compare model value in controller with database value

Question

I'm trying to update my model in the POST of my controller:

I'm getting the original values from the database here:

var origAttributes = (from tAttr in db.TeacherAttrs where tAttr.ID == ta.ID select tAttr);

I have a property in the my ViewModel that is a type of db.TeacherAttr

property name: ta.DMTeacherAttr

I'm wondering is there a way to compare the values between what my model (ta.DMTeacherAttr) has and what is in the database already?

I am using Entity Framework 5 as well.

jarnail · Accepted Answer · 2014-02-19 19:26:43Z

1

Have you tried this:

var origTeacherAttr = db.TeacherAttrs.Find(ta.ID);

if(origTeacherAttr.DMTeacherAttr==ta.DMTeacherAttr)
{
//Do something
}

answered Feb 19, 2014 at 19:26

jarnail

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Comments

jony89 · Accepted Answer · 2014-02-19 18:24:01Z

0

If the purpose of comparing is to see what fields exactly needed to be updated then Entity Framework will do it for you, and you need to do two things :

Map your ViewModel to your Model
Set all your Model properties to virtual

Entity Framework will wrap your classes with a proxy and will track their properties .

answered Feb 19, 2014 at 18:24

jony89

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