Allow Razor to create a formatting options, and send them to OOP (#79458)

Author: davidwengier

src/Tools/ExternalAccess/Razor/Features/RazorCSharpFormattingInteractionService.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Threading;
@@ -23,6 +22,14 @@ namespace Microsoft.CodeAnalysis.ExternalAccess.Razor
     /// </summary>
     internal static class RazorCSharpFormattingInteractionService
     {
+        public static RazorCSharpSyntaxFormattingOptions GetRazorCSharpSyntaxFormattingOptions(SolutionServices services)
+        {
+            var legacyOptionsService = services.GetService<ILegacyGlobalOptionsWorkspaceService>();
+            var options = legacyOptionsService?.GetSyntaxFormattingOptions(services.GetLanguageServices(LanguageNames.CSharp))
+                ?? CSharpSyntaxFormattingOptions.Default;
+            return new RazorCSharpSyntaxFormattingOptions((CSharpSyntaxFormattingOptions)options);
+        }
+
         /// <summary>
         /// Returns the text changes necessary to format the document after the user enters a 
         /// character.  The position provided is the position of the caret in the document after

src/Tools/ExternalAccess/Razor/Features/RazorCSharpSyntaxFormattingOptions.cs

@@ -3,6 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using System.Runtime.Serialization;
 using Microsoft.CodeAnalysis.CodeStyle;
 using Microsoft.CodeAnalysis.CSharp.Formatting;
 
@@ -11,17 +12,18 @@ namespace Microsoft.CodeAnalysis.ExternalAccess.Razor.Features
     /// <summary>
     /// Wrapper for CSharpSyntaxFormattingOptions for Razor external access.
     /// </summary>
+    [DataContract]
     internal sealed record class RazorCSharpSyntaxFormattingOptions(
-        RazorSpacePlacement Spacing,
-        RazorBinaryOperatorSpacingOptions SpacingAroundBinaryOperator,
-        RazorNewLinePlacement NewLines,
-        RazorLabelPositionOptions LabelPositioning,
-        RazorIndentationPlacement Indentation,
-        bool WrappingKeepStatementsOnSingleLine,
-        bool WrappingPreserveSingleLine,
-        RazorNamespaceDeclarationPreference NamespaceDeclarations,
-        bool PreferTopLevelStatements,
-        int CollectionExpressionWrappingLength)
+        [property: DataMember] RazorSpacePlacement Spacing,
+        [property: DataMember] RazorBinaryOperatorSpacingOptions SpacingAroundBinaryOperator,
+        [property: DataMember] RazorNewLinePlacement NewLines,
+        [property: DataMember] RazorLabelPositionOptions LabelPositioning,
+        [property: DataMember] RazorIndentationPlacement Indentation,
+        [property: DataMember] bool WrappingKeepStatementsOnSingleLine,
+        [property: DataMember] bool WrappingPreserveSingleLine,
+        [property: DataMember] RazorNamespaceDeclarationPreference NamespaceDeclarations,
+        [property: DataMember] bool PreferTopLevelStatements,
+        [property: DataMember] int CollectionExpressionWrappingLength)
     {
         public static readonly RazorCSharpSyntaxFormattingOptions Default = new();