CODEWITHSUNDEEP
c#.netadd-inmaf
BlackCath
BlackCath

Reputation: 826

MAF with class inside DLL passing to host

I'm developing a MAF application which, in a DLL contains a class. The problem is, when one of the methods exposed by one of the AddIns uses this class. Example:

class A
{
    Property_1
    Property_2

    Method_X()
}

And my AddIn has a method which use class A

MyAddIn.Set(class A);

So, with this, where must I place the DLL in the pipeline? Or how should I proceed with this scenario?

When the proyect start, the warnings of the AddInStore.Update() method throws messages like: unable to connect a part of a canalization...

So, there is an article this which says "There are many other capabilities MAF provides such as versioning, passing collections and WPF visuals, passing non-serializable types, etc.". But I can't find an example.

EDIT:

Thanks to Panos for this link about the restrictions on contracts. And after more research I've found this article which, through the Paint.NET proyect, shows how to use data types in the host without referencing.

After reading both sources, I know that this is what I'm looking for. But I can't understand it yet.

As a final petition, can someone please provide me code example? Just to finally get it.

Thanks.

Upvotes: 1

Views: 699

Answers (1)

Panos Rontogiannis
Panos Rontogiannis

Reputation: 4172

You should study these guidelines on what types are allowed in the contracts assembly.

Basically you should not reference the dll you mention in the pipeline (contracts, adapters and views) because this way you can leak types from the host to the add-in. This means that you will lose versioning because all pipeline segments are referencing the same assembly. What this means is that if the add-in is referencing v.1 of the assembly and the contract is referencing v.2, both versions will be loaded and an InvalidCasrtException will be thrown.

A solution to this is to create an interface based on class A and make it a contract. Then your add-in can provide the implementation. Thiw way you will not lose versioning.

Regards,

Panos

Upvotes: 2

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