VB.NET ConfigurationManager.OpenMappedExeConfiguration方法代碼示例

' Access a configuration file using mapping.
' This function uses the OpenMappedExeConfiguration 
' method to access a new configuration file.   
' It also gets the custom ConsoleSection and 
' sets its ConsoleElement BackgroundColor and
' ForegroundColor properties to green and red
' respectively. Then it uses these properties to
' set the console colors.  
Public Shared Sub MapExeConfiguration()

    ' Get the application configuration file.
    Dim config As System.Configuration.Configuration = _
    ConfigurationManager.OpenExeConfiguration( _
        ConfigurationUserLevel.None)

    Console.WriteLine(config.FilePath)

    If config Is Nothing Then
        Console.WriteLine( _
        "The configuration file does not exist.")
        Console.WriteLine( _
        "Use OpenExeConfiguration to create file.")
    End If

    ' Create a new configuration file by saving 
    ' the application configuration to a new file.
    Dim appName As String = _
        Environment.GetCommandLineArgs()(0)

    Dim configFile As String = _
        String.Concat(appName, "2.config")
    config.SaveAs(configFile, _
                  ConfigurationSaveMode.Full)

    ' Map the new configuration file.
    Dim configFileMap As New ExeConfigurationFileMap()
    configFileMap.ExeConfigFilename = configFile

    ' Get the mapped configuration file
    config = _
    ConfigurationManager.OpenMappedExeConfiguration( _
        configFileMap, ConfigurationUserLevel.None)

    ' Make changes to the new configuration file. 
    ' This is to show that this file is the 
    ' one that is used.
    Dim sectionName As String = "consoleSection"

    Dim customSection As ConsoleSection = _
        DirectCast(config.GetSection(sectionName),  _
            ConsoleSection)

    If customSection Is Nothing Then
        customSection = New ConsoleSection()
        config.Sections.Add(sectionName, customSection)
    End If

    ' Change the section configuration values.
    customSection = _
        DirectCast(config.GetSection(sectionName),  _
            ConsoleSection)
    customSection.ConsoleElement.BackgroundColor = _
        ConsoleColor.Green
    customSection.ConsoleElement.ForegroundColor = _
        ConsoleColor.Red
    ' Save the configuration file.
    config.Save(ConfigurationSaveMode.Modified)

    ' Force a reload of the changed section. This 
    ' makes the new values available for reading.
    ConfigurationManager.RefreshSection(sectionName)

    ' Set console properties using the 
    ' configuration values contained in the 
    ' new configuration file.
    Console.BackgroundColor = _
        customSection.ConsoleElement.BackgroundColor
    Console.ForegroundColor = _
        customSection.ConsoleElement.ForegroundColor
    Console.Clear()

    Console.WriteLine()
    Console.WriteLine( _
        "Using OpenMappedExeConfiguration.")
    Console.WriteLine( _
        "Configuration file is: {0}", config.FilePath)
End Sub