AppSettingsReader Class
Provides a method for reading values of a particular type from the configuration.
Assembly: System (in System.dll)
The following example creates a configuration file that contains the <appSettings> section, and then uses the AppSettingsReader to read the settings just generated.
Imports System Imports System.Collections.Specialized Imports System.Configuration Class UsingAppSettingsReader Private Shared Sub DisplayAppSettings() Try Dim reader As New System.Configuration.AppSettingsReader() Dim appSettings As NameValueCollection = ConfigurationManager.AppSettings For i As Integer = 0 To appSettings.Count - 1 Console.WriteLine("Key : {0} Value: {1}", appSettings.GetKey(i), appSettings(i)) Next i Catch e As ConfigurationErrorsException Console.WriteLine("[DisplayAppSettings: {0}]", e.ToString()) End Try End Sub Private Shared Sub CreateAppSettings() Try ' Get the count of the Application Settings. Dim appSettingsCount As Integer = ConfigurationManager.AppSettings.Count Dim asName As String = "Key" & appSettingsCount.ToString() ' Get the configuration file. Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None) ' Add an Application setting. config.AppSettings.Settings.Add(asName, Date.Now.ToLongDateString() & " " & Date.Now.ToLongTimeString()) ' Save the configuration file. config.Save(ConfigurationSaveMode.Modified) ' Force a reload of a changed section. ConfigurationManager.RefreshSection("appSettings") Catch e As ConfigurationErrorsException Console.WriteLine("[CreateAppSettings: {0}]", e.ToString()) End Try End Sub Shared Sub Main(ByVal args() As String) Dim selection As String = "" Do While selection.ToLower() <> "q" ' Create appSettings section. CreateAppSettings() ' Display appSettings section. DisplayAppSettings() Console.WriteLine() Console.WriteLine("Enter 'Q' to exit or press enter to continue.") Console.Write("> ") selection = Console.ReadLine() Loop End Sub End Class
The following example demonstrates a configuration file used by the previous example.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<appSettings>
<add key="AppStg0" value="Thursday, December 01, 2005 12:53:56 PM" />
<add key="AppStg1" value="Thursday, December 01, 2005 12:54:15 PM" />
<add key="AppStg2" value="Thursday, December 01, 2005 1:37:22 PM" />
</appSettings>
</configuration>
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.