Roslyn Rename

rename.cs

        public RosylnController()
        {
            _workspace = new AdhocWorkspace();
            _project = _workspace.AddProject("AdhocProject", LanguageNames.CSharp);
        }

        [Route("rename")]
        public async Task<string> Post(string buffer, int line, int column, string newName)
        {
            var document = _project.AddDocument("AdhocDocument", SourceText.From(buffer));
            var sourceText = await document.GetTextAsync();
            var symbolPosition = sourceText.Lines.GetPosition(new LinePosition(line, column));
            var symbol = await SymbolFinder.FindSymbolAtPositionAsync(document, symbolPosition);

            if (symbol != null)
            {
                var newSolution = await Renamer.RenameSymbolAsync(_workspace.CurrentSolution, symbol, newName, _workspace.Options);

                var solutionChanges = newSolution.GetChanges(_workspace.CurrentSolution);

                var projectChanges = solutionChanges.GetProjectChanges();
                var documentChanges = projectChanges.First().GetChangedDocuments();
                var changedDocument = newSolution.GetDocument(documentChanges.First());

                var newSourceText = await changedDocument.GetTextAsync();
                return newSourceText.ToString();
            }

            return null;
        }