Linq extension method, how to find child in collection recursive

Question

I\'m already familiar with Linq but have little understanding of extension methods I\'m hoping someone can help me out.

So I have this hierarchical collection pseudo cod

Answer 1

If you want to "sub-iterate" and find a child in a list of Products:

List
    Product
       Child
       Child
       Child
       Child
    Product
       Child
       Child *find this one
       Child

You can use the existing SelectMany extension method. SelectMany can be used to "flatten" a two-level hierarchy.

Here's a great explanation of SelectMany: http://team.interknowlogy.com/blogs/danhanan/archive/2008/10/10/use-linq-s-selectmany-method-to-quot-flatten-quot-collections.aspx

Your syntax would like like this:

List p = GetProducts(); //Get a list of products
var child = from c in p.SelectMany(p => p.Children).Where(c => c.Id == yourID);