dont work with MVVM

[ghost1372]

i have a MVVM Project when i use this.DataContext = this; my MVVM Command not work.

[AleksandarDev]

@ghost1372 I see that you get NullReferenceException with btnShowDashboard which has nothing to do with WpfNotifications package. Is that correct?

[ghost1372]

yes btnShowDashboard Call a method in ViewModel if username and password is correct go to Dashboard UserControl and if incorrect send a message to LoginView for Showing Notification, if i dont write this.DataContext = this; notification dont shown and if i write this code my Command Not Execute, so is there any way to show notification without using this.DataContext = this; ???

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Update: i found problem when my command want to run need --> LoginViewModel as DataContext but Notification for Show need --> LoginView as DataContext so how i can fix this problem that both of them use LoginViewModel as DataContext?

[AleksandarDev]

You should trigger the Notifications from your ViewModel so only ViewModel needs to be bind to DataContext. From view you can call the method of ViewModel when needed (or trigger|execute the command)

In ideal case, you would place the NotificationMessageManager instance to your DI container as Singleton, or you can instantiate the NotificationMessageManager in the ViewModel and then bind the Manager property of NotificationsContainer to that instance from ViewModel like so:

<controls:NotificationMessageContainer Manager="{Binding Manager}" />

This will then bind to the ViewModel.Manager property if you specify DataContext of View to be the ViewModel.

Take a look at Basic Usage section from our readme.

[ghost1372]

tnx

[AleksandarDev]

Please let me know if that worked for you.

[ghost1372]

i will try this