Vfrdtyky

I have an existing class that, paired down, looks like this:

public class SiloNode

{

    public string Key { get; set; }

    public List<string> RelatedTopics { get; set; }

    public string Url { get; set; }

}

Key, is a unique key, while RelatedTopics contains a list of Keys that are related.

I maintain a list of these nodes:

List<SiloNode> MasterList = new List<SiloNode>();

I use a query to extract all the related topics then create some links later:

public static IEnumerable<SiloNode> RelatedNodes(this SiloNode root)

{

    return MasterList.Where(x => root.RelatedTopics.Contains(x.Key));

}

All of the above works.

However, I need to change RelatedTopics so that I can add some anchor text that is unique to the relationship.

So, first, I created two more classes:

public class RelatedNode

{

    public string AnchorText { get; set; }

    public string Key { get; set; }

}



public class NodeLink

{

    public NodeLink(string url, string text)

    {

        Url = url;

        Text = text;

    }



    public string Text { get; set; }

    public string Url { get; set; }

}

Then I make changes to my SiloNode class:

public class SiloNode

{

    public string Key { get; set; }

    public List<RelatedNode> RelatedTopics { get; set; }

    public string Url { get; set; }

}

So now, instead of RelatedTopics just containing a simple key, it also contains some anchor text that I would like to apply to that relationship.

Here's the bit where I'm struggling - the code below is incomplete:

public static IEnumerable<NodeLink> RelatedNodes(this SiloNode root)

{

    return MasterList.Where(x => root.RelatedTopics.Contains(x.Key))

        .Select(y => new NodeLink(y.Url, "HOW DO I GET ANCHOR TEXT?"));

}

I need to link the two sides together in such a way that I can access y.Url and root.RelatedTopics.Text.

I still need to match the related nodes but then project to a new NodeLink. While the key is available in 'x', the anchor text is in root.RelatedTopics. I assume that the current linq structure is insufficient to resolve this query but I'm no expert.

Any help appreciated.

Replace your Contains with Any, and add an inner Select:

masterList

 .Where(m => m.RelatedTopics.Any(t => m.Key == t.Key))

 .Select(m => m.RelatedTopics.Where(m.Key == t.Key)

                             .Select(t => new NodeLink(m.Url, t.AnchorText)));

Alternatively, do as follows:

masterList

 .Select(m => m.RelatedTopics

                 .Where(t => m.Key == t.Key)

                 .Select(t => new NodeLink(m.Url, t.AnchorText)));