C＃动态访问子级为IEnumerable

Question

I have the following dynamic object as IEnumerable of type dynamic

[{
    "id": 1,
    "subList": [
      {"specialId": 42}, 
      {"specialId": 27}
    ]
}, 
 {
    "id": 2,
    "subList": [
      {"specialId": 13}, 
      {"specialId": 14}
    ]
}]

I can get the objects into a IEnumerable of Dynamics and can run linq queries like the following

listOfDynamics.Where(x => x.id == 2);

However what I would like to do is be able to do is match on the subList

listOfDynamics.Where(x => ((IEnumerable)x.subList)).Where(y => y.specialId == 42));

so in the example above it would return the object with id of 1 but not the id of 2

Answer 1

In your Where you want to check if the subList contains any element with specialId == 42 :

listOfDynamics.Where(x => ((IEnumerable<dynamic>)x.subList).Any(y => y.specialId == 42));

So Any() is the method you want.

And you need to cast x.subList to IEnumerable<dynamic> instead of only IEnumerable (as suggested by @Ivan-Stoev and @Derked in the comments).