检查列表< List< int> []>.包含使用Linq的值 [英] Check a List<List<int>[]> contains a value using Linq
问题描述
我有一个 List< List< int> []>
,其中包含列表项,例如
I have a List<List<int>[]>
containing lists items e.g
List<int> a= new List<int>(){ 2, 2, 3, 4, 5};
List<int> b= new List<int>() { 2, 2, 2, 6 };
List<List<int>[]> c = new List<List<int>[]>();
c.Add(new[]{a,b});
我想检查c中包含的任何数组的值是否为2.这或多或少是对还是错.
I want to check if any of the arrays contained in c have 2 as a value . This is more or less a true or false answer.
到目前为止,我可以使用Linq代码检查a或b是否包含2
So far I can check if a or b contains 2 using the Linq code
var result = a.Any(p=> p==2); // this outputs 2
将此扩展到c
var result=c.Any(p=> p.Select(value => value.Contains(2)).First());
//上面的代码p => p.Select(value => value.Contains(2))返回一个Enumerable,我取第一个.我不太肯定这是使用linq解决此问题的正确方法.有更好的方法吗?
// the above code p=> p.Select(value => value.Contains(2)) returns an Enumerable and I take the first one. I'm not positive this is the right way to go about this problem using linq. Is there a better way of doing this?
推荐答案
如果您知道如何在单个列表中进行搜索,则应该能够以完全相同的方式在列表中进行搜索.只需使用 SelectMany
并使用相同的条件.
If you know how to search in a single list, you should be able to search in list of lists exactly the same way. Just flatten it with SelectMany
and use the same criteria.
对于您的情况,如果这是单个列表:
For your case, if this is for single list:
var result = a.Any(p => p == 2);
然后是列表列表:
var result = c.SelectMany(x => x).Any(p => p == 2);
并与您的示例中的第三级类似:
and similar for third level as in your example:
var result = c.SelectMany(x => x).SelectMany(x => x).Any(p => p == 2);
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