mef

问题 Background: I'm interested in using MEF to provide a plug-in architecture in a WinForm application using C# with .NET 4.0, but I am not clear on a couple of things. First: I have not worked at all with building DLLs yet in C#, and I'm a little fuzzy on the concept of DLL Assemblies and how a DLL is normally loaded into memory ( meaning, all at once or in pieces as needed ) Intent: The program will be a machine hardware control framework, and will be made up of a primary WinForm GUI that is a

问题 I'm starting to use MEF, and I have a class with multiple constructors, like this: [Export(typeof(ifoo))] class foo : ifoo { void foo() { ... } [ImportingConstructor] void foo(object par1) { ... } } I am using catalog.ComposeExportedValue() when composing to supply the par1 value to second constructor: ... catalog.ComposeExportedValue(par1Value); catalog.ComposeParts(this); ... To hold the components I'm using: [ImportMany(typeof(ifoo))] public List<Lazy<ifoo, ifoometadata>> FooList { get;

问题 If I have one type MyClass, register with [Export(typeof(Myclass))] attribute, and [PartCreationPolicy(CreationPolicy.Shared)] or [PartCreationPolicy(CreationPolicy.NonShared)] and later trying to call compositionContainer.GetExportedValue<Myclass>() multiple times. Question: with the first call, I will get my registered class via MEF - llokup all registered assemblies, then trying to find one registered contract. Question is about second time and so on - will MEF do global lookup again or it

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . Can anybody give me a simple wpf application using mef and following mvvm pattern. I have looked a lot on the internet but i found

问题 I am wondering what is the best way to use NLog with Managed Extensibility Framework (MEF)? I have an application that support plugins using MEF architecture (Import and Exports etc) I want to add logging capability to my application. As a logging component I want to use NLog. What would you recommend? 1. Create a wrapper for NLog, i.e. additional plugin that configures NLog and exports functions like void Log(string level, string message) that other plugins importing 2. Every plugin should

问题 UPDATE As I've tried to get MEF working throughout my application, I'm coming across more an more places where I just don't get why it's not automatically creating my library when I expect it to. I think it all comes back to what Reed was saying about needing MEF to create everything. So right now, I have an XML reader class that needs to use my CandySettings, but even though its ICandySettings property has the [Import] attribute, it doesn't get imported. First I found out that [Import] doesn

问题 I have a scenario where I have to get an export from my CompositionContainer instance but I only have a Type to work with; I don't know the type at compile time, hence I can't retrieve the exported object in the normal generic way. Normally you would do this: _container.GetExportedObject<IMyType>(); But in my case, I have this: Type someType = ... ; _container.HowDoIGetTheExport(someType); Any ideas? 回答1: Found the answer: var export = _container.GetExports(someType, null, null)

问题 Scenario: I am using Managed Extensibility Framework to load plugins (exports) at runtime based on an interface contract defined in a separate dll. In my Visual Studio solution, I have 3 different projects: The host application, a class library (defining the interface - "IPlugin") and another class library implementing the interface (the export - "MyPlugin.dll"). The host looks for exports in its own root directory, so during testing, I build the whole solution and copy Plugin.dll from the

问题 I have a MEF-based application that can be customized with plugins. This application has several imported parts, and I want to remove some of them at runtime (to be able to delete the .dll that contains them) when a user decides to get rid of that plugin. CompositionBatch would do what I need, but it needs ComposablePart instances as input parameters for RemovePart() method, and I only have plain objects that implement ISomething interface, or ComposablePartDefinition instances in the

问题 To what extent, if any, is MEF a replacement for PRISM? 回答1: Edit: Do not read this answer. It is embarrassingly wrong. I am fail. Read Glenn Block's below. It's not obvious, but this is the same question: Managed Extensibility Framework (MEF) vs. Composite UI Application Block (CAB) Consensus in the duplicate post is that MEF and Prism provide the same basic set of functionality in different ways, except that Prism provides the Event Aggregator, which is a pub-sub means of communication