选择IEnumerable< object>.来自IEnumerable< IEnumerable<对象>林克 [英] Select IEnumerable<object> from IEnumerable<IEnumerable<object>> linq

问题描述

我需要做的是选择嵌套元素列表，这是我的查询，returns IEnumerable<IEnumerable<object>>这是我的linq表达式:

What I need to do is select list of nested elements, here is my query which returns IEnumerable<IEnumerable<object>> here is my linq expression:

from a in (questions.Select(x => x.AnswerList).ToList())
                           select a.Select(x => x.AnswerBasicViewModel);

我该怎么做才能使其仅return而不是IEnumerable<IEnumerable<object>>?

How should I do that to make it return only IEnumerable<object> instead of IEnumerable<IEnumerable<object>>?

在我的样本中请弄清楚，我想得到IEnumerable<AnswerBasicViewModel>.

Just to be clear in my sample I would like to get IEnumerable<AnswerBasicViewModel>.

推荐答案

使用SelectMany运算符:

from q in questions
from a in q.AnswerList
select a.AnswerBasicViewModel

或者简单地

questions.SelectMany(q => q.AnswerList)
         .Select(a => a.AnswerBasicViewModel)

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