/// <summary>
/// Returns the names of the primary key columns.
/// </summary>
/// <param name="context">The instance of the context.</param>
/// <param name="entityType">The type of the entity.</param>
/// <returns></returns>
internal static IEnumerable <string> GetPrimaryKeys(this IObjectContextAdapter context, Type entityType)
{
var entityContainer = context.GetEntityContainer();
var entitySet = entityContainer.GetEntitySetByName(entityType.Name, false);
if (entitySet == null)
{
throw new EntityGateProviderException(string.Format(CultureInfo.InvariantCulture, Resources.EntitySetNotAvailable, entityType.Name));
}
return(entitySet.ElementType.KeyMembers.Select(k => k.Name));
}
/// <summary>
/// Determines whether the context is the one that references the requested entity type.
/// </summary>
/// <typeparam name="TContext">The type of context.</typeparam>
/// <param name="context">The context to check.</param>
/// <param name="entityType">The type of entity requested.</param>
/// <returns></returns>
internal static bool IsRelativeToEntityType(this IObjectContextAdapter context, Type entityType)
{
var isValidContext = false;
if (context != null)
{
// We will check the compatibility of the context with the entity.
var entityContainer = context.GetEntityContainer();
if (entityContainer.BaseEntitySets != null)
{
// The entity is present in the context.
if (entityContainer.BaseEntitySets.Any(entitySetBase => ContextHelper.MatchEntityType(entitySetBase, entityType)))
{
isValidContext = true;
}
}
}
return(isValidContext);
}