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Andrew Walsh

Entity Framework June 2011 CTP Bug

·1 min
Bugs Entity Framework
Andrew Walsh
Author
Andrew Walsh
Coder with a passion for most all things technological.

I recently installed the Entity Framework June 2011 CTP to preview the enum support but ran into a bug along the way that reported an error while processing the template.
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I encountered this error while trying to run an Entity based project using the "Database & Model First" paradigm. Uninstalling the preview removed the problem. Not sure why this error occured since the preview doesn't modify the assembly it is complaining about not finding an entry point in.

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POCO not transforming into a POCO proxy.

·1 min
.NET Entity Framework ADO.NET
A POCO (Plain Old CLR Object) must be transformed into a POCO proxy [MyNamespace.MyClass ->{System.Data.Entity.DynamicProxies.MyClass_0A943C2FC37D33304CEB497A9210C754E3F553B50315F8E6F0F7A6FAF43777F2}]{.Apple-style-span style=“font-size: x-small;”}) in order for features like lazy loading and change tracking to work. MSDN has a great article that explains how to prepare a POCO to be transformed into a proxy. If you find that an object retrieved or attached to the context does not show itself in the DynamicProxies namespace (eg. MyNamespace.MyClass instead of ...DynamicProxies.MyClass), then you probably don't have a compliant class. You may have noticed this already when hovering your mouse cursor over an instance and seeing the runtime information on it. The distilled points are that your POCO must:

EF 4.1 Code First: Many one-to-one properties for same class type on an object.

·2 mins
Entity Framework
I just started using the Entity Framework recently to employ persistence for an already established code base. Initially I was using the "Model & Database First" paradigm where a designer is used to layout the data model. Although, this ended up being tedious since my POCO instance had to exactly match the POCO proxy instance in my model designer view. After upgrading to EF 4.1, I realized the "Code First" paradigm was the way to go since I had to adapt the persistence model to my already existing code. One of the earliest problems that I ran into was having more than one property on a class that referenced the same class type. This example was taken from a great site that explored the different EF properties. []{.Apple-style-span style=“background-color: #f8f8f8; color: #2e2e2e; font-family: ‘Courier New’, Courier, mono; font-size: 12px;”}\