在 C# 中过滤集合 [英] Filtering collections in C#
问题描述
我正在寻找一种非常快速的方法来过滤 C# 中的集合.我目前正在使用通用 List
I am looking for a very fast way to filter down a collection in C#. I am currently using generic List<object> collections, but am open to using other structures if they perform better.
目前，我只是在创建一个新的 List
Currently, I am just creating a new List<object> and looping thru the original list. If the filtering criteria matches, I put a copy into the new list.
有没有更好的方法来做到这一点?有没有办法就地过滤，这样就不需要临时列表?
Is there a better way to do this? Is there a way to filter in place so there is no temporary list required?
推荐答案
如果您使用的是 C# 3.0，您可以使用 linq，它更好、更优雅:
If you're using C# 3.0 you can use linq, which is way better and way more elegant:
List<int> myList = GetListOfIntsFromSomewhere();
// This will filter ints that are not > 7 out of the list; Where returns an
// IEnumerable<T>, so call ToList to convert back to a List<T>.
List<int> filteredList = myList.Where(x => x > 7).ToList();
如果找不到.Where，则意味着您需要在文件顶部导入using System.Linq;.
If you can't find the .Where, that means you need to import using System.Linq; at the top of your file.
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