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MEF is already in the .NET Framework 4; any IoC tools of choice is a separate set of assemblies and adds dependencies to the project. MEF is available only for .NET 4, whereas most IoC frameworks are available for most .NET platforms. This said, however, I d like to remark that MEF doesn t bring new significant capabilities to the table that you couldn t code yourself or achieve through an IoC. MEF, however, makes writing plugin-based applications really fast and simpler than ever before. If MEF serves all your IoC needs, choose MEF and code your way within the .NET Framework 4. If you re happy with the IoC you re using today, perhaps there s no need for you to change it. In this regard, MEF won t give you an ounce more than your favorite IoC. The real issue is when you want to use MEF because of plugins but still need to mix it with an IoC because MEF doesn t offer the advanced services of rich IoC for example, call interception. In this case, either you drop MEF in favor of IoC or configure MEF to accept instances created by the IoC of choice.

An MEF application is based on components known as composable parts. Each part can contain some members decorated as imports. An import is a class member with the Import attribute, and it indicates a member that will be resolved and instantiated by the MEF runtime. In a MEF application, you also find classes decorated as exports. An export is a class decorated with the Export attribute. An instance of an export class can be used to perform an import as long as the import and export match. What does determine a valid match An import/export match is based on a contract. A contract here has little to do with service or interface contracts. An MEF contract is a collection of meta information that both imports and exports contain. In most cases, it is a simple string. In other cases, it contains type information or both unique strings and type information. The list of exports is determined by catalogs. A catalog is a provider that returns the list of available exports to be matched to the imports of the object being resolved. Finally, the composition process is the process in which all imports (that is, dependencies) are resolved.

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A semicolon (;) is used as a delimiter between the StartNode and the fields to be retrieved by the query. Then the field names are listed. The fields must correspond to an element or an attribute in the XML file and are separated by a comma. Notice that the @ symbol is used as a prefix for an attribute name, whereas an element name has no prefix. Also, if a field comes from a different node, you can prefix the field with the absolute path or the relative path from the StartNode. Click the Run button on the Dataset toolbar.

Here s a brief code example to illustrate:

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public class PasswordCreator { private CompositionContainer _container; public ProgramBody() { InitializeMef(); } private void InitializeMef() { var catalog = new DirectoryCatalog("Plugins"); _container = new CompositionContainer(catalog); // Fill the imports of this object try { _container.ComposeParts(this); } catch (CompositionException compositionException); } [Import] public IPasswordFactory PasswordFactory { get; set; } public String CreatePassword() { if (PasswordFactory == null) { return "Dependency not resolved."; } return PasswordFactory.Create(12); } }

The class PasswordCreator generates a random password using the services of an object that implements the IPasswordFactory interface. No such a component, though, is instantiated by the class itself. The task, in fact, is delegated to MEF. MEF will use a directory catalog to explore all assemblies in the specified relative folder, looking for exports that match the contract of the IPasswordFactory import. So where s the contract name When you use the plain attribute, the contract name defaults to the name of the member. In this case, it is typeof(IPasswordFactory). What about exports Consider the following example:

[Export(typeof(IPasswordFactory))] public class DefaultPasswordFactory : IPasswordFactory { public String Create(Int32 passwordLength) { // Create the password }

the background to handle multipart/form-data submissions. In ASP.NET, the role of the posting acceptor is no longer necessary because it is carried out by the ASP.NET runtime itself.

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