Home/ Questions/Q 622511
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-13T18:59:32+00:00

I have created a Entity Framework mapping based on the book Microsoft Entity Framework

  • 0

I have created a Entity Framework mapping based on the book “Microsoft Entity Framework in Action”. The OrderIT DB is available for download from the link. I am on VS 2010 RC and this is my first serious try of EF. But I keep getting an error

“Object reference not set to an
instance of an object. Model.edmx”

I have broken the .edmx file into constituent ssdl, csdl and msl files and ran edmgen and it

gives me the same error as shown
below. EdmGen
/mode:ValidateArtifacts
/incsdl:OrderIT.csdl
/inssdl:OrderIT.ssdl
/inmsl:OrderIT.msl

error 7001: Object reference not set
to an instance of an object.

Validation Complete — 1 errors, 0
warnings

Obviously something is wrong with the mapping but the error message gives me no details. Why I am getting this error and how to fix it ?

I have uploaded the relevant files here.

Update
I did the whole thing again and this time marked the Company class as abstract. Looked like it is working now. It maybe this is the issue but I am not certain as I am new to EF in general.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I made the Company class abstract and it build correctly. With my inexperience in EF and the error message not indicating any details I was stumped.

    • 0