Get Original Values within a DataService

Question

I am wanting to find which properties have changed in an entity before committing it.

So in the _Updating I want to get the (cureent in DB) value for  the entity and compare it to the proposed value.

I note that we are dealing with an Microsoft.LightSwitch.Framework.EntitySet

As you are aware System.Data.Linq.EntitySet has this functionality.

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JES

Answer 1

Hi Jack,

You can access the original value of an entity's property using the details API. For example

        partial void Customers_Updating(Customer entity)
        {
            var newValue = entity.Details.Properties.Name.Value;
            var originalValue = entity.Details.Properties.Name.OriginalValue;
        }

Section "Working with the save pipeline" in this article will have more details about this.

Best regards,
Huy Nguyen

Answer 2

Huy

u dee man