The Assembly Matching Rule

The assembly matching rule allows developers, operators, and administrators to select target classes based on the assembly name or by specifying a reference to an assembly.

Behavior of the Assembly Matching Rule

The assembly matching rule does the following:

• It uses the value of the parameter passed to it to configure the matching rule for injection.
• It compares the assemblyName value to the name and version; the name, version and culture; or the fully qualified assembly name and details of the target assembly excluding the .dll file name extension. Alternatively, it tests if the specified Assembly reference is the same as the assembly it is matching against.
• It returns True if the assembly matches the specified name or types; False if it does not.

The matching rules for a policy can be defined in configuration or created and applied to policies at run time. For more information about configuring matching rules at design time, see Configuration Files for Interception in the section Design-Time Configuration.

Creating an Assembly Matching Rule at Run Time

The following constructor overloads can be used when creating an instance of the AssemblyMatchingRule class.

AssemblyMatchingRule(Assembly assembly)

AssemblyMatchingRule(string assemblyName)

AssemblyMatchingRule(assembly As Assembly)

AssemblyMatchingRule(assemblyName As String)

The following table describes the parameters shown above.

The following code extract shows how you can add an assembly matching rule to a policy using the Unity interception mechanism.

myContainer.Configure<Interception>()
           .AddPolicy("MyPolicy")
           .AddMatchingRule<AssemblyMatchingRule>
                (new InjectionConstructor("my.assembly.name"))
           .AddCallHandler<MyCallHandler>
                ("NamespaceMatchHandler", 
                new ContainerControlledLifetimeManager());

myContainer.Configure(Of Interception)() _
           .AddPolicy("MyPolicy") _
           .AddMatchingRule(Of AssemblyMatchingRule) _
                (New InjectionConstructor("my.assembly.name")) _
           .AddCallHandler(Of MyCallHandler) _
                ("NamespaceMatchHandler", New ContainerControlledLifetimeManager())

The code does not show how to create the container, add the Unity interception container extension, specify an interceptor, or resolve the intercepted target object. For more information about using matching rules with interception at run time, see Registering Policy Injection Components.

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