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Using the system configuration source is probably the easiest and simplest way to use the configuration features at least from a coding standpoint. One of the big reasons for this simplicity is that the storage of the configuration data is the actual application configuration file for the application (app.config/web.config). However, you do need to be careful to make sure the configuration data is still manageable. The more configuration data that is stored, the harder it can become to manage. Although it is possible to create components for the Enterprise Library Configuration Console to help manage your configuration data, it may not always be practical to do so. ( 5 discusses the Configuration Console and how to create your own design-time classes to manage configuration data.) In Listing 4-2, a simple class called MyCustomSection was created to store two configuration settings that were shown in the configuration file in Listing 4-1. Listing 4-4 then displayed the configuration data to a console window. Listing 4-5 demonstrates how this is done using the SystemConfigurationSource class. Listing 4-5. Display Configuration Settings in Console Window Using the SystemConfigurationSource Class using System; using System.Configuration; using Microsoft.Practices.EnterpriseLibrary.Common.Configuration; public class MyApp { static public void Main(string[] args) { IConfigurationSource myConfigurationSource = new SystemConfigurationSource(); //Load my section from config MyCustomSection section = myConfigurationSource.GetSection ("myCustomSection") as MyCustomSection; //Code to display configuration data to console } }

Figure 8-17. Use the modulus operator to help calculate the amount of overlap on the x and y axes. You can see in Figure 8-17 that the cat is colliding with the platform on the x axis, from the left. Because we are measuring the overlap based on the distance between the top-left corner of both the cat and the cell, it s the axis with the largest overlap that indicates the collision axis. This is an inversion of the usual SAT system, but the principle is exactly the same.

parameters. The first parameter is the URL that is downloaded, and the second URL is the complete function that receives the results. To illustrate how the HTML content is cached, it is not helpful to show the pages after they have been downloaded. Showing images after the fact illustrates that content is available and presented but does not illustrate where the content came from whether it was from the cache or from an HTTP request. A better way to show that there is a cache with content is to set a breakpoint in the code and illustrate the contents of the cache with a debugger. Figure 4-4 shows the variable CacheController and the cache that it contains.

By using the IConfigurationSource interface, other concrete IConfigurationSource implementations such as the FileConfigurationSource or SqlConfigurationSource class can be implemented with little effort. Listing 4-6 shows how the FileConfigurationSource class would be implemented to read the configuration in Listing 4-1 as an external file. Listing 4-6. Display Configuration Settings in Console Window Using the FileConfigurationSource Class using System; using System.Configuration; using Microsoft.Practices.EnterpriseLibrary.Common.Configuration; public class MyApp { static public void Main(string[] args) { IConfigurationSource myConfigurationSource = new FileConfigurationSource(@"c:\myCustom.config"); //Load my section from config MyCustomSection section = myConfigurationSource.GetSection ("myCustomSection") as MyCustomSection; //Code to display configuration data to console } } As you can see, the system configuration source is relatively easy to use. Maybe it s not as easy as AppSettings, which allows only for name/value relationships, but that is the small price to pay for the extensibility you get with custom configuration sections. In the prior examples, all the configuration data was stored in the application s configuration file. Although this may work out beautifully for applications requiring only a few configuration settings, for enterprise applications that host multiple modules, you may need a better method of storing configuration data. One way is to use external configuration files.