CODEWITHSUNDEEP
c#listviewdata-bindingxamarinxamarin.forms
user2283597
user2283597

Reputation: 229

Xamarin - how to get ListView source data from two classes?

I have a Xamarin ListView in a Xamarin.Form application. It is initialised as below:

ListView listView = new ListView
        {
            HasUnevenRows = true,
            ItemTemplate = new DataTemplate(typeof(StudentCell)),
            ItemsSource = register.StudentList,
            SeparatorColor = Color.FromHex("#ddd")
        };
        listView.ItemSelected += OnSelection;

I can't seem to find anything online about how/ if I can make the ItemsSource two seperate classes. I have a student list that contains data such as Name and Status, but need to load an image from another class for each item in the student list.

Is there any way to do this?

Alternatively, I have made a custom cell type, StudentCell. Is there a way to specify a binding to another class (not a student) from within the custom template?

Upvotes: 1

Views: 1413

Answers (2)

Jason
Jason

Reputation: 89129

This is what the VM (ViewModel) in the MVVM pattern is for. It allows your View (ListView) to display data from more than one model (Student and Image) by creating a ViewModel class that combines data from multiple sources.

In your case, you might create a StudentViewModel class that contains both a Student and an Image. Then you would bind your ListView to the ViewModel class.

Upvotes: 2

Pete
Pete

Reputation: 4746

One possibility to consider is that from the register.StudentList, lets say its of type Student, should you not be able to include a StudentImage property in that class, then perhaps derive a new class, say StudentWithImage that inherits from Student so it will have the same properties.

You can then add your StudentImage property to this new class that inherits from Student.

On the result set returned, you can then enumerate all the instances of it, and set the StudentImage property to the appropriate value by performing a lookup on your other class.

You can then just bind your list of StudentWithImages to your Xamarin.Forms List and work from a single datasource.

Upvotes: 3

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