SqlQuery doesn't support Complex Type
What you should do is:
internal class TempResult
{
public int? EntityId { get; set; }
public string Name { get; set; }
public int? AddressId { get; set; }
public string Address1 { get; set; }
public string Address2 { get; set; }
public string Address3 { get; set; }
}
var tempResults = db.Database.SqlQuery<TempResult>(
@"SELECT e.entity_id AS EntityId, e.entity_reg_name AS Name,
a.address_1 AS [RegisteredAddress.Address1]
FROM
entity AS e
LEFT JOIN address AS a ON e.entity_reg_addr_id = a.address_id",
objectParameterList.ToArray()).ToList();
querySearchResult = tempResults.Select(t => new SearchResult
{
EntityId = t.EntityId,
[...]
RegisteredAddress = new Address
{
AddressId = t.AddressId,
[...]
}
}