CODEWITHSUNDEEP
c#
lucas
lucas

Reputation: 4685

Passing class type into a method parameter

Is there a way to pass a complex type as a parameter into a method. I would like to implement a more generic method listed below.

I would like to pass View (class) name into the method, instead of explicitly specifying 'ParticipantSummaryView' in teh case below. Thanks 

    private void InitializePdfView(ParticipantBasic selectedParticipant,
                                          string regionName, string viewName)
    {
        IRegion region = this.regionManager.Regions[regionName];
        if (region == null) return;

        // Check to see if we need to create an instance of the view.
        var view = region.GetView(viewName) as ParticipantSummaryView;
        if (view == null)
        {
            // Create a new instance of the EmployeeDetailsView using the Unity container.
            view = this.container.Resolve<ParticipantSummaryView>();

            // Add the view to the main region. This automatically activates the view too.
            region.Add(view, viewName);
        }
        else
        {
            // The view has already been added to the region so just activate it.
            region.Activate(view);
        }

        // Set the current employee property on the view model.
        var viewModel = view.DataContext as ParticipantSummaryViewModel;
        if (viewModel != null)
        {
            viewModel.CurrentParticipant = selectedParticipant;
        }
    }

Upvotes: 0

Views: 132

Answers (1)

nvoigt
nvoigt

Reputation: 77285

You can use generics:

 private void InitializePdfView<TView, TViewModel>(ParticipantBasic selectedParticipant, string regionName, string viewName)
{
    IRegion region = this.regionManager.Regions[regionName];
    if (region == null) return;

    // Check to see if we need to create an instance of the view.
    var view = region.GetView(viewName) as TView;
    if (view == null)
    {
        // Create a new instance of the EmployeeDetailsView using the Unity container.
        view = this.container.Resolve<TView>();

        // Add the view to the main region. This automatically activates the view too.
        region.Add(view, viewName);
    }
    else
    {
        // The view has already been added to the region so just activate it.
        region.Activate(view);
    }

    // Set the current employee property on the view model.
    var viewModel = view.DataContext as TViewModel;
    if (viewModel != null)
    {
        viewModel.CurrentParticipant = selectedParticipant;
    }
}

However, you will need to implement a constraint for your TViewModel because calling .CurrentParticipant on any type is not possible. You will need to make the viewModel variable dynamic or use a proper interface or base class for the viewmodel that has such a method.

Calling this could look like:

InitializePdfView<ParticipantSummaryView, ParticipantSummaryViewModel>(selectedParticipant, regionName, viewName);

Upvotes: 1

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