Database model and extension method

Question

In my ASP.NET web site I created new Entity Data Model and connected it with my MsSql database. Now I can use Model.Student class but that class don't have methods. I tried to add extension methods like

public static class Functions{
     public static double calculateStudentScore(this Model.Student s){
          //implementation
     }
}

When I create new Student and try to call my method, I can't see it, why is so?

For example lets suppose s is type of Student

double score=s.calculateStudentScore();//I can't see my calculateStudentScore method

What value(s) are you trying to calculate..? I don't see any values being passed into the method.. — MethodMan, Jul 31 '12 at 22:10
Have you added `using TheNameSpaceWhereYourExtensionMethodIs;` to the top? — M. Mennan Kara, Jul 31 '12 at 22:12
@Mr.M, to the top of the file where you are using the extension method. You need to include the namespace, so your code knows to look for extension methods there. — Eric, Jul 31 '12 at 22:15
My extension methods are in the same namespace as class in which I call my methods. — MrD, Jul 31 '12 at 22:26

score 1 · Answer 1 · answered Jul 31 '12 at 23:14

1

Your EF model is a partial class. While I agree in principle that the extension should be visible, in the meantime, just add a new file, and add the method to the class.

answered Jul 31 '12 at 23:14

Darek

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It's OK now, I forgot static keyword in method declaration. Thx to all of you! – MrD Aug 01 '12 at 00:04
1

That begs an interesting question: to extent or not to extent? Which way is better? faster? more maintainbale? – Darek Aug 01 '12 at 00:39
Well I done this way because it is easier to maintain. If I change model, there is no problem with my methods :) – MrD Aug 01 '12 at 18:29

Database model and extension method

1 Answers1