This is a draft cheat sheet. It is a work in progress and is not finished yet.
Export
Export type |
[Export(typeof(IOperation))]
class A : IOperation { }
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Export type hierarchy |
[InheritedExport(typeof(IOperation))]
class A : IOperation { }
class B : A { }
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Export specific contract (category) |
[Export("MyContract", typeof(IOperation))]
class A : IOperation { }
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Import
0..1 |
[Import(AllowDefault = true)]
IOperation operation;
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1..1 |
[Import]
IOperation operation;
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0..* |
[ImportMany]
IEnumerable<Lazy<IOperation, IOperationMetadata>> operations;
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Import specific contract |
[Import("MyContract")]
IOperation operation;
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The import attributes work on class fields.
For the ImportMany attribute to work, the type of the field must be a collection type.
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Catalogs
AggregateCatalog |
Combines multiple catalogs. |
ApplicationCatalog |
Discovers attributed parts in the dynamic link library (DLL) and EXE files in an application's directory and path.
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AssemblyCatalog |
Discovers attributed parts in a managed code assembly. |
DirectoryCatalog |
Discovers attributed parts in the assemblies in a specified directory. Use the overload with two parameters to narrow down DLLs and EXEs. |
FilteredCatalog |
Represents a catalog after a filter function is applied to it. |
TypeCatalog |
Discovers attributed parts from a collection of types. |
Boilerplate code for using 0..n catalogs:
var catalog = new AggregateCatalog();
catalog.Catalogs.Add(otherCatalog);
var container = new CompositionContainer(catalog);
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