public static Array Expand(Array a, int rowOffset = 0, int colOffset = 1, string refTxt = null)
{
ExcelThread xlt = ExcelThread.Current;
XlOper o = refTxt == null || refTxt == "" ? xlt.GetCaller() : xlt.Call(Excel.Functions.Indirect, refTxt);
var des = xlt.Call(Excel.Functions.Offset, o, rowOffset, colOffset, a.GetLength(0), a.GetLength(1));
Excel.AsyncRangeUpdate(xlt.RefText(des, false), a);
return(a);
//var app = Excel.Application;
//app.GetType().InvokeMember("Run", BindingFlags.InvokeMethod, null, app, new object[] { "QDefineRangeName", "hh" });
//object workbook = app.GetType().InvokeMember("ActiveWorkbook", BindingFlags.GetProperty, null, app, null);
//object properties = app.GetType().InvokeMember("BuiltinDocumentProperties", BindingFlags.GetProperty, null, workbook.GetType(), null);
//object property = app.GetType().InvokeMember("Item", BindingFlags.GetProperty, null, properties, new object[] { "Author" });
//object value = app.GetType().InvokeMember("Value", BindingFlags.GetProperty, null, property, null);
//xlt.CallPrivileged(Excel.Commands.DefineName, "hehe", "$A$2");
//xlt.CallUDF("QDefineRangeName", "hh");
}