mef2 | 易学教程

Is MEF or MEF2 baked into the .NET Framework?

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问题 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 or MEF2? 回答1: Well to make it even more confusing Microsoft released three versions of MEF using two only unique names: MEF and MEF2 System.ComponentModel.Composition.* MEF in .NET 4 (typically called just MEF), no support for CompositionScopes,

Is MEF or MEF2 baked into the .NET Framework?

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MEF With Portable Class library using Microsoft Composition MEF2 throws file not found exception

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问题 I am working on Portable Class Library(PCL) and trying to achieve MEF in that. I used System.Composition from Nuget. When i build and package for vsix (Extension for Visual Studio) it doesn't package and place those dll's to extension folder (C:\Users\UserName\AppData\Local\Microsoft\VisualStudio\14.0Exp\Extensions\ExtensionName\AppName\versionofYourApp). When i manually place those library in this folder it works fine. Can some one suggest a good solution to this problem. I am writing it for

Compose exported value with MEF 2

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问题 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 purpose. 回答1: I will have a shot at this one. Granted, I am only about a week in on learning MEF 2 myself, after having some limited exposure to MEF 1. So, please take that in consideration with the following answer as it could be completely wrong.

How to properly scope composition per request using ASP.NET MVC, WebAPI, and MEF

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问题 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 making connections to the database, the most frequent one being: "System.InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were

How to properly scope composition per request using ASP.NET MVC, WebAPI, and MEF

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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 making connections to the database, the most frequent one being: "System.InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached." I realized I was leaking connections but didn't understand why.