Question

I have a generic list.

Some elements of this list belong to a parent element. I retrieved all these elements from a database and i want to recursively build a tree with them.

So, here’s what i’m thinking:

Here is my predicate:

public static bool FindChildren(Int32 parentId,CategoryMapping catMapping)
{
    if (catMapping.parentId == parentId)
    {
        return true;
    }
    else
    {
        return false;
    }
}

root = list[0];
root.childrenElements = root.FindAll(FindChildren(root.id,???)

I can’t figure out how this would work. How can i do this kind of predicate?

PS: I’m using VS2005 🙁

Answer 1

Try

root.childrenElements = 
    root
       .Where( i => i.parentId == yourCatMapping.parentId)
       .ToArray();

EDIT

In .net 2.0 I think it is

root.FindAll(
    delegate(CategoryMapping mapping)
        {
             return mapping.parentId == root.Id;
        });