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Another pattern that is used in Enterprise Library application blocks is the Plug-in pattern. This pattern allows for extending the behavior of an existing class to suit a specific need by defining the correct instance outside the existing class. Reconsidering Listing 3-1, suppose that the appropriate IDemo instance returned is to be determined by an environment variable. Say there are ten environments that need ten different instances of IDemo. To support that, ten different case statements would be required within the switch state of the CreateInstance method. Although this wouldn t be that difficult to handle in this scenario, imagine an enterprise scenario where there could be hundreds of factories returning different instances. One way to prevent this type of maintenance headache is to use the Plug-in pattern. Now the correct component can be determined at runtime, based on a configuration file provided for the specific environment. In this case, a Factory pattern could still be used, but a demoType would not be passed in as a parameter of the CreateInstance method. Instead, the CreateInstance method would look at a configuration file to determine the appropriate IDemo instance to create. Listings 3-2 and 3-3 show an example of this. Listing 3-2. Plug-in Pattern Configuration Example <myDemoConfig> <object type="MyDemo.AlphaDemo" assembly="MyDemo"/> </myDemoConfig> vb.net qr code scanner VB . NET Image: VB . NET QR Code Barcode Reader SDK for .NET ...
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