Update App.xaml.cs (#2230)

Implemented guard clause to improve readability of OnActivated

Author: philliprobinson

src/Calculator/App.xaml.cs

@@ -73,25 +73,24 @@ protected override void OnLaunched(LaunchActivatedEventArgs args)
 
         protected override void OnActivated(IActivatedEventArgs args)
         {
-            if (args.Kind == ActivationKind.Protocol)
+            if (args.Kind != ActivationKind.Protocol) return;
+            
+            if (args.IsSnapshotProtocol())
             {
-                if (args.IsSnapshotProtocol())
-                {
-                    var protoArgs = (IProtocolActivatedEventArgs)args;
-                    OnAppLaunch(args,
-                        new SnapshotLaunchArguments
-                        {
-                            ActivityId = protoArgs.Uri.GetActivityId(),
-                            LaunchUri = protoArgs.Uri
-                        },
-                        false);
-                }
-                else
-                {
-                    // handle any unknown protocol launch as a normal app launch.
-                    OnAppLaunch(args, null, false);
-                }
+                var protoArgs = (IProtocolActivatedEventArgs)args;
+                OnAppLaunch(args,
+                    new SnapshotLaunchArguments
+                    {
+                        ActivityId = protoArgs.Uri.GetActivityId(),
+                        LaunchUri = protoArgs.Uri
+                    },
+                    false);
             }
+            else
+            {
+                // handle any unknown protocol launch as a normal app launch.
+                OnAppLaunch(args, null, false);
+            }            
         }
 
         private void OnAppLaunch(IActivatedEventArgs args, object arguments, bool isPreLaunch)