Microsoft.R.Editor.Document.REditorDocument.Close C# (CSharp) Method

        public virtual void Close() {
            if (IsClosed) {
                return;
            }

            IsClosed = true;
            _textDocumentFactoryService.TextDocumentDisposed -= OnTextDocumentDisposed;

            DocumentClosing?.Invoke(this, null);

            if (EditorTree != null) {
                _editorTree.Dispose(); // this will also remove event handlers
                _editorTree = null;
            }

            if (DocumentClosing != null) {
                foreach (EventHandler<EventArgs> eh in DocumentClosing.GetInvocationList()) {
                    Debug.Fail(String.Format(CultureInfo.CurrentCulture, "There are still listeners in the EditorDocument.OnDocumentClosing event list: {0}", eh.Target));
                    DocumentClosing -= eh;
                }
            }

            ServiceManager.RemoveService<REditorDocument>(TextBuffer);
            TextBuffer = null;
        }