CODEWITHSUNDEEP
c#
Charlie Swanson
Charlie Swanson

Reputation: 31

Converting Dictionary<Int, Object> To Dictionary<Int, Object.Property> with lambdas

Suppose I have a class Building with properties int Id, int Height, int NumberOfFloors.

If I have a Dictionary, where each key is the building id. Is there a way to convert this into a Dictionary where each key is the building Id, and each value is the number of floors. Obviously this is feasible with a loop. Just wondering if there is a simple way to do this using lambdas?

Thanks!

var intToBuilding = new Dictionary<int, Building>(); //pretend populated
var intToInt = new Dictionary<int, int>();
foreach(var intBuilding in intToBuilding)
{
  var building = userPreference.Value;
  intToInt.Add(intBuilding.Key, building.Height);
}

Upvotes: 1

Views: 594

Answers (1)

Henk Holterman
Henk Holterman

Reputation: 273219

It should go something like:

var floorDictionary = buildingDictionary
   .ToDictionary(kv => kv.Key, kv => kv.Value.NumberofFloors);

The source dictionary implements IEnumerable< KeyValuePair<TKey, TValue> > and for that there is an extension method ToDictionary(keySelector, valueSelector).

Upvotes: 5

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