Configuration Sections- Create a configuration section group and retrieve configuration information from it: Part IV

Introduction

In the previous article Part III , we demonstrate how to create a custom section with custom attributes using the ConfigurationSection class and IConfigurationSectionHandler interface. And our goal was to create a customized section that represents ports and enable developer rectify the listen ports after the application deployment. Assuming that we develop an enterprise planning resource for a given firm in witch an application F used by the financial department listens to the application A used by the account department. In the current article we will achieve the same goal with different manner, I mean; we will use a section group to set sections within the same characteristics.

Section group representation

It simply represents a group of specified sections within a configuration file, I mean, it is a group of sections container and this is very useful for organizational purposes, moreover, it avoids a certain naming conflicts. A section group has some arguments witch are:

Remember that in Part II article, we treated the case of none centralized information system, Imagine now a strongly centralized information system conforming to this hierarchy:



In such situation, the general department solution will listen to more than one application. The best manner to organize the ports sections is to group them in one section group instead of adding them separately. To achieve this goal we take the following steps:

• Add the custom configuration class to the project.

public class PortSectionHandler : ConfigurationSection<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

{

//First constructor

public PortSectionHandler() { }

//Second constructor

public PortSectionHandler(string SectionName,string Key, string Serial)

{

this.SectionName = SectionName; this.Key = Key; this.Serial = Serial;

}

//First property: SectionName

private string _SectionName;

public string SectionName

{

get { return _SectionName; }

set { _SectionName = value; }

}

//Second property: The port Key

[ConfigurationProperty("key", DefaultValue = "Account", IsRequired = true)]

[StringValidator(InvalidCharacters = "|~!@#$%^&*()[]{}/;'\\",MinLength = 1)]

public string Key

{

get { return (string)this["key"]; }

set { this["key"] = value; }

}

//Third property: The port serial

[ConfigurationProperty("serial", DefaultValue = "9000",IsRequired = true)]

[StringValidator(InvalidCharacters = "|~!@#$%^&*()[]{}/;'\\", MinLength = 1)]

public string Serial

{

get { return this["serial"] as string;}

set {this["serial"] = value;}

}

}

• Add the method that handles the configuration section group

private static void AddNewSectionGroup()

{

/* This code provides access to configuration files using OpenMappedExeConfiguration method. You can use the OpenExeConfiguration method instead. For further informatons, consult the MSDN, it gives you more inforamtions about config files access methods*/

ExeConfigurationFileMap oConfigFile = new ExeConfigurationFileMap();

oConfigFile.ExeConfigFilename = Application.StartupPath + "\\" + Application.ProductName + ".exe.config";

Configuration oConfiguration = ConfigurationManager.OpenMappedExeConfiguration(oConfigFile, ConfigurationUserLevel.None);

// Create a configuration section group

ConfigurationSectionGroup oSectionGroup = new ConfigurationSectionGroup();

//This string array contains the departments names

string[] Departement = { "Acount", "Financial", "Logistic", "Stocks", "Sales", "Technical" };

/* As we are in not real case,we generate a serial port number using a random object*/