Ensure built before conversion

Relates to #592

Author: GrahamTheCoder

Vsix/CodeConversion.cs

@@ -53,6 +53,7 @@ public CodeConversion(IAsyncServiceProvider serviceProvider,
         public async Task ConvertProjectsAsync<TLanguageConversion>(IReadOnlyCollection<Project> selectedProjects, CancellationToken cancellationToken) where TLanguageConversion : ILanguageConversion, new()
         {
             try {
+                await EnsureBuiltAsync();
                 await _joinableTaskFactory.RunAsync(async () => {
                     var convertedFiles = ConvertProjectUnhandled<TLanguageConversion>(selectedProjects, cancellationToken);
                     await WriteConvertedFilesAndShowSummaryAsync(convertedFiles);
@@ -67,6 +68,7 @@ await _joinableTaskFactory.RunAsync(async () => {
         public async Task ConvertDocumentAsync<TLanguageConversion>(string documentFilePath, Span selected, CancellationToken cancellationToken) where TLanguageConversion : ILanguageConversion, new()
         {
             try {
+                await EnsureBuiltAsync();
                 var conversionResult = await _joinableTaskFactory.RunAsync(async () => {
                     var result = await ConvertDocumentUnhandledAsync<TLanguageConversion>(documentFilePath, selected, cancellationToken);
                     await WriteConvertedFilesAndShowSummaryAsync(new[] { result }.ToAsyncEnumerable());
@@ -85,6 +87,15 @@ await _joinableTaskFactory.RunAsync(async () => {
             }
         }
 
+        /// <remarks>
+        /// https://github.com/icsharpcode/CodeConverter/issues/592
+        /// https://github.com/dotnet/roslyn/issues/6615
+        /// </remarks>
+        private async Task EnsureBuiltAsync()
+        {
+            await VisualStudioInteraction.EnsureBuiltAsync(m => _outputWindow.WriteToOutputWindowAsync(m));
+        }
+
         private static async Task SetClipboardTextOnUiThreadAsync(string conversionResultConvertedCode)
         {
             await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync();

Vsix/VisualStudioInteraction.cs

@@ -135,6 +135,18 @@ public static async Task<bool> ShowMessageBoxAsync(IAsyncServiceProvider service
             return userAnswer == MessageBoxResult.OK;
         }
 
+        public static async Task EnsureBuiltAsync(Func<string, Task> writeMessageAsync)
+        {
+            await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync(CancelAllToken);
+            var build = Dte.Solution.SolutionBuild;
+            if (build.BuildState == vsBuildState.vsBuildStateInProgress) {
+                throw new InvalidOperationException("Build in progress, please wait for it to complete before conversion.");
+            }
+            await writeMessageAsync("Building solution prior to conversion for maximum accuracy...");
+            build.Build(true);
+            await TaskScheduler.Default;
+        }
+
         public static async Task WriteStatusBarTextAsync(IAsyncServiceProvider serviceProvider, string text)
         {
             await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync(CancelAllToken);