Do not require a public parameterless ctor

[guillaume-fr]

Hi,

UpdateGraph requires entity type to have a visible parameterless ctor. This is not needed by EF, a protected parameterless ctor does the job.
I think you could remove the new() constraint and use Activator.CreateInstance<T>()

[guillaume-fr]

Activator.CreateInstance() doesn't work with a type that don't expose a public default ctor. My bad !
"Unhandled Exception: System.MissingMethodException: Default constructor not found for type ..."

Please, reopen this issue.

We could use the context to create entity Context.Set<T>().Create() It may create a proxy type I don't know if this is an issue... Or use (T)Activator.CreateInstance(typeof(T), nonPublic: true)