/// <summary>
/// 选择TJoin关联值到对象内部索引
/// 可调用多次,不要重复
/// </summary>
/// <param name="resultSelector"></param>
/// <returns></returns>
public LambdaQueryJoin <T, T2> SelectAppendValue <TResult>(Expression <Func <T, T2, TResult> > resultSelector)
{
BaseQuery.__SelectAppendValue(resultSelector.Parameters, resultSelector.Body);
return(this);
}