CODEWITHSUNDEEP
c#.netlinqentity-framework
Antoine Meltzheim
Antoine Meltzheim

Reputation: 9924

How to perform a Distinct on EntityObject List

Distinct() can't be apply on some Entities cause some fields can't be hashed (as text field).

Upvotes: 1

Views: 73

Answers (1)

Antoine Meltzheim
Antoine Meltzheim

Reputation: 9924

After all when Distinct is needed on an EntityObject we only need comparison to be made on the entity key. IEqualityComparer can be implemented like so :

public class EntityObComparer : IEqualityComparer<EntityObject>
{
    public bool Equals(EntityObject x, EntityObject y)
    {
        return x.EntityKey.Equals(y.EntityKey);
    }

    public int GetHashCode(EntityObject obj)
    {
        return obj.GetHashCode();
    }
}

Then distinct can be perform like so :

var foo = MyListOfEntityObjects.Distinct(new EntityObComparer());

Upvotes: 1

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