[英]Collect a distinct list of key values from a nested collection?
This seems like it is completely straightforward, but my brain isn't working very well this morning, and I can't seem to find a good search expression for the answer. 这似乎很简单,但是今天早上我的大脑工作得不太好,而且我似乎找不到很好的搜索表达式作为答案。
I have an IList<IDictionary<string, string>>
and I want to get an IList<string>
containing a distinct list of unique key names in my collection of dictionary objects. 我有一个
IList<IDictionary<string, string>>
并且我想获取一个IList<string>
,该IList<string>
在我的字典对象集合中包含唯一键名称的不同列表。 What's a quick and elegant way to do this? 什么是快速而优雅的方法? I'm sure the answer is simple, I just can't think of it.
我敢肯定,答案很简单,我想不出来。
var allKeys = from dict in list
from key in dict.Keys
select key;
var distinctKeys = allKeys.Distinct().ToList();
Or if you prefer lambda syntax: 或者,如果您更喜欢lambda语法:
var distinctKeys = list.SelectMany(dict => dict.Keys).Distinct().ToList();
list.SelectMany(d => d.Keys).Distinct()
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.