delphi do some automatic job with pointer and when tranlating C# or C++ code in Delphi just writing it in is more simple expression and Delphi do the job. At the start, it's weird and hard to work with this kind of black magic, when we try to understand how the things works, but Delphi is certainly a true RAD as they advertise.