readonly, updated comments

src/VisualStudio/Core/Def/Implementation/ProjectSystem/MiscellaneousFilesWorkspace.cs

@@ -129,13 +129,13 @@ public int OnAfterAttributeChangeEx(uint docCookie, uint grfAttribs, IVsHierarch
                 // 2) the old file was a different extension that we weren't tracking, which may have now changed
                 if (TryUntrackClosingDocument(docCookie, pszMkDocumentOld) || TryGetLanguageInformation(pszMkDocumentOld) == null)
                 {
-                    // Add the new one, if appropriate. 
+                    // Add the new one, if appropriate.
                     TrackOpenedDocument(docCookie, pszMkDocumentNew);
                 }
             }
 
-            // When starting a diff, the RDT doesn't call OnBeforeDocumentWindowShow, but it does call 
-            // OnAfterAttributeChangeEx for the temporary buffer. The native IDE used this even to 
+            // When starting a diff, the RDT doesn't call OnBeforeDocumentWindowShow, but it does call
+            // OnAfterAttributeChangeEx for the temporary buffer. The native IDE used this even to
             // add misc files, so we'll do the same.
             if ((grfAttribs & (uint)__VSRDTATTRIB.RDTA_DocDataReloaded) != 0)
             {
@@ -200,7 +200,7 @@ private void TrackOpenedDocument(uint docCookie, string moniker)
                 return;
             }
 
-            // We don't want to realize the document here unless it's already initialized. Document initialization is watched in 
+            // We don't want to realize the document here unless it's already initialized. Document initialization is watched in
             // OnAfterAttributeChangeEx and will retrigger this if it wasn't already done.
             if (_runningDocumentTable.IsDocumentInitialized(docCookie) && !_docCookieToWorkspaceRegistration.ContainsKey(docCookie))
             {
@@ -354,8 +354,8 @@ private ProjectInfo CreateProjectInfoForDocument(string filePath)
             var languageServices = Services.GetLanguageServices(languageInformation.LanguageName);
             var compilationOptionsOpt = languageServices.GetService<ICompilationFactoryService>()?.GetDefaultCompilationOptions();
 
-            // We only have one code file without project file here, so we cannot find out language version of the project  
-            // Use latest language version which is more permissive. https://devdiv.visualstudio.com/DevDiv/_workitems/edit/575761  
+            // Use latest language version which is more permissive, as we cannot find out language version of the project which the file belongs to
+            // https://devdiv.visualstudio.com/DevDiv/_workitems/edit/575761
             var parseOptionsOpt = languageServices.GetService<ISyntaxTreeFactoryService>()?.GetDefaultParseOptionsWithLatestLanguageVersion();
 
             if (parseOptionsOpt != null &&
@@ -372,7 +372,7 @@ private ProjectInfo CreateProjectInfoForDocument(string filePath)
 
                 var baseDirectory = PathUtilities.GetDirectoryName(filePath);
 
-                // TODO (https://github.com/dotnet/roslyn/issues/5325, https://github.com/dotnet/roslyn/issues/13886): 
+                // TODO (https://github.com/dotnet/roslyn/issues/5325, https://github.com/dotnet/roslyn/issues/13886):
                 // - Need to have a way to specify these somewhere in VS options.
                 // - Use RuntimeMetadataReferenceResolver like in InteractiveEvaluator.CreateMetadataReferenceResolver
                 // - Add default namespace imports, default metadata references to match csi.rsp

src/Workspaces/CSharp/Portable/LanguageServices/CSharpSyntaxTreeFactoryService.cs

@@ -15,7 +15,7 @@ namespace Microsoft.CodeAnalysis.CSharp
     [ExportLanguageServiceFactory(typeof(ISyntaxTreeFactoryService), LanguageNames.CSharp), Shared]
     internal partial class CSharpSyntaxTreeFactoryServiceFactory : ILanguageServiceFactory
     {
-        private static CSharpParseOptions _parseOptionWithLatestLanguageVersion = CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.Latest);
+        private static readonly CSharpParseOptions _parseOptionWithLatestLanguageVersion = CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.Latest);
 
         public ILanguageService CreateLanguageService(HostLanguageServices provider)
         {

src/Workspaces/VisualBasic/Portable/LanguageServices/VisualBasicSyntaxTreeFactoryService.vb

@@ -14,7 +14,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
     Partial Friend Class VisualBasicSyntaxTreeFactoryServiceFactory
         Implements ILanguageServiceFactory
 
-        Private Shared _parseOptionsWithLatestLanguageVersion As VisualBasicParseOptions = VisualBasicParseOptions.Default.WithLanguageVersion(LanguageVersion.Latest)
+        Private Shared ReadOnly _parseOptionsWithLatestLanguageVersion As VisualBasicParseOptions = VisualBasicParseOptions.Default.WithLanguageVersion(LanguageVersion.Latest)
 
 
         Public Function CreateLanguageService(provider As HostLanguageServices) As ILanguageService Implements ILanguageServiceFactory.CreateLanguageService