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POImplementing custom configuration section handler
 

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    <p>gleanings from a variety of sources (including stackOverlflow), however when I come to use it, I get the following error message</p> <p>"The Configuration property 'deviceconfig' may not be derived from ConfigurationSection."</p> <p>I have been struggling with this for the better part of a day now, and am no nearer a solution, so any help in the matter would be greatly appreciated. I am a newbie in implementing custom config sections so please treat me gently :-)</p> <p>The app.config file looks like this:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt; &lt;configuration&gt; &lt;configSections&gt; &lt;section name="deviceconfig" type="CNIMonitor.Core.CustomConfig.DeviceConfig,Core"/&gt; &lt;/configSections&gt; &lt;system.diagnostics&gt; &lt;sources&gt; &lt;!-- This section defines the logging configuration for My.Application.Log --&gt; &lt;source name="DefaultSource" switchName="DefaultSwitch"&gt; &lt;listeners&gt; &lt;add name="FileLog"/&gt; &lt;!-- Uncomment the below section to write to the Application Event Log --&gt; &lt;!--&lt;add name="EventLog"/&gt;--&gt; &lt;/listeners&gt; &lt;/source&gt; &lt;/sources&gt; &lt;switches&gt; &lt;add name="DefaultSwitch" value="Information" /&gt; &lt;/switches&gt; &lt;sharedListeners&gt; &lt;add name="FileLog" type="Microsoft.VisualBasic.Logging.FileLogTraceListener, Microsoft.VisualBasic, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" initializeData="FileLogWriter"/&gt; &lt;!-- Uncomment the below section and replace APPLICATION_NAME with the name of your application to write to the Application Event Log --&gt; &lt;!--&lt;add name="EventLog" type="System.Diagnostics.EventLogTraceListener" initializeData="APPLICATION_NAME"/&gt; --&gt; &lt;/sharedListeners&gt; &lt;/system.diagnostics&gt; &lt;deviceconfig&gt; &lt;devices&gt; &lt;device deviceid = "1" name = "localhost" ipaddress="127.0.0.1" port="10000" status="not listening" message="no message" /&gt; &lt;device deviceid ="2" name ="2nd localhost" ipaddress="127.0.0.1" port="20000" status="not listening" message="no message" /&gt; &lt;/devices&gt; &lt;/deviceconfig&gt; </code></pre> <p></p> <p>The Custom Section Handler code as follows:</p> <pre><code>Imports System.Configuration </code></pre> <p>Namespace CNIMonitor.Core.CustomConfig</p> <pre><code>Public Class DeviceConfig Inherits ConfigurationSection &lt;ConfigurationProperty("deviceconfig")&gt; _ Public ReadOnly Property DeviceConfig() As DeviceConfig Get Return CType(MyBase.Item("deviceconfig"), DeviceConfig) End Get End Property End Class &lt;ConfigurationCollectionAttribute(GetType(Device))&gt; _ Public Class Devices Inherits ConfigurationElementCollection Protected Overrides Function CreateNewElement() As ConfigurationElement Return New Device End Function Protected Overrides Function GetElementKey _ (ByVal element As ConfigurationElement) As Object Return CType(element, Device).DeviceID End Function Public Sub Add(ByVal element As Device) Me.BaseAdd(element) End Sub End Class Public Class Device Inherits ConfigurationElement &lt;ConfigurationProperty("deviceid", DefaultValue:="", IsKey:=True, IsRequired:=True)&gt; _ Public Property DeviceID() As String Get Return CType(MyBase.Item("deviceid"), String) End Get Set(ByVal value As String) MyBase.Item("deviceid") = value End Set End Property &lt;ConfigurationProperty("hostname", DefaultValue:="", IsKey:=True, IsRequired:=False)&gt; _ Public Property HostName() As String Get Return CType(MyBase.Item("RegisteredDate"), String) End Get Set(ByVal value As String) MyBase.Item("RegisteredDate") = value End Set End Property &lt;ConfigurationProperty("ipaddress", DefaultValue:="", IsKey:=True, IsRequired:=False)&gt; _ Public Property IpAddress() As String Get Return CType(MyBase.Item("ipaddress"), String) End Get Set(ByVal value As String) MyBase.Item("ipaddress") = value End Set End Property &lt;ConfigurationProperty("port", DefaultValue:="", IsKey:=True, IsRequired:=False)&gt; _ Public Property Port() As String Get Return CType(MyBase.Item("port"), String) End Get Set(ByVal value As String) MyBase.Item("port") = value End Set End Property &lt;ConfigurationProperty("status", DefaultValue:="", IsKey:=False, IsRequired:=False)&gt; _ Public Property Status() As String Get Return CType(MyBase.Item("status"), String) End Get Set(ByVal value As String) MyBase.Item("status") = value End Set End Property &lt;ConfigurationProperty("message", DefaultValue:="", IsKey:=False, IsRequired:=False)&gt; _ Public Property Message() As String Get Return CType(MyBase.Item("message"), String) End Get Set(ByVal value As String) MyBase.Item("message") = value End Set End Property End Class End Namespace </code></pre>
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