AvalonStudio.TextEditor.TextEditor.GetSelection C# (CSharp) Method

        private string GetSelection()
        {
            var selectionStart = SelectionStart;
            var selectionEnd = SelectionEnd;
            var start = Math.Min(selectionStart, selectionEnd);
            var end = Math.Max(selectionStart, selectionEnd);

            if (start == end || (TextDocument?.TextLength ?? 0) < end)
            {
                return "";
            }

            return TextDocument.GetText(start, end - start);
        }