LINQ query for Dictionary items in C#

Question

I have a Dictionary where on of the members of DetailedObject is a List. I am trying to write a query against the Dictionary to return all of the items where the DetailedObject has a specific value for one of the fields in it's SubStructure. For example:

public struct SubStructure
{
  public int Id;
  public string SubSpecificFile;
}

public class DetailedObject  
{
  public int Id;
  public List<SubStructure> subs = new List<SubStructure>();
}

public Dictionary<int, DetailedObject> dict = new Dictionary<string, DetailedObject>();

Each SubStructure can appear inside zero or more DetailedObject instances.

I would, for example, like to query "dict" for each DetailedObject whose "subs" collection contains a SubStructure item with the Id of 3.

Using a struct because it is only going to contain data. No additional processing required. — Robert Lancaster
– Robert Lancaster, Commented Aug 1, 2011 at 13:51

spender · Accepted Answer · 2011-08-01 11:32:32Z

7

dict.Values.Where(d => d.subs.Any(ss => ss.Id == 3))

answered Aug 1, 2011 at 11:32

spender

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2 Comments

Zebi Over a year ago

This way you miss the Key of each dictionary entry.

spender Over a year ago

Quoting OP: 'query "dict" for each DetailedObject'... no requirement to get the key.

Bala R · Accepted Answer · 2011-08-01 11:36:01Z

6

var result = dict1.Where(kvp => kvp.Value.subs.Any(ss => ss.Id == 3));

answered Aug 1, 2011 at 11:36

Bala R

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2 Comments

Zebi Over a year ago

If you add ToDictionary(x => x.Key, x => x.Value) to the end you end up with a dictionary again.

Xarylem Over a year ago

what if I want to get a collection (e.g. .ToList()) of the 'SubSpecificFile' variables related with Id ==3 ?

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