KeyValueConfigurationElement Class

Definition

Namespace:

System.Configuration

Assembly:

System.Configuration.ConfigurationManager.dll

Represents a configuration element that contains a key/value pair.

public ref class KeyValueConfigurationElement : System::Configuration::ConfigurationElement

public class KeyValueConfigurationElement : System.Configuration.ConfigurationElement

type KeyValueConfigurationElement = class
    inherit ConfigurationElement

Public Class KeyValueConfigurationElement
Inherits ConfigurationElement

Inheritance

Object

ConfigurationElement

KeyValueConfigurationElement

Examples

The following code example demonstrates how to use members of the KeyValueConfigurationElement class.

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Web;
using System.Web.Configuration;

namespace Samples.Aspnet.Config
{
  class KeyValueConfigCollection
  {
    static void Main(string[] args)
    {
      try
      {
        // Set the path of the config file.
        string configPath = "/aspnet";

        // Get the Web application configuration object.
        Configuration config =
          WebConfigurationManager.OpenWebConfiguration(configPath);

        // Get the section related object.
        AppSettingsSection configSection =
          (AppSettingsSection)config.GetSection
          ("appSettings");

        // Display title and info.
        Console.WriteLine("ASP.NET Configuration Info");
        Console.WriteLine();

        // Display Config details.
        Console.WriteLine("File Path: {0}",
          config.FilePath);
        Console.WriteLine("Section Path: {0}",
          configSection.SectionInformation.Name.ToString());
        Console.WriteLine();

        // Create the KeyValueConfigurationElement.
        KeyValueConfigurationElement myAdminKeyVal = 
          new KeyValueConfigurationElement(
          "myAdminTool", "admin.aspx");

        // Determine if the configuration contains
        // any KeyValueConfigurationElements.
        KeyValueConfigurationCollection configSettings = 
          config.AppSettings.Settings;
        if (configSettings.AllKeys.Length == 0)
        {
          // Add KeyValueConfigurationElement to collection.
          config.AppSettings.Settings.Add(myAdminKeyVal);

          if (!configSection.SectionInformation.IsLocked)
          {
            config.Save();
            Console.WriteLine("** Configuration updated.");
          }
          else
          {
            Console.WriteLine("** Could not update, section is locked.");
          }
        }

        // Get the KeyValueConfigurationCollection 
        // from the configuration.
        KeyValueConfigurationCollection settings = 
          config.AppSettings.Settings;

        // Display each KeyValueConfigurationElement.
        foreach (KeyValueConfigurationElement keyValueElement in settings)
        {
          Console.WriteLine("Key: {0}", keyValueElement.Key);
          Console.WriteLine("Value: {0}", keyValueElement.Value);
          Console.WriteLine();
        }
      }
      catch (Exception e)
      {
        // Unknown error.
        Console.WriteLine(e.ToString());
      }

      // Display and wait
      Console.ReadLine();
    }
  }
}

Imports System.Collections.Generic
Imports System.Text
Imports System.Configuration
Imports System.Web
Imports System.Web.Configuration

Namespace Samples.Aspnet.Config
  Class KeyValueConfigCollection
    Public Shared Sub Main()
      Try
        ' Set the path of the config file.
        Dim configPath As String = "/aspnet"

        ' Get the Web application configuration object.
        Dim config As Configuration = _
          WebConfigurationManager.OpenWebConfiguration(configPath)

        ' Get the section related object.
        Dim configSection As System.Configuration.AppSettingsSection = _
        CType(config.GetSection("appSettings"), System.Configuration.AppSettingsSection)

        '      Dim configSection As AppSettingsSection = _
        '       (AppSettingsSection)config.GetSection("appSettings")

        ' Display title and info.
        Console.WriteLine("ASP.NET Configuration Info")
        Console.WriteLine()

        ' Display Config details.
        Console.WriteLine("File Path: {0}", config.FilePath)
        Console.WriteLine("Section Path: {0}", _
          configSection.SectionInformation.Name.ToString())
        Console.WriteLine()

        ' Create the KeyValueConfigurationElement.
        Dim myAdminKeyVal As KeyValueConfigurationElement = _
          New KeyValueConfigurationElement _
          ("myAdminTool", "admin.aspx")


        ' Determine if the configuration contains
        ' any KeyValueConfigurationElements.
        Dim configSettings As KeyValueConfigurationCollection = _
        config.AppSettings.Settings()

        If configSettings.AllKeys.Length = 0 Then
          ' Add KeyValueConfigurationElement to collection.
          config.AppSettings.Settings.Add(myAdminKeyVal)

          If Not configSection.SectionInformation.IsLocked Then
            config.Save()
            Console.WriteLine("** Configuration updated.")
          Else
            Console.WriteLine("** Could not update, section is locked.")
          End If
        End If

        ' Get the KeyValueConfigurationCollection 
        ' from the configuration.
        Dim settings As KeyValueConfigurationCollection = _
        config.AppSettings.Settings()

        ' Display each KeyValueConfigurationElement.
        Dim keyValueElement As KeyValueConfigurationElement
        For Each keyValueElement In settings
          Console.WriteLine("Key: {0}", keyValueElement.Key)
          Console.WriteLine("Value: {0}", keyValueElement.Value)
          Console.WriteLine()
        Next

      Catch e As System.ArgumentException
        ' Unknown error.
        Console.WriteLine(e.ToString())
      End Try
      ' Display and wait
      Console.ReadLine()
    End Sub
  End Class
End Namespace

Remarks

The KeyValueConfigurationElement object inherits from the ConfigurationElement base class. The ConfigurationElement object represents an element within a configuration file. The KeyValueConfigurationElement object can belong in a KeyValueConfigurationCollection collection.

