Xamarin Forms: Multiple items for a converter

Question

I have a custom view which shows a "No Results" message when a page has no values.

 <common:NoResults 
    IsVisible="{Binding Details, 
    Converter={ StaticResource EmptyListIsTrueConverter }}"></common:NoResults>

The problem is when the page is loading, there are no values so it shows and should not.

Is there a way to combine a check for an empty list and another Model property like IsBusy into one Converter ?

I would add one property IsPageReady then ShowHide the content inside the page itself. When the Page is ready, then display the content . — Nirmal Subedi

Benl Benl · Accepted Answer · 2018-08-22T14:21:52

In IsVisible set the binding to a property DoneLoadingAndNoValues in the viewmodel with default value false.

Set this property to true when loading is done and Details contains no values.

ViewModel (implements INotifyPropertyChanged with OnPropertyChanged):

private bool doneLoadingAndNoValues = false; // default is false

public bool DoneLoadingAndNoValues
{
    get { return doneLoadingAndNoValues; }
    set
    {
        doneLoadingAndNoValues= value;
        OnPropertyChanged(nameof(DoneLoadingAndNoValues));
    }
}
...
// Done loading and Details contains no values:
DoneLoadingAndNoValues = true;

XAML:

<common:NoResults IsVisible="{Binding DoneLoadingAndNoValues}" />

Xamarin Forms: Multiple items for a converter

2 Answers