Unable to Bind ListView.SelectedItems.Count to Button.IsEnabled - xaml

Question

I have a Button that I want to bind to the listview's selectedItem count. I cannot find where my error is. The button state is always enabled regardless of testListView.SelectedItems.Count.
Do I need a converter of some sort? If the Count is zero, it should implicitly convert that to a false no ?
<ListView x:Name="testListView" SelectionMode="Multiple" BorderThickness="1">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Name}"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Button x:Name="Button" Content="TestButton" IsEnabled="False" IsEnabled="{Binding ElementName=testListView, Path=SelectedItems.Count}"/>

Answer 1

Since the SelectedItems collection's Count property is of type int, and the IsEnabled property expects a bool input, and no implicit conversion of int to bool exists in C#, you'll need a converter or a data trigger.
A simple IValueConverter should do the trick, just use something like
return ((int)value) > 0;
as content of the Convert function!

Answer 2

Update using a DataTrigger via a Style; something like this should work:
<Button x:Name="Button" Content="TestButton">
<Button.Style>
<Style TargetType="Button">
<Setter Property="IsEnabled" Value="true" />
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=testListView, Path=SelectedItems.Count}" Value="0">
<Setter Property="IsEnabled" Value="false" />
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>