Constructors

KeyValueConfigurationElement(String, String)

Initializes a new instance of the KeyValueConfigurationElement class based on the supplied parameters.

Properties

CurrentConfiguration	Gets a reference to the top-level Configuration instance that represents the configuration hierarchy that the current ConfigurationElement instance belongs to. (Inherited from ConfigurationElement)
ElementInformation	Gets an ElementInformation object that contains the non-customizable information and functionality of the ConfigurationElement object. (Inherited from ConfigurationElement)
ElementProperty	Gets the ConfigurationElementProperty object that represents the ConfigurationElement object itself. (Inherited from ConfigurationElement)
EvaluationContext	Gets the ContextInformation object for the ConfigurationElement object. (Inherited from ConfigurationElement)
HasContext	Gets a value that indicates whether the CurrentConfiguration property is null. (Inherited from ConfigurationElement)
Item[ConfigurationProperty]	Gets or sets a property or attribute of this configuration element. (Inherited from ConfigurationElement)
Item[String]	Gets or sets a property, attribute, or child element of this configuration element. (Inherited from ConfigurationElement)
Key	Gets the key of the KeyValueConfigurationElement object.
LockAllAttributesExcept	Gets the collection of locked attributes. (Inherited from ConfigurationElement)
LockAllElementsExcept	Gets the collection of locked elements. (Inherited from ConfigurationElement)
LockAttributes	Gets the collection of locked attributes. (Inherited from ConfigurationElement)
LockElements	Gets the collection of locked elements. (Inherited from ConfigurationElement)
LockItem	Gets or sets a value indicating whether the element is locked. (Inherited from ConfigurationElement)
Properties	Gets the collection of properties.
Value	Gets or sets the value of the KeyValueConfigurationElement object.

Methods

DeserializeElement(XmlReader, Boolean)	Reads XML from the configuration file. (Inherited from ConfigurationElement)
Equals(Object)	Compares the current ConfigurationElement instance to the specified object. (Inherited from ConfigurationElement)
GetHashCode()	Gets a unique value representing the current ConfigurationElement instance. (Inherited from ConfigurationElement)
GetTransformedAssemblyString(String)	Returns the transformed version of the specified assembly name. (Inherited from ConfigurationElement)
GetTransformedTypeString(String)	Returns the transformed version of the specified type name. (Inherited from ConfigurationElement)
GetType()	Gets the Type of the current instance. (Inherited from Object)
Init()	Sets the KeyValueConfigurationElement object to its initial state.
InitializeDefault()	Used to initialize a default set of values for the ConfigurationElement object. (Inherited from ConfigurationElement)
IsModified()	Indicates whether this configuration element has been modified since it was last saved or loaded, when implemented in a derived class. (Inherited from ConfigurationElement)
IsReadOnly()	Gets a value indicating whether the ConfigurationElement object is read-only. (Inherited from ConfigurationElement)
ListErrors(IList)	Adds the invalid-property errors in this ConfigurationElement object, and in all subelements, to the passed list. (Inherited from ConfigurationElement)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
OnDeserializeUnrecognizedAttribute(String, String)	Gets a value indicating whether an unknown attribute is encountered during deserialization. (Inherited from ConfigurationElement)
OnDeserializeUnrecognizedElement(String, XmlReader)	Gets a value indicating whether an unknown element is encountered during deserialization. (Inherited from ConfigurationElement)
OnRequiredPropertyNotFound(String)	Throws an exception when a required property is not found. (Inherited from ConfigurationElement)
PostDeserialize()	Called after deserialization. (Inherited from ConfigurationElement)
PreSerialize(XmlWriter)	Called before serialization. (Inherited from ConfigurationElement)
Reset(ConfigurationElement)	Resets the internal state of the ConfigurationElement object, including the locks and the properties collections. (Inherited from ConfigurationElement)
ResetModified()	Resets the value of the IsModified() method to false when implemented in a derived class. (Inherited from ConfigurationElement)
SerializeElement(XmlWriter, Boolean)	Writes the contents of this configuration element to the configuration file when implemented in a derived class. (Inherited from ConfigurationElement)
SerializeToXmlElement(XmlWriter, String)	Writes the outer tags of this configuration element to the configuration file when implemented in a derived class. (Inherited from ConfigurationElement)
SetPropertyValue(ConfigurationProperty, Object, Boolean)	Sets a property to the specified value. (Inherited from ConfigurationElement)
SetReadOnly()	Sets the IsReadOnly() property for the ConfigurationElement object and all subelements. (Inherited from ConfigurationElement)
ToString()	Returns a string that represents the current object. (Inherited from Object)
Unmerge(ConfigurationElement, ConfigurationElement, ConfigurationSaveMode)	Modifies the ConfigurationElement object to remove all values that should not be saved. (Inherited from ConfigurationElement)

See also

• ConfigurationElement