AppSettingsReader 類別

參考MSDN:AppSettingsReader 類別 
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重點在:
下列範例會建立包含 區段的組態檔，然後再使用 AppSettingsReader 讀取剛產生的設定。

ConfigurationManager.RefreshSection("appSettings")


Public Shared Sub Main(ByVal args() As String)
            ' Get the count of the Application Settings.
            Dim appStgCnt As Integer = ConfigurationManager.AppSettings.Count
            Dim asName As String = "AppStg" + appStgCnt.ToString()
            ' Get the configuration file.
            Dim config As System.Configuration.Configuration = _
            ConfigurationManager.OpenExeConfiguration( _
            ConfigurationUserLevel.None)
            ' Add an Application setting.
            config.AppSettings.Settings.Add(asName, _
            DateTime.Now.ToLongDateString() + " " + _
            DateTime.Now.ToLongTimeString())
            ' Save the configuration file.
            config.Save(ConfigurationSaveMode.Modified)
            ' Force a reload of a changed section.
            ConfigurationManager.RefreshSection("appSettings")
            Console.WriteLine()
            Console.WriteLine("Application Settings:")
            ShowAppSettings()
            Console.WriteLine()
            Console.WriteLine("Press 'Enter' to exit.")
            Console.ReadLine()
End Sub 'Main

詳細請參考MSDN
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相信很多人都被這 app.config 困擾,為何要關閉再啟動一次才生效的問題!