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Testing and Debugging MEF, Tips - Part 1 this is the first post of a series that will offer some tips about testing and debugging your MEF -able component and application. in this post we will focus about exporting Mock objects. the code sample for this post can be download from here . Prerequisite if you are not familiar with Mocks you better read more about this subject before proceeding with this post (in short Mocks are fake object which is use for separate dependencies during...
MEF for Beginner (Deployment Catalog) - part 12 this is the 12th post of the MEF for Beginner series, the series TOC is available here . this post will focus on Deployment Catalog . the code sample for this post can be found here . What is MEF Deployment Catalogs? the deployment catalog is actually a redesign of the older package catalog . it enable to load parts from xap packages a-synchronically. Code sample the following code sample depend on 2 assembly that...
MEF for Beginner (Import from Xaml) - part 11 this is the 11th post of the MEF for Beginner series, the series TOC is available here . this post will focus on Importing mef parts directly from the Xaml . the code sample for this post is available here . assuming that we have the following exports : Code Snippet class DemoStrings { [ Export ( "MyTag" )] public string Text1 { get { return "Hello world" ; } } ...
MEF Preview 9 was released MEF preview 9 changes will be reflected the in the release of .NET 4.0 and Silverlight 4.0 . except from bug fixing, there was some changes to the API , most of the changes is related to System.ComponentModel.Composition.Initilization.dll , which is not yet available only for none Silverlight application :-( here is a short list of API changes: PackageCatalog were brought back, and changed it name to DeploymentCatalog . PartCreator was...
MEF for Beginner (Catalogs) - part 10 this is the 10th post of the MEF for Beginner series, the series TOC is available here . this post will focus on Catalogs . What is MEF Catalogs? MEF container is using catalogs as its search area definition. the catalog have instructions about where can MEF look for the compose-able parts ( import and export definitions ). in short catalogs are actually a discovery instruction . Out of the box catalogs MEF is shipping with the following out of...
does MEF apply the SOA paradigm? in this post I'm going to argue that the Manage Extensibility Framework ( MEF ), is actually applying to the 4 tenet of Service Orientation Architecture ( SOA ), therefore MEF is actually, in-process implementation of the SOA paradigm. Background when we speaking about SOA we used to think about technologies like web services and WCF , which is cross process technologies. but does SOA define that services should always be consumed from the clouds...
MEF for Beginner (repeatable metadata) - part 9 this is the 9th post of the MEF for Beginner series, the series TOC is available here . this post will focus on having repeatable metadata definition (cases like definition of multiple categories). if you not familiar with the MEF metadata concept you may want to read part 8 . Bad practice for repeatable metadata In order to explain repeatable metadata , we will start by decorating export with untyped metadata declaration ( which consider as...
MEF for Beginner (Metadata) - part 8 this is the 8th post of the MEF for Beginner series, the series TOC is available here . this post will focus on the basics of MEF metadata capabilities, the next post discuss the ability of multiple metadata decorations . What is Metadata? metadata is piece of compile-time information that can be attached to exported part . metadata is adding peripheral information to the part, (metadata information may define which operation system supported...
MEF for Beginner (Recomposition policy) - part 7 this is the 7th post of the MEF for Beginner series, the series TOC is available here . the current post will focus on the recomposition policy. What is the recomposition policy? by default the composition should assign the Import only once (trying to recompose on already composed import will result with exception) . using the recomposition policy we can define that our Import is allowing reassignment whenever the...
MEF for Beginner (Part Creation Policy) - part 6 this is the 6th post of the MEF for Beginner series, the series TOC is available here . this post and a few that will follow will cover some of the policies options available with MEF . we will start with the instantiation policy . How do we define policy ? we will define policy as instruction that will guide behavioral decisions that related to the compose-able parts (the imported and exported parts behaviors). What is instantiation...
MEF for beginner is a blog series for developers that want to learn How To use the MEF (Manage Extensibility Framework) technology. the following post is currently available for this series: Concept How To build your first MEF application Hello Silverlight A-sync Silverlight loading Import Part Creation policy Recomposition policy Metadata (part 1) Metadata (part 2 – repeatable) Catalogs Import from Xaml Deployment Catalog תגים של Technorati: MEF...
Secured directory catalog I was discussing the question of how to secure your MEF application on this post where I was publishing replica of the MEF bits hopping that the Secured Directory Catalog will find its way into the MEF core. but as sad as it is :(, it won't make into the core. you can read more about the MEF team consideration here . anyway Glenn Block has suggest a solution for haw to build the secured catalog without rewriting half of the MEF core, so as...
MEF for Beginner – Part 5 (Import) this is the 5th post on MEF for beginner series, you can see the previous post here , here and here . this post will focus on the Import aspect. we will soon learn about the different signature that can be apply with the Import decoration, but before starting with that, we should introduce the Lazy<T> class which is a first citizen at the MEF world, and part of the CLR 4 types. Lazy<T> definition Lazy<T> is used in order of delaying the...
Securing the MEF Directory Catalog during my MEF lecture, on of the attendant (a fellow from check-point) ask the following question: " How can we secure our catalog ?" this is a really good point, because without securing our catalog, hackers can exploit our extensibility model for injecting malicious code. so can we defend our MEF gates? the short answer is yes. and the long one is yes but… Secure techniques I will mention 3 techniques, each defend our code...
Code cartoons – MEF The super hero agency
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