My database looks like that: (it's pseudocode)
public class thread
{
int id;
List<Post> Posts;
}
public class Post
{
int id;
}
As input, i have post id, and i want to know in what thread is that post. Can i do it with extension methods for linq?
I think you mean the following:
var myThread = threads.FirstOrDefault(x => x.Posts.Any(p => p.id == somePostId));
This would return the first (if any) matching thread
instance which contains a post with the given post id or null
if no instance matches. This assumes you have a collection threads
of thread
instances exposed e.g. using Linq to Entities.
In general I would try to avoid class names that conflict with existing class names in the .NET framework (like Thread
).