Using LINQ how do I create a List of one particular field of an entity from a collection entities

Question

If I have the following collection

IEnumerable<ProviderOrganisation> listOfProviders

public class ProviderOrganisation
{
    public virtual string Code { get; set; }
    public virtual string Description { get; set; }
    public virtual int SortOrder { get; set; }
    public virtual bool IsDefault { get; set; }
    public virtual DateTime EffectiveStartDate { get; set; }
    public virtual DateTime? EffectiveEndDate { get; set; }
}

how do I write the LINQ to produce a collection of just Codes please?

So, just a List of the Codes:

List<string> listOfCodes

Thanks

Answer 1

Use Enumerable.Select and Enumerable.ToList.

List<String> listOfCodes = listOfProviders
                     .Select(p => p.Code)
                     .ToList();

Answer 2

You can call the Select() method to pull out only the property you need. Then call ToList() to cast it.

listOfProviders.Select(p => p.Code).ToList();