CODEWITHSUNDEEP
vb.netentity-framework
Dom Sinclair
Dom Sinclair

Reputation: 2528

Differentiating between a record that exists and one that is new in ef partial class

Thanks to the good offices of people here I came to realise that if one has a constructor in a partial class in ones entity model it will be called whenever records are retrieved or when actual new records are created.

I have been searching for a simple example of how one might differentiate between the two so that property assignments added to the constructor are only ever applied to ne records. If anyone knows of such a sample or could provide one here (preferably in VB.net) I would be most grateful.

Here is a typical example of the sort of thing I'd like to only get called when a new record was being created as opposed to whenever a record was retrieved.

Public Sub New()
    OrderNumber = te.UpdateAndReturnSalesOrderNumber.FirstOrDefault
    OrderDate = Now
    Posted = False

End Sub

Thanks

Upvotes: 0

Views: 40

Answers (1)

Tony Basallo
Tony Basallo

Reputation: 3074

It's been a while since I've played with the partial classes and thus don't remember the order of things.

But, if you have an ID you could check for the default value (i.e., 0 or empty) after EF hydrates your class.

I think I remember doing something like this.

Upvotes: 1

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