CODEWITHSUNDEEP
.netwpfmvvmmvvm-light
ns12345
ns12345

Reputation: 3105

MVVM Light Messenger doesn't work

ViewModelA:

inside its constructor (breakpoint hits the foll. line):

Messenger.Default.Register<int>(this, "token", OnHitIt);

ViewModelB:

breakpoint does hit this line:

Messenger.Default.Send(hitItId, "token")

But for some reason breakpoint never hits OnHitIt method, what could be the reason...

Upvotes: 0

Views: 2189

Answers (2)

Jason Quinn
Jason Quinn

Reputation: 2563

Try using

On ViewModelA:

Messenger.Default.Register<NotificationMessage<int>>(this, OnHitIt);

And the OnHitIt method would be- 

private void OnHitIt(NotificationMessage<int> m)
{
    if (m.Notification == "token")
    {
        // code goes here
        // m.Content will get the int passed in
    }
}

On ViewModelB:

Messenger.Default.Send(new NotificationMessage<int>(hitItId, "token"));

Upvotes: 1

Ralph Shillington
Ralph Shillington

Reputation: 21098

One reason would be that ViewModelA is no longer referenced by anything, but more likely it's that token look-up is is by reference and not by value. In other words "token" in the Register is not the same reference as "token" in the Send.

Upvotes: 0

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