Use default template to build for references.

Author: timcassell

src/BenchmarkDotNet/Toolchains/CsProj/CsProjGenerator.cs

@@ -81,6 +81,19 @@ protected override void GenerateBuildScript(BuildPartition buildPartition, Artif
 
         [SuppressMessage("ReSharper", "StringLiteralTypo")] // R# complains about $variables$
         protected override void GenerateProject(BuildPartition buildPartition, ArtifactsPaths artifactsPaths, ILogger logger)
+        {
+            File.WriteAllText(artifactsPaths.ProjectFilePath,
+                GenerateProject("CsProj.txt", buildPartition, artifactsPaths, logger)
+            );
+
+            // Integration tests are built without dependencies, so we skip gathering dlls.
+            if (!buildPartition.ForcedNoDependenciesForIntegrationTests)
+            {
+                GatherReferences(buildPartition, artifactsPaths, logger);
+            }
+        }
+
+        private string GenerateProject(string template, BuildPartition buildPartition, ArtifactsPaths artifactsPaths, ILogger logger)
         {
             var benchmark = buildPartition.RepresentativeBenchmarkCase;
             var projectFile = GetProjectFilePath(benchmark.Descriptor.Type, logger);
@@ -89,7 +102,7 @@ protected override void GenerateProject(BuildPartition buildPartition, Artifacts
             xmlDoc.Load(projectFile.FullName);
             var (customProperties, sdkName) = GetSettingsThatNeedToBeCopied(xmlDoc, projectFile);
 
-            var content = new StringBuilder(ResourceHelper.LoadTemplate("CsProj.txt"))
+            return new StringBuilder(ResourceHelper.LoadTemplate(template))
                 .Replace("$PLATFORM$", buildPartition.Platform.ToConfig())
                 .Replace("$CODEFILENAME$", Path.GetFileName(artifactsPaths.ProgramCodePath))
                 .Replace("$CSPROJPATH$", projectFile.FullName)
@@ -99,33 +112,26 @@ protected override void GenerateProject(BuildPartition buildPartition, Artifacts
                 .Replace("$COPIEDSETTINGS$", customProperties)
                 .Replace("$SDKNAME$", sdkName)
                 .ToString();
-
-            File.WriteAllText(artifactsPaths.ProjectFilePath, content);
-
-            // Integration tests are built without dependencies, so we skip gathering dlls.
-            if (!buildPartition.ForcedNoDependenciesForIntegrationTests)
-            {
-                GatherReferences(buildPartition, artifactsPaths, logger);
-            }
         }
 
         private static string GetDllGathererPath(string filePath)
             => Path.Combine(Path.GetDirectoryName(filePath), $"DllGatherer{Path.GetExtension(filePath)}");
 
         protected void GatherReferences(BuildPartition buildPartition, ArtifactsPaths artifactsPaths, ILogger logger)
         {
-            // Copy csproj template without the generated C# file to build the original project for all necessary runtime dlls.
+            // Create a project using the default template to build the original project for all necessary runtime dlls.
             // We can't just build the original project directly because it could be a library project, so we need an exe project to reference it.
+            string gathererProject = GetDllGathererPath(artifactsPaths.ProjectFilePath);
             var xmlDoc = new XmlDocument();
-            xmlDoc.Load(artifactsPaths.ProjectFilePath);
+            xmlDoc.LoadXml(GenerateProject("CsProj.txt", buildPartition, artifactsPaths, logger));
             var projectElement = xmlDoc.DocumentElement;
+
+            // Replace the default C# file with an empty Main method to satisfy the exe build.
             var compileNode = projectElement.SelectSingleNode("ItemGroup/Compile");
             string emptyMainFile = GetDllGathererPath(artifactsPaths.ProgramCodePath);
             compileNode.Attributes["Include"].Value = emptyMainFile;
-            string gathererProject = GetDllGathererPath(artifactsPaths.ProjectFilePath);
             xmlDoc.Save(gathererProject);
 
-            // Generate a C# file with an empty Main method to satisfy the exe build.
             File.WriteAllText(emptyMainFile, """
                 namespace BenchmarkDotNet.Autogenerated
                 {