Entity Framework - AppDomain.CurrentDomain.GetData returns null

Question

Hello I am working on a project that involves EntityFramework 4.1 and I've run into a serious snag. I did not design the project I am merely trying to fix existing issues. The application is making a call to AppDomain.CurrentDomain.GetData(SomeValue).ToString(); There are two things I do not understand and cannot seem to find the answer to or figure out. 1.) Where is SomeValue coming from? 2.) Why is this call returning null? The only thing that comes to mind is that it is looking for the value and cannot find it but I would think there was some default that would be thrown not null. I cannot seem to figure out where that value is being set or how it is being compared from what I understand is that it is looking for a specific name but I cannot see where that name is actually being set anywhere in the application.

Vulpes · Answer

Application domains have some predefined properties which are listed in the documentation for AppDomain.GetData(): http://msdn.microsoft.com/en-us/library/system.appdomain.getdata.aspx If it doesn't appear to be a user defined property then perhaps it's one of them. The method returns null if the property does not exist. If that's the case then the ToString() method will throw a null reference exception. If that's not happening but ToString() is returning null then that probably means that the property exists but currently there is no data associated with it.