/// <summary>
/// 联合查询
/// 会清除父查询的排序
/// </summary>
/// <typeparam name="TResult2"></typeparam>
/// <param name="resultSelect"></param>
/// <param name="unionType"></param>
/// <returns></returns>
public LambdaQueryResultSelect <TResult> Union <TResult2>(LambdaQueryResultSelect <TResult2> resultSelect, UnionType unionType = UnionType.UnionAll)
{
BaseQuery.__QueryOrderBy = "";//清除OrderBy
BaseQuery.AddUnion(resultSelect.BaseQuery, unionType);
return(this);
}