ISelectListProvider implementation example

CommunitySelectListProvider.cs

public class CommunitySelectListProvider : ISelectListProvider
{
    private readonly IGetCommunitiesQuery _getCommunitiesQuery;

    public CommunitySelectListProvider(IGetCommunitiesQuery getCommunitiesQuery)
    {
        _getCommunitiesQuery = getCommunitiesQuery;
    }

    public IEnumerable<SelectListItem> Provide()
    {
        var communities = _getCommunitiesQuery.Execute();

        return communities.Select(community => new SelectListItem { Text = community.Name, Value = community.CommunityId.ToString() }).ToList();
    }
}