public static void SetForeignKey <T>(this T @this, Guid?id = null) where T : IId
{
// Step 1. get a property with the SetForeignKeyAttribute
foreach (PropertyInfo propertyInfo in @this.GetType().GetProperties())
{
// Set value
if (propertyInfo.GetCustomAttribute <SetForeignKeyAttribute>() != null)
{
// Set value
propertyInfo.SetValue(@this, @this.Id);
}
// Step in 1:1
if (propertyInfo.PropertyType.GetInterfaces().Contains(typeof(IId)))
{
IId child = propertyInfo.GetValue(@this) as IId;
if (child != null)
{
child.SetForeignKey(@this.Id);
}
}
// Step into collection 1:N
if (propertyInfo.PropertyType.GetInterfaces().Contains(typeof(IEnumerable)))
{
foreach (var item in propertyInfo.GetValue(@this) as IEnumerable)
{
IId child = item as IId;
if (child != null)
{
child.SetForeignKey(@this.Id);
}
}
}
}
}