WPF

SledgeHammer01 wrote:

The VM knows it needs to show a dialog or window or slide something into view via an animation, or whatever.

SledgeHammer01 wrote:

Doing it the way you suggested means VM A knows about VM B and intimately knows VM B wants View B attached to it, the DataContext set, etc.

SledgeHammer01 wrote:

Going the way I suggested is more consistent with how the web works. I don't do web stuff, so its kind of ironic... but on the web, you redirect to the .html (the "view"), not the .cs (the "view model").

public class MaterialDataTemplateSelector : DataTemplateSelector
{
    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        FrameworkElement element = container as FrameworkElement;
        MaterialsViewModel materials = item as MaterialsViewModel;

        string resKey = "materialsTemplateFor" + Enum.GetName(typeof(MaterialType), materials.MaterialType);
        return element.FindResource(resKey) as DataTemplate;
    }
}

<DataTemplate x:Key="materialsTemplateForType1">
    <views:MaterialType1View />
</DataTemplate>

<DataTemplate x:Key="materialsTemplateForType2">
    <views:MaterialType2View />
</DataTemplate>

<views:MaterialDataTemplateSelector x:Key="materialDataTemplateSelector" />

<ContentControl ContentTemplateSelector="{StaticResource materialDataTemplateSelector}" />

      var binding = new Binding();
      binding.Source = DictThresholds;
      binding.Converter = new DictionaryLookupConverter();
      binding.ConverterParameter = thresholdKey;
      newThresholdLine.SetBinding(HorizontalLine.ValueProperty, binding);

class DictionaryLookupConverter : IValueConverter
{
  public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  {
    object result;
    IDictionary dict = value as IDictionary;
    if (dict == null || parameter == null || !dict.TryGetValue(parameter, out result))
    {
      return DependencyProperty.UnsetValue;
    }
    return result;
  }
}