Add an option to enable navigation to decompiled sources

src/EditorFeatures/Core/Implementation/MetadataAsSource/MetadataAsSourceFileService.cs

@@ -10,6 +10,7 @@
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.CSharp;
 using ICSharpCode.Decompiler.TypeSystem;
+using Microsoft.CodeAnalysis.Editor.Shared.Options;
 using Microsoft.CodeAnalysis.ErrorReporting;
 using Microsoft.CodeAnalysis.MetadataAsSource;
 using Microsoft.CodeAnalysis.Shared.Extensions;
@@ -112,11 +113,20 @@ public async Task<MetadataAsSourceFile> GetGeneratedFileAsync(Project project, I
                     var temporaryDocument = _workspace.CurrentSolution.AddProject(temporaryProjectInfoAndDocumentId.Item1)
                                                                      .GetDocument(temporaryProjectInfoAndDocumentId.Item2);
 
-                    try
+                    var useDecompiler = project.Solution.Workspace.Options.GetOption(FeatureOnOffOptions.NavigateToDecompiledSources);
+                    if (useDecompiler)
                     {
-                        temporaryDocument = await DecompileSymbolAsync(temporaryDocument, symbol, cancellationToken).ConfigureAwait(false);
+                        try
+                        {
+                            temporaryDocument = await DecompileSymbolAsync(temporaryDocument, symbol, cancellationToken).ConfigureAwait(false);
+                        }
+                        catch (Exception e) when (FatalError.ReportWithoutCrashUnlessCanceled(e))
+                        {
+                            useDecompiler = false;
+                        }
                     }
-                    catch (Exception e) when (FatalError.ReportWithoutCrashUnlessCanceled(e))
+
+                    if (!useDecompiler)
                     {
                         var sourceFromMetadataService = temporaryDocument.Project.LanguageServices.GetService<IMetadataAsSourceService>();
                         temporaryDocument = await sourceFromMetadataService.AddSourceToAsync(temporaryDocument, symbol, cancellationToken).ConfigureAwait(false);

src/EditorFeatures/Core/Shared/Options/FeatureOnOffOptions.cs

@@ -78,6 +78,12 @@ internal static class FeatureOnOffOptions
 
         public static readonly PerLanguageOption<bool> StreamingGoToImplementation = new PerLanguageOption<bool>(
             nameof(FeatureOnOffOptions), nameof(StreamingGoToImplementation), defaultValue: true);
+
+        private const string LocalRegistryPath = @"Roslyn\Features\";
+
+        public static readonly Option<bool> NavigateToDecompiledSources = new Option<bool>(
+            nameof(FeatureOnOffOptions), nameof(NavigateToDecompiledSources), defaultValue: false,
+            storageLocations: new LocalUserProfileStorageLocation(LocalRegistryPath + nameof(NavigateToDecompiledSources)));
     }
 
     [ExportOptionProvider, Shared]

src/VisualStudio/CSharp/Impl/Options/AdvancedOptionPageControl.xaml

@@ -19,6 +19,8 @@
                               Content="{x:Static local:AdvancedOptionPageStrings.Option_Enable_full_solution_analysis}" />
                     <CheckBox x:Name="Perform_editor_feature_analysis_in_external_process"
                               Content="{x:Static local:AdvancedOptionPageStrings.Option_Perform_editor_feature_analysis_in_external_process}" />
+                    <CheckBox x:Name="Enable_navigation_to_decompiled_sources"
+                              Content="{x:Static local:AdvancedOptionPageStrings.Option_Enable_navigation_to_decompiled_sources}" />
                 </StackPanel>
             </GroupBox>
             <GroupBox x:Uid="UsingDirectivesGroupBox"

src/VisualStudio/CSharp/Impl/Options/AdvancedOptionPageControl.xaml.cs

@@ -24,6 +24,7 @@ public AdvancedOptionPageControl(IServiceProvider serviceProvider) : base(servic
 
             BindToFullSolutionAnalysisOption(Enable_full_solution_analysis, LanguageNames.CSharp);
             BindToOption(Perform_editor_feature_analysis_in_external_process, RemoteFeatureOptions.OutOfProcessAllowed);
+            BindToOption(Enable_navigation_to_decompiled_sources, FeatureOnOffOptions.NavigateToDecompiledSources);
 
             BindToOption(PlaceSystemNamespaceFirst, GenerationOptions.PlaceSystemNamespaceFirst, LanguageNames.CSharp);
             BindToOption(SeparateImportGroups, GenerationOptions.SeparateImportDirectiveGroups, LanguageNames.CSharp);

src/VisualStudio/CSharp/Impl/Options/AdvancedOptionPageStrings.cs

@@ -18,6 +18,9 @@ public static string Option_Enable_full_solution_analysis
         public static string Option_Perform_editor_feature_analysis_in_external_process
             => ServicesVSResources.Perform_editor_feature_analysis_in_external_process;
 
+        public static string Option_Enable_navigation_to_decompiled_sources
+            => ServicesVSResources.Enable_navigation_to_decompiled_sources;
+
         public static string Option_RenameTrackingPreview => CSharpVSResources.Show_preview_for_rename_tracking;
         public static string Option_Split_string_literals_on_enter => CSharpVSResources.Split_string_literals_on_enter;
 

src/VisualStudio/Core/Def/ServicesVSResources.Designer.cs

@@ -696,6 +696,15 @@ internal class ServicesVSResources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Enable navigation to decompiled sources (experimental).
+        /// </summary>
+        internal static string Enable_navigation_to_decompiled_sources {
+            get {
+                return ResourceManager.GetString("Enable_navigation_to_decompiled_sources", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to --- End of inner exception stack trace ---.
         /// </summary>

src/VisualStudio/Core/Def/ServicesVSResources.resx

@@ -977,4 +977,7 @@ Additional information: {1}</value>
   <data name="Search_found_no_results" xml:space="preserve">
     <value>Search found no results</value>
   </data>
+  <data name="Enable_navigation_to_decompiled_sources" xml:space="preserve">
+    <value>Enable navigation to decompiled sources (experimental)</value>
+  </data>
 </root>
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