CODEWITHSUNDEEP
c#wpfeventsmvvmobservablecollection
Piero Alberto
Piero Alberto

Reputation: 3943

ObservableCollection: managing events

Working under MVVM pattern

T is a class, from my edmx file (entity framework).

O is an ObservableCollection<T>.

O is populated with all T from database.

Then, some fields of T, are edited by the user from the GUI.

How can I fire this event?

I don't want to edit my edmx file, I prefer to keep it like it was generated. So, this means I can't use something like this, because I should modify my model, implementing INotifyPropertyChanged.

Upvotes: 0

Views: 61

Answers (1)

Chris Mantle
Chris Mantle

Reputation: 6693

I don't think you should interact with model objects from your EDMX directly in the view (GUI). Create a view-model to wrap your model class T, have your new view-model implement INotifyPropertyChanged, and use that in the ObservableCollection. Pass in the model object when creating your view-model. When a property is changed on the view-model, update the model object and fire off the PropertyChanged event (I'm using YourEdmxClass in place of T because T is often used with generics):

public class YourEdmxClassViewModel : ViewModel
{
    private YourEdmxClass model;

    public YourEdmxClassViewModel(YourEdmxClass model)
    {
        this.model = model;
    }

    public int SomeProperty
    {
        get { return this.model.SomeProperty; }

        set
        {
            this.model.SomeProperty = value;
            this.RaisePropertyChanged(() => this.SomeProperty);
        }
    }
}

Upvotes: 1

Related Questions