AvalonStudio.ShellViewModel.RemoveDocument C# (CSharp) Метод

        public void RemoveDocument(IDocumentTabViewModel document)
        {
            IDocumentTabViewModel newSelectedTab = DocumentTabs.SelectedDocument;

            if (DocumentTabs.SelectedDocument == document)
            {
                if (DocumentTabs.SelectedDocument != DocumentTabs.Documents.Last())
                {
                    newSelectedTab = DocumentTabs.Documents.SkipWhile(d => d == document).FirstOrDefault();
                }
                else
                {
                    newSelectedTab = DocumentTabs.Documents.Reverse().Skip(1).FirstOrDefault();
                }
            }

            DocumentTabs.SelectedDocument = newSelectedTab;

            DocumentTabs.Documents.Remove(document);

            if (DocumentTabs.TemporaryDocument == document)
            {
                DocumentTabs.TemporaryDocument = null;
            }
        }