Disable exports and menus that would crash Blend

Only enable some exports and menus when running inside the Visual Studio process.
The extension is now effectively disbled when running inside Blend.

Author: jcansdale

src/GitHub.VisualStudio/GitHubPackage.cs

@@ -57,6 +57,11 @@ protected override async Task InitializeAsync(CancellationToken cancellationToke
         async Task InitializeMenus()
         {
             var menus = await GetServiceAsync(typeof(IMenuProvider)) as IMenuProvider;
+            if (menus == null)
+            {
+                // Ignore if null because Expression Blend doesn't support custom services or menu extensibility.
+                return;
+            }
 
             await ThreadingHelper.SwitchToMainThreadAsync();
 

src/GitHub.VisualStudio/Menus/MenuProvider.cs

@@ -1,4 +1,5 @@
-using GitHub.Services;
+using GitHub.Exports;
+using GitHub.Services;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.ComponentModel.Composition;
@@ -14,7 +15,7 @@ namespace GitHub.VisualStudio.Menus
     /// redirects every request to the actual service, and can be
     /// thrown away as soon as the caller is done (no state is kept)
     /// </summary>
-    [Export(typeof(IMenuProvider))]
+    [ExportForProcess(typeof(IMenuProvider), "devenv")]
     [PartCreationPolicy(CreationPolicy.NonShared)]
     public class MenuProviderDispatcher : IMenuProvider
     {

src/GitHub.VisualStudio/Services/GitHubServiceProvider.cs

@@ -11,6 +11,7 @@
 using System.Reactive.Linq;
 using GitHub.Infrastructure;
 using GitHub.Models;
+using GitHub.Exports;
 using GitHub.Services;
 using GitHub.UI;
 using Microsoft.VisualStudio.ComponentModelHost;
@@ -28,7 +29,7 @@ namespace GitHub.VisualStudio
     /// redirects every request to the actual service, and can be
     /// thrown away as soon as the caller is done (no state is kept)
     /// </summary>
-    [Export(typeof(IGitHubServiceProvider))]
+    [ExportForProcess(typeof(IGitHubServiceProvider), "devenv")]
     [PartCreationPolicy(CreationPolicy.NonShared)]
     [NullGuard(ValidationFlags.None)]
     public class GitHubProviderDispatcher : IGitHubServiceProvider

src/GitHub.VisualStudio/Services/LoginManagerDispatcher.cs

@@ -2,14 +2,15 @@
 using System.ComponentModel.Composition;
 using System.Threading.Tasks;
 using GitHub.Api;
+using GitHub.Exports;
 using GitHub.Primitives;
 using Microsoft.VisualStudio.Shell;
 using Octokit;
 using Task = System.Threading.Tasks.Task;
 
 namespace GitHub.Services
 {
-    [Export(typeof(ILoginManager))]
+    [ExportForProcess(typeof(ILoginManager), "devenv")]
     [PartCreationPolicy(CreationPolicy.NonShared)]
     public class LoginManagerDispatcher : ILoginManager
     {

src/GitHub.VisualStudio/Services/UsageTrackerDispatcher.cs

@@ -2,10 +2,11 @@
 using System;
 using System.ComponentModel.Composition;
 using Task = System.Threading.Tasks.Task;
+using GitHub.Exports;
 
 namespace GitHub.Services
 {
-    [Export(typeof(IUsageTracker))]
+    [ExportForProcess(typeof(IUsageTracker), "devenv")]
     [PartCreationPolicy(CreationPolicy.NonShared)]
     public class UsageTrackerDispatcher : IUsageTracker
     {