c# - 从对 ServerManager 类的公共(public)访问启动 Opc Ua 服务器抛出 NullPointerException

Question

我尝试以这种方式启动 OPC UA 服务器:http://documentation.unified-automation.com/uasdkdotnet/2.1.0/html/L3ServerTutGSLess01.html

ApplicationLicenseManager.AddProcessLicenses(Assembly.GetExecutingAssembly(), "License.lic");
MyServerManager server = new MyServerManager();
ApplicationInstance.Default.Start(server, null, server); //Start the server

At ApplicationInstance.Default.Start(server, null, server)" following Error Appears: System.NullReferenceException: Object reference not set to an object instance. at UnifiedAutomation.UaServer.ServerSettings..ctor ( ApplicationInstance application ) at UnifiedAutomation.UaServer.ServerManager.OnServerStarting ( ApplicationInstance application ) at UnifiedAutomation.UaBase.ServerBase.Start ( ApplicationInstance application ) at UnifiedAutomation.UaServer.ServerManager.Start ( ApplicationInstance application ) at UnifiedAutomation.UaBase.ApplicationInstance.Start ( ServerBase server , WaitCallback callback , Object userData ) at VeitsServer.TapakoServerStarter.StartAkomiServer ( IDevice testDeviceToLink ) in TapakoServerStarter.cs : line . 39 at Implementationstests.OpcUaServerTest.ServerShouldRun ( ) in OpcUaServerTest.cs : line 44

如果它是从 Main() 内部启动的，则相同的代码可以正常工作。但是，一旦我尝试通过同一项目映射(例如测试项目)中的外部项目调用 OpcUaServerStarter，就会出现 NullReferenceException。

也许项目必须编译为 .dll 或者我必须添加一些引用？或者出于某种原因，MyServerManager 的可见性在 OPC-UA 网站上是内部。

Exception 之前的 Debug Session 看起来是这样的:

MyServerManager 类(与工作的 MyServerManager 唯一的关键区别可能是 public 封装):

 public class MyServerManager : ServerManager
{

    private NodeManager _nodeManager;
    private ObjectModel _objectModel;

    /// <summary>
    /// Method is called (from SDK) when NodeManager starts up.
    /// </summary>
    /// <param name="rootNodeManager"></param>
    protected override void OnRootNodeManagerStarted(RootNodeManager rootNodeManager)
    {
        Console.WriteLine("Creating Node Manager.");

        _nodeManager = new NodeManager(this);
        _nodeManager.Startup();

        _objectModel = new ObjectModel(_nodeManager);
    }

    /// <summary>
    /// Creates an internal model of the given device and automatically creates nodes and callbacks
    /// </summary>
    /// <param name="device">AKOMI Device that will be shown on the Server</param>
    public void LinkObjectToModel(IDevice device)
    {
        if (_objectModel == null)
        {
            throw new NullReferenceException("hv: objectModel is not initilized, try starting the server first.");
        }

        Console.WriteLine("Register Device: " + device.GetType().Name);
        _objectModel.RegisterAkomiDevice(device, 0, 4);
    }

    /// <summary>
    /// Creates an internal model of the given entity and automatically creates nodes and callbacks
    /// </summary>
    public void LinkObjectToModel(object entity, string name, int curLvl, int maxLvl)
    {
        if (_objectModel == null)
        {
            throw new NullReferenceException("hv: objectModel is not initilized, try starting the server first.");
        }

        Console.WriteLine("Register Entity: " + name);
        _objectModel.RegisterEntity(entity, name, curLvl, maxLvl);
    }

}

谢谢!

Answer 1

最后我找到了解决方案。我必须将以下代码添加到“App.config”文件中。希望能解决您的问题!

<?xml version="1.0"?> <!--The UA Server needs this App.config!-->
<configuration>
  <configSections>
    <section name="UaApplicationConfiguration" type="UnifiedAutomation.UaBase.ApplicationConfigurationSection,UnifiedAutomation.UaBase"/>
  </configSections>
  <UaApplicationConfiguration>

    <SecuredApplication xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://opcfoundation.org/UA/2011/03/SecuredApplication.xsd" xmlns:ua="http://opcfoundation.org/UA/2008/02/Types.xsd">

      <!-- Identify the Application -->
      <ApplicationName>My Server</ApplicationName>
      <ApplicationUri>urn:localhost:UnifiedAutomation:MyServer</ApplicationUri>
      <ApplicationType>Server_0</ApplicationType>

