UWP Prism UWP Viewmodel

Question

I have been using Prism's Viewmodel locator to instantiate my viewmodels using the prism naming conventions.I have come unstuck because I have created a user control with it's own viewmodel which I communicate with other viewmodels using the Prism Event Aggregator this is working nicely but I want to create other instances of this user control. Using the event aggregator all instances of the user control are obviously subscribing to the events published so:

How do I differentiate the actual user control that I want to target.
How do instantiate a viewmodel and target a view datacontext without using viewmodel locator?

Paul Stanley Paul Stanley · Accepted Answer · 2019-01-17T20:03:48

What I did was to create a dependency property in the user control called vmType.

    public string vmType
    {
        get { return (string)GetValue(vmTypeProperty); }
        set { SetValue(vmTypeProperty, value); viewModel.vmType = vmType; }
    }

    // Using a DependencyProperty as the backing store for vmType.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty vmTypeProperty =
        DependencyProperty.Register("vmType", typeof(string), typeof(UserControl), new PropertyMetadata(null));

In the set I marked the associated viewmodel property vmType to what the user control was supposed be used for. In the XAMl of the parent view just set vmType towhat ever you need.

UWP Prism UWP Viewmodel

1 Answers