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Editorial Team
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Asked: 2026-05-11T17:09:36+00:00

I am learning plug able architecture in .Net using Managed Extensibility Framework (MEF.) I

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I am learning plug able architecture in .Net using Managed Extensibility Framework (MEF.)
I saw sample code on the net, but when I tried to implement it I got stuck at one point.

The code was using:

 var catalog = new AttributedAssemblyPartCatalog(Assembly.GetExecutingAssembly());
 var container = new CompositionContainer(catalog.CreateResolver());

This var is available on C# 3.0 where as I am coding in C# 2.0.

What is the alternative of above two statements? How can I make them work in c# 2.0 using VS 2005?

i tried this bt its saying now

Error 1 The type or namespace name ‘AttributedAssemblyPartCatalog’ could not be found (are you missing a using directive or an assembly reference?) C:\Documents and Settings\test\Desktop\MEFDemo\MEFDemo\Program.cs 31 13 MEFDemo

where as i have added referance to SystemComponentModel.Composition

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1 Answer

  1. Editorial Team

    This is the use of type inference in C# 3.0.

    When using the keyword

    var

    in c# 3.0 the compiler infers the type. See scott guthries explanation

    In c# 2.0 you have to declare the type of the variable the same as c# 1.1

    e.g. 

    Type variableName = new Type();

    Making you above code example

    AttributedAssemblyPartCatalog catalog = new AttributedAssemblyPartCatalog(Assembly.GetExecutingAssembly());

CompositionContainer container = new CompositionContainer(catalog.CreateResolver());

    HTH

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