/// <summary>
/// Casts an identity instance to a more specific entity type.
/// </summary>
/// <param name="identity">The input identity.</param>
/// <typeparam name="TCast">The entity type for which to cast the identity.</typeparam>
public static IIdentity <TCast> Cast <TCast>(this IIdentity identity) where TCast : IEntity
{
if (identity == null)
{
throw new ArgumentNullException(nameof(identity));
}
if (!identity.EntityType.IsAssignableFrom(typeof(TCast)))
{
string message = String.Format(Resources.ExceptionMessages.CastTypeMustImplementEntityTypeFormat,
identity.EntityType.Name,
typeof(TCast).Name);
throw new ArgumentException(message, nameof(identity));
}
return(Identity.Create <TCast>(identity.Value));
}
/// <summary>
/// Gets the identity for a given entity instance.
/// </summary>
/// <returns>The identity.</returns>
/// <param name="entity">Entity.</param>
/// <typeparam name="TEntity">The entity type.</typeparam>
public static IIdentity <TEntity> GetIdentity <TEntity>(this TEntity entity) where TEntity : IEntity
{
return((IIdentity <TEntity>)Identity.Create(entity.GetType(),
entity.GetIdentityType(),
entity.IdentityValue));
}