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those web.config files can extend, restrict, and override any type of settings defined at an upper level, including the machine level, unless the setting is restricted to a certain level (such as process model). If no configuration file exists in an application folder, the settings valid at the upper level are applied.
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In previous versions of ASP.NET, you can access configuration information by using the ConfigurationSettings class. But you can only read the current settings, and only using a weakly typed approach. More important, although in theory you can use the class to read any settings, you can actually use it only for application-specific settings and custom sections. For example, consider the code that would be necessary in ASP.NET 1.1 to read the value of the EnableVersionHeader attribute in the <httpRuntime> section (which determines whether an ASP.NET-specific header containing version information should be added to all responses):
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object o = ConfigurationSettings.GetConfig( system.web/httpRuntime );
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The code returns an object of type HttpRuntimeConfig, which is defined in the System.Web.Configuration namespace. Unfortunately, though, that class cannot be accessed programmatically because of its protection level. What a shame, because that internal class exposes a property for each attribute and would make programmatic configuration of the application like child s play. Guess what you find in ASP.NET 2.0 A number of public configuration classes, one per predefined section, that expose through properties and methods the contents of the .config files. ASP.NET 2.0 fills another key gap by supplying tools to programmatically update the .config files (which is allowed when writing privileges have been granted).
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.NET 2.0 ships with a comprehensive management API for reading, editing, and creating web.config file settings. The root class for programmatic access to the configuration infrastructure is Configuration. Using the static methods of this class, you can access the machine.config file and any web.config file defined in the context of the application. Table 12-1 lists these static methods.
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C12620245.fm Page 389 Wednesday, June 9, 2004 4:53 PM
12
ASP.NET Configuration and Instrumentation
Table 12-1 Static Methods of the Configuration Class
Property GetExeConfiguration
Description Returns a Configuration object that represents the configuration settings for the current executable. This method is used by Windows Forms applications only. Returns a Configuration object that represents the contents of the machine.config file for the specified location and server. Returns a Configuration object that represents the contents of the web.config file for the specified location, server, and path.
GetMachineConfiguration
GetWebConfiguration
Table 12-2 lists the nonstatic properties of the Configuration class.
Table 12-2 Properties of the Configuration Class
Property AppSettings FilePath HasFile Locations Path SectionGroups Sections
Description Returns the collection of user-defined application settings, in the form of name/value pairs. Gets the physical path to the configuration file represented by this Configuration object. Indicates whether or not there s a web.config file which applies to this Configuration object. Retrieves the collection of the locations (if any) defined in the machine.config file. Returns the virtual path to the application represented by this Configuration object. Retrieves the collection of the section groups defined in the configuration files. Retrieves the collection of the sections defined in the configuration files. By using the name of the section as the selector, you can obtain a reference to a class that provides a strongly typed representation of the information.
C12620245.fm Page 390 Wednesday, June 9, 2004 4:53 PM
Part IV
Advanced Topics
Each section is mapped to a public class that inherits from ConfigurationSection. These classes expose the attributes of the corresponding section as typed properties, making it easy for you to read or edit values. The following listing shows the signature of one of these section classes, HttpRuntimeSection:
namespace System.Web.Configuration { public sealed class HttpRuntimeSection: ConfigurationSection { // Constructors public HttpRuntimeSection(); public HttpRuntimeSection(bool allowDefinition, bool allowOverride); // Properties public int AppRequestQueueLimit public bool Enable public bool EnableKernelOutputCache public bool EnableVersionHeader public TimeSpan IdleTimeOut public TimeSpan ExecutionTimeout public int MaxRequestLength public int MinFreeThreads public int MinLocalRequestFreeThreads public bool UseFullyQualifiedRedirectUrl public int RequestLengthDiskThreshold // Methods public override XmlNode GetRawXml(); public override void UpdateRawXml(XmlNode } }
{ { { { { { { { { { {
get; get; get; get; get; get; get; get; get; get; get;
set; set; set; set; set; set; set; set; set; set; set;
} } } } } } } } } } }
xmlNode);
The two overridable methods are defined in the base class. GetRawXml returns an XMLDOM representing the contents of the section. UpdateRawXml takes a modified XMLDOM and serializes it to disk in the associated configuration file.
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