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If you need to change the behavior of the automatic constructor injection process, perhaps to specify the lifetime of the resolved type or to set the value or lifetime of the types resolved for the parameters, you can configure the container at design time using a configuration file or at run time using the container API.
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Design-Time Configuration Configuring constructor injection in a configuration file is useful when you need to exert control over the process. For example, consider the following class that contains a single constructor that takes two parameters.
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public class MyNewObject { public MyNewObject(Database defaultDB, string departmentName) { ... } }
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The second parameter is a string, and Unity cannot generate an instance of a string type unless you have registered it in the container using a named instance registration. Therefore, you must override the default behavior of the automatic injection process. You can do this in a configuration file, and at the same time manage three aspects of the injection process: the resolved object lifetime, the value of parameters, and the choice of constructor when the type contains more than one constructor. For example, you can use the following register directive in a configuration file to specify that the resolved instance of MyNewObject should be a singleton (with its lifetime managed by the container), that Unity should resolve the type Database of the parameter named defaultDB and inject the result, and that Unity should inject the string value Customer Service into the parameter named departmentName.
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<register type="MyNewObject"> <lifetime type="singleton" /> <constructor> <param name="defaultDB" /> <param name="departmentName" value="Customer Service" /> </constructor> </register>
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When you specify constructor injection like this, you are also specifying which constructor Unity should use. Even if the MyNewObject class contains a more complex constructor, Unity will use the one that matches the list of parameters you specify in the register element. To register your types using named registrations, you simply add the name attribute to the register element, as shown here.
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<register type="MyNewObject" name="Special Customer Object"> ... </register>
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To register mappings between an interface or base class and a type that implements the interface or inherits the base type, you add the mapTo attribute to the register element. You can, of course, define default (unnamed) and named mappings in the same way as you do type registrations. The following example shows registration of a named mapping.
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<register type="IMyType" mapTo="MyImplementingType" name="Special Customer Object"> ... </register>
Run-Time Configuration You can configure injection for the default or a specific constructor at run time by calling the RegisterType method of the Unity container. This approach also gives you a great deal of control over the process. The following code registers the MyNewObject type with a singleton (container-controlled) lifetime.
myContainer.RegisterType<MyNewObject>(new ContainerControlledLifetimeManager());
If you want to create a named registration, you add the name as the first parameter of the RegisterType method, as shown here.
myContainer.RegisterType<MyNewObject>( Special Customer Object", new ContainerControlledLifetimeManager());
If you want to create a mapping, you specify the mapped type as the second generic type parameter, as shown here.
myContainer.RegisterType<IMyType, MyImplementingType>( "Special Customer Object", new ContainerControlledLifetimeManager());
If you need to specify the value of the constructor parameters, such as a String type (which Unity cannot create unless you register a String instance with the container), or specify which constructor Unity should choose, you include an instance of the Injection Constructor type in your call to the RegisterType method. For example, the following creates a registration named Special Customer Object for the MyNewObject type as a singleton, specifies that Unity should resolve the type Database of the parameter named defaultDB and inject the result, and that Unity should inject the string value Customer Service into the parameter named departmentName.
myContainer.RegisterType<MyNewObject>( "Special Customer Object", new ContainerControlledLifetimeManager(), new InjectionConstructor(typeof(Database), "Customer Service") );
Configuration with Attributes When you specify just the type in a constructor parameter, as shown earlier, the container will return the default concrete implementation of that type as defined in the registrations within the container. To specify a named registration when using constructor injection, you can add the Dependency attribute to the parameter definition, as shown below.
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