C# select from list by object type

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Structure of my project:

class Attachment { ... }
class Photo : Attachment { ... }
class Document : Attachment { ... }

class Page
{
    public List<Attachment> attachments;
                ...
}

I receive pages from the server:

List<Page> pages = ...load pages from server;

I need to get from this list pages which in the Attachments have only objects with type Photo.

How can I do it? Thanks.

asked 40 secs ago

Pavel

13

C# select from list by object type