Add null check to discern on element being an action (microsoft#3119)

Identifier · Jul 2, 2019 · e5f597d · e5f597d
1 parent 3c56ac3
commit e5f597d
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/source/dotnet/Library/AdaptiveCards.Rendering.Wpf/AdaptiveRenderContext.cs b/source/dotnet/Library/AdaptiveCards.Rendering.Wpf/AdaptiveRenderContext.cs
@@ -314,6 +314,13 @@ private TagContent GetTagContent(FrameworkElement element)
  /// <param name="tagContent">Rendered element tag</param>
  public void SetVisibility(FrameworkElement element, bool desiredVisibility, TagContent tagContent)
  {
+ // TagContents are only assigned to card elements so actions mustn't have a TagContent object tied to it
+ // TagContents are used to save information on the rendered object as the element separator
+ if (tagContent == null)
+ {
+ return;
+ }
+
  bool elementIsCurrentlyVisible = (element.Visibility == Visibility.Visible);
 
  element.Visibility = desiredVisibility ? Visibility.Visible : Visibility.Collapsed;