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Questions tagged [mef2]

Microsoft Extensibility Framework (MEF) simplifies the design of extensible and modular applications.

Microsoft Extensibility Framework (MEF) simplifies the design of extensible and modular applications. Version 2 is available from .Net 4.5 and includes Dependency Injection.

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What is included in MEF 2?

I see work is still going on with new features on MEF (MEF Codeplex site) and they are shipping MEF 2 beta releases, however they do not have any decent documentation on what the new features are experimenting/exploring/building? So, what are the…
Robert MacLean
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Is MEF or MEF2 baked into the .NET Framework?

I am trying to understand MEF and I am seeing references to MEF and MEF 2. This site lists MEF2 as being much faster than MEF (4.0). I need to understand what I am talking about when most people say MEF. So which is in the .NET Framework 4.5? MEF…
Vaccano
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How to properly scope composition per request using ASP.NET MVC, WebAPI, and MEF

I recently added MEF to an MVC/WebAPI application using a variety of resources including this SO answer How to integrate MEF with ASP.NET MVC 4 and ASP.NET Web API. While this worked for a time, I started to receive intermittent errors related to…
Robb Vandaveer
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MEF2 how does the catalogs work? Looks like it's been removed

I can't find any good examples on MEF2. I would like to create a plugin directory and use a directory catalog to load up Imports. What I would like: No attributes. Use of the Configuration Builder with Conventions Plugin directory When a dll is…
Chris Kolenko
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MEF2 how to get metadata from CompositionHost export with convention based imports

This is my first SO question so please bear with me... I am trying to load components with MEF2 using the ConventionBuilder class. Everything works as excpected until I need to access metadata that is available as attributes on a imported type.…
SBeltz
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Composing Open Generic Types with Closed Types in MEF 2

I understand that starting with MEF 2, MEF supports composing open generic types into closed types. I'm trying to compose a closed type from types exported from two different assemblies added to the same composition container and I'm receiving an…
Robb Vandaveer
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How to set CreationPolicy singleton in .net-core System.Composition (Mef)

I am converting a DNX project to .net core. Because of dependency changes, I cannot use System.ComponentModel.Composition anymore, instead must use .net core's ported version System.Composition (which I believe is known as MEF 2). However I could…
user3517546
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Why does MEF2 not apply metadata attributes to all part exports?

I'm trying to port a collection of .NET Framework-based applications to .NET Core, and as part of this process I need to switch from using MEF1 to MEF2. I've been having a lot of difficulty wrapping my head around issues relating to MEF2 (though…
Tagc
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Register instance with mef2 in uwp

I downloaded the nuget package Microsoft.Composition and tried to register a service with mef2. It seems the whole framework changed. CompositionContainer, AggregateCatalog and the RegistrationBuilder are gone. The CompositionContainer seems to be…
Briefkasten
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How to implement Dependency Injection with MVC5 and MEF2 (Convention-Based) in an n-tier application?

I'm starting a new MVC project and have (almost) decided to give the Repository Pattern and Dependency Injection a go. It has taken a while to sift through the variations but I came up with the following structure for my application: Presentation…
wowbagger
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Resolving HttpRequestBase in MEF

I'm pretty new to MEF, I always used to use autofac, which automatically registers all the "Web Request"-scoped objects in the life time scope of the Request, so you can always resolve HttpRequestBase and similar objects in dependencies. Is there a…
Wiebe Tijsma
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Mef2 Configure Registrations in each module

Ok so I am using Caliburn Micro and Mef2 in a C# WPF app using .Net 4.5. I am wondering if there is any way I can configure my registrations for Mef2 inside of the separate dlls and then use them inside my main dll. Basically the dll will configure…
twreid
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Plugins in WPF MvvM with MEF 2

I have tried the following very good tutorial https://www.eidias.com/blog/2013/7/26/plugins-in-wpf-mvvm-with-mef#cm-249 to migrate to MEF2 but for some reason the assemblies are not shown in the catalog. From MEF2 I wanted to use the API…
FriesenPole
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Compose exported value with MEF 2

With MEF 1 it was possible to compose an existing object to the container with the ComposeExportedValue(...)-Method (container.ComposeExportedValue...). How can this be done with Microsoft.Composition (MEF 2)? I can't find any Method for this…
user31705
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Microsoft.Composition (MEF2) Conventions and Open Generics

I have a type public class Queue : IQueue { .... } I can export this using [Export(typeof(Queue<>))] which will enable me to import with [Import] Queue [Import] Queue However, I would like to import these types…
bornfromanegg
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