ImageEx: Change visual state then issue event.

Author: Rosuavio

Microsoft.Toolkit.Uwp.UI.Controls.Core/ImageEx/ImageExBase.Source.cs

@@ -129,8 +129,8 @@ private async void SetSource(object source)
                 var url = source as string ?? source.ToString();
                 if (!Uri.TryCreate(url, UriKind.RelativeOrAbsolute, out uri))
                 {
-                    ImageExFailed?.Invoke(this, new ImageExFailedEventArgs(new UriFormatException("Invalid uri specified.")));
                     VisualStateManager.GoToState(this, FailedState, true);
+                    ImageExFailed?.Invoke(this, new ImageExFailedEventArgs(new UriFormatException("Invalid uri specified.")));
                     return;
                 }
             }
@@ -150,8 +150,8 @@ private async void SetSource(object source)
             }
             catch (Exception e)
             {
-                ImageExFailed?.Invoke(this, new ImageExFailedEventArgs(e));
                 VisualStateManager.GoToState(this, FailedState, true);
+                ImageExFailed?.Invoke(this, new ImageExFailedEventArgs(e));
             }
         }
 

Microsoft.Toolkit.Uwp.UI.Controls.Core/ImageEx/ImageExBase.cs

@@ -166,8 +166,8 @@ protected override void OnApplyTemplate()
         /// <param name="e">Event Arguments</param>
         protected virtual void OnImageOpened(object sender, RoutedEventArgs e)
         {
-            ImageExOpened?.Invoke(this, new ImageExOpenedEventArgs());
             VisualStateManager.GoToState(this, LoadedState, true);
+            ImageExOpened?.Invoke(this, new ImageExOpenedEventArgs());
         }
 
         /// <summary>
@@ -177,8 +177,8 @@ protected virtual void OnImageOpened(object sender, RoutedEventArgs e)
         /// <param name="e">Event Arguments</param>
         protected virtual void OnImageFailed(object sender, ExceptionRoutedEventArgs e)
         {
-            ImageExFailed?.Invoke(this, new ImageExFailedEventArgs(new Exception(e.ErrorMessage)));
             VisualStateManager.GoToState(this, FailedState, true);
+            ImageExFailed?.Invoke(this, new ImageExFailedEventArgs(new Exception(e.ErrorMessage)));
         }
 
         private void ImageExBase_LayoutUpdated(object sender, object e)