Merge pull request #31254 from genlu/propertyApi

Add an API to pass additional msbuild properties to workspace

src/VisualStudio/Core/Def/Implementation/ProjectSystem/CPS/AdditionalPropertyNames.cs

+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+namespace Microsoft.VisualStudio.LanguageServices.ProjectSystem
+{
+    /// <summary>
+    /// A class that provides constants for common MSBuild property names.
+    /// </summary>
+    internal static class AdditionalPropertyNames
+    {
+        public const string RootNamespace = "rootnamespace";
+    }
+}

src/VisualStudio/Core/Def/Implementation/ProjectSystem/CPS/IWorkspaceProjectContext.cs

@@ -23,6 +23,9 @@ internal interface IWorkspaceProjectContext : IDisposable
         // Options.
         void SetOptions(string commandLineForOptions);
 
+        // Other project properties.
+        void SetProperty(string name, string value);
+
         // References.
         void AddMetadataReference(string referencePath, MetadataReferenceProperties properties);
         void RemoveMetadataReference(string referencePath);

src/VisualStudio/Core/Impl/ProjectSystem/CPS/CPSProject_IWorkspaceProjectContext.cs

@@ -133,6 +133,11 @@ public void SetOptions(string commandLineForOptions)
             }
         }
 
+        public void SetProperty(string name, string value)
+        {
+            // TODO
+        }
+
         public void AddMetadataReference(string referencePath, MetadataReferenceProperties properties)
         {
             referencePath = FileUtilities.NormalizeAbsolutePath(referencePath);