CODEWITHSUNDEEP
xamarin.formsmessaging
Emixam23
Emixam23

Reputation: 3954

Xamarin Forms - MessagingCenter between two different Pages/Projects

I'm searching to implement MessagingCenter for X reasons into my Xamarin Forms (Portable Project).

-I have to make communicates the MainPage.xaml.cs of the Project.WinPhone (Windows Phone 8.1) with the Pages/MyPersonalPage.xaml.cs of the Project (PCL Part)

I think I have to use the both following function:

Send : Send<TSender> (TSender sender, string message)

Subscribe : Subscribe<TSender> (object subscriber, string message, Action<TSender> callback, TSender source = null)

Maybe I misunderstood but, if <TSender> is in the WinPhone project and subscriber is in the Portable project, I can't link them about assemblies. (Infinite two ways link)

It means I can't either access MainPage.xaml.cs or Pages/MyPersonalPage.xaml.cs. Then, how should I do to make it works?

My code is already ok otherwise, I'm able to catch the Events that I need from the WinPhone part and I'm also able to make the modification I need in the PCL. The only problem is I need to call this method which makes the modification once the Event comes up

Upvotes: 3

Views: 3119

Answers (3)

Emanuel Nogueiras
Emanuel Nogueiras

Reputation: 47

This work perfect !!

(Xamarin Forms Portable Solution)

  1. In Android Project:
MessagingCenter.Send((App)Xamarin.Forms.Application.Current, "Hi");
  1. In Portable Project (PCL) Any View or Page


    MessagingCenter.Subscribe((App)Xamarin.Forms.Application.Current, "Hi", (sender) => {
       labelStatus.Text = "We have the Hi message here";
    });

Upvotes: -1

Emixam23
Emixam23

Reputation: 3954

As mentionned @AlessandroCaliaro by its Answer on Forums Xamarin

In OS side I use something like

Xamarin.Forms.MessagingCenter.Send<App> ((App)Xamarin.Forms.Application.Current, "OnBeaconServiceConnect");

In XF side I use this

MessagingCenter.Subscribe (this, "OnBeaconServiceConnect", (sender) => {
    // do something
});

It's says -> Use something like

So

OS side: MainPage.xaml.cs --> It's the WinPhone8.1 Part Below, but it should be the same for others plateforms (Android, iOS, Windows, UWP)

MessagingCenter.Send<Project.App>((Project.App)Xamarin.Forms.Application.Current, "Hi");

XF side: ListenerPage.xaml.cs

MessagingCenter.Subscribe<App>((App)Application.Current, "Hi", (sender) => {
    Debug.WriteLine("get hi !!!");
});

Thank !

Upvotes: 3

Keith Rome
Keith Rome

Reputation: 3228

TSender can be any class. It describes the event callback's message payload. For example, if you just wanted to send a string to subscribers then you would use Send<string>() and Subscribe<string>(). Or you can send more complex data structures... like maybe Send<Person>(newContact, "added") and Subscribe<Person>(this, "added", (newContact) => { //... }).

It is implemented as a Type reference so that you can use private classes for TSender, which basically means that nobody from outside of the declaring assembly can eavesdrop (private classes are not visible outside of the declaring assembly).

Upvotes: 1

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