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When accessing name/value sections, the GetConfig method returns an instance of the System.Collections.Specialized.NameValueCollection class. The following code fragment demonstrates the use of a name/value section:
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NameValueCollection x_dict = (NameValueCollection) ConfigurationSettings.GetConfig("nameValueSection"); Console.WriteLine("First Value: " + x_dict["MyFirstKey"]); Console.WriteLine("Second Value: " + x_dict["MySecondKey"]); foreach (string x_key in x_dict.Keys) { Console.WriteLine("KEY {0}, Value {1}", x_key, x_dict[x_key]); }
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Dictionary sections are declared in the same way as name/value sections, but the return type from the GetConfig method is a System.Collections.Hashtable. The following configuration file demonstrates a dictionary section:
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<configuration> <configSections> <section name="nameValueSection" type="System.Configuration.DictionarySectionHandler" /> </configSections> <nameValueSection> <add key="MyFirstKey" <add key="MySecondKey" <add key="MyThirdKey" </nameValueSection> </configuration> value="MyFirstValue"/> value="MySecondValue"/> value="MyThirdValue"/>
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Ignore sections are included in the configuration file system to allow sections of a file to be skipped by the parser. This is useful if a configuration file contains information that will be processed by another system. The following section demonstrates an ignore section:
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<configuration> <configSections> <section name="nameValueSection" type="System.Configuration.IgnoreSectionHandler"/> </configSections>
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Appendix C. Configuring Applications <nameValueSection> <add key="MyFirstKey" <add key="MySecondKey" <add key="MyThirdKey" </nameValueSection> </configuration>
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value="MyFirstValue"/> value="MySecondValue"/> value="MyThirdValue"/>
Declaring the type to be System.Configuration.IgnoreSectionHandler (shown in boldface) causes calls to the ConfigurationSettings.GetContent method to always return null, irrespective of the section contents.
Summary
The .NET support for configuration files provides a flexible mechanism for configuring applications without relying on hard-coded settings. During the development process, configuration files allow for settings to be changed and tested without requiring recompilation. When an application is deployed, the files can be used to provide tailored support to different groups of users without the need to build multiple versions of the same application.
Appendix D. Garbage Collection
Appendix D. Garbage Collection
As is the case with Java, a Microsoft .NET programmer will usually not take an interest in the operational details of garbage collection and can safely assume that unreferenced objects will be collected as required. This appendix, however, covers some of the features that are available when the default behavior of the garbage collector (GC) doesn't meet the demands of an application; we expect the reader to be familiar with the principles of garbage collection.
Controlling the Garbage Collector
The System.GC class provides methods to directly control the execution of the garbage collector. The garbage collector is designed to determine the best time to perform a collection; however, in some situations forcing a collection can improve performance, typically when the memory requirement of an application significantly decreases at a defined point in the code.
Forcing a Collection
The static System.GC.Collect method is called to request a collection. The garbage collector will suspend active threads and compact the heap.
Important
The Java collector doesn't guarantee that explicit collection requests will be honored. The common language runtime (CLR) does guarantee that requests will be performed but doesn't promise to release all of the memory held by unreferenced objects.
Generations
The CLR includes a performance enhancement known as generations. A generational collector also known as an ephemeral collector works on the following assumptions:
It's faster to compact part of the heap than the whole heap. The older an object is, the longer its lifetime will be. New objects tend to be short lived, and groups of newly allocated objects tend to be accessed at the same time and have strong relationships.
Although these assumptions aren't universally true, empirical testing has shown that they are valid for the majority of common business applications. When an application starts, no objects are on the heap. As objects are allocated, they are considered to be in generation 0 (zero), which is the set of heap references that have yet to be examined by the garbage collector. When the collector runs, any objects that aren't collected are promoted to generation 1 (one). New object allocations will be assigned to generation 0, and when the collector runs again, surviving generation 0 objects are promoted to generation 1 and generation 1 objects are promoted to generation 2. The CLR GC supports three generations (0, 1, and 2).
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