      <!-- Specify location of Certificates and Trust Lists -->
      <ApplicationCertificate>
        <StoreType>Directory</StoreType>
        <StorePath>%CommonApplicationData%\unifiedautomation\UaSdkNet\pki\own</StorePath>
        <SubjectName>CN=GettingStartedServer/O=UnifiedAutomation/DC=localhost</SubjectName>
        <ValidationOptions>0</ValidationOptions>
      </ApplicationCertificate>
      <TrustedCertificateStore>
        <StoreType>Directory</StoreType>
        <StorePath>%CommonApplicationData%\unifiedautomation\UaSdkNet\pki\trusted</StorePath>
        <ValidationOptions>0</ValidationOptions>
      </TrustedCertificateStore>
      <IssuerCertificateStore>
        <StoreType>Directory</StoreType>
        <StorePath>%CommonApplicationData%\unifiedautomation\UaSdkNet\pki\issuers</StorePath>
        <ValidationOptions>0</ValidationOptions>
      </IssuerCertificateStore>
      <RejectedCertificatesStore>
        <StoreType>Directory</StoreType>
        <StorePath>%CommonApplicationData%\unifiedautomation\UaSdkNet\pki\rejected</StorePath>
        <ValidationOptions>0</ValidationOptions>
      </RejectedCertificatesStore>

      <!-- Specify Endpoints the Server will use -->
      <BaseAddresses>
        <BaseAddress>opc.tcp://localhost:48030</BaseAddress>

        <!--
        Uncomment this line to enable the HTTPS based profiles.

        This profile works but is not officially supported in this version of the SDK.
        This is the HTTP based protocol that will be supported by embedded devices.

        Enabling this profile requires that you have a HTTPS certificate issued by a certificate authority
        in your root certificate store. You can create your own authority and add it to the root store or
        you can use authorities like VeriSign or Thawte.
        -->
        <!--
        <BaseAddress>https://localhost:48031/</BaseAddress>
         -->

        <!--
        Uncomment this line to enable the WS-Secure Conversation based profiles.

        This profile works but is not officially supported since it is not practical to support on embedded devices.
        You should not enable this protocol unless you have an application that must support XML Web Services.
        -->
        <!--
        <BaseAddress>http://localhost:48032/wssecurity/</BaseAddress>
        -->
      </BaseAddresses>

      <!-- Specify the SecurityProfiles the Server supports -->
      <SecurityProfiles>
        <SecurityProfile>
          <ProfileUri>http://opcfoundation.org/UA/SecurityPolicy#Basic256</ProfileUri>
          <Enabled>true</Enabled>
        </SecurityProfile>
        <SecurityProfile>
          <ProfileUri>http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15</ProfileUri>
          <Enabled>true</Enabled>
        </SecurityProfile>
        <SecurityProfile>
          <ProfileUri>http://opcfoundation.org/UA/SecurityPolicy#None</ProfileUri>
          <Enabled>true</Enabled>
        </SecurityProfile>
      </SecurityProfiles>

      <!-- Specify Configuration for Different Components (Can include 'YourCompany' Configuration) -->
      <Extensions>

        <!-- Specify the Trace settings for the Application -->
        <Extension>
          <TraceSettings xmlns="http://unifiedautomation.com/schemas/2011/12/Application.xsd" MasterTraceEnabled="false" DefaultTraceLevel="Info">
            <TraceFile>%CommonApplicationData%\unifiedautomation\logs\GettingStartedServer.log.txt</TraceFile>
            <MaxEntriesPerLog>100000</MaxEntriesPerLog>
            <MaxLogFileBackups>3</MaxLogFileBackups>
            <FastTrace>false</FastTrace>
            <ModuleSettings>
              <ModuleTraceSettings ModuleName="UnifiedAutomation.Stack"/>
              <ModuleTraceSettings ModuleName="UnifiedAutomation.Server"/>
            </ModuleSettings>
          </TraceSettings>
        </Extension>

        <!-- Specify Settings when EXE is run with the /install argument -->
        <Extension>
          <InstallationSettings xmlns="http://unifiedautomation.com/schemas/2011/12/Application.xsd">
            <GenerateCertificateIfNone>true</GenerateCertificateIfNone>
            <DeleteCertificateOnUninstall>true</DeleteCertificateOnUninstall>
          </InstallationSettings>
        </Extension>

        <!-- Specify Settings for the ServerManager -->
        <Extension>
          <ServerSettings xmlns="http://unifiedautomation.com/schemas/2011/12/Application.xsd">
            <ProductName>UnifiedAutomation GettingStartedServer</ProductName>
            <DiscoveryRegistration>
              <Enabled>false</Enabled>
            </DiscoveryRegistration>
          </ServerSettings>
        </Extension>

        <Extension>
          <SessionSettings xmlns="http://unifiedautomation.com/schemas/2011/12/Application.xsd">
            <MaxSessionCount>100</MaxSessionCount>
          </SessionSettings>
        </Extension>

        <!-- Specify Settings for the SubscriptionManager -->
        <Extension>
          <SubscriptionSettings xmlns="http://unifiedautomation.com/schemas/2011/12/Application.xsd">
            <MaxSubscriptionCount>500</MaxSubscriptionCount>
          </SubscriptionSettings>
        </Extension>

      </Extensions>
    </SecuredApplication>
  </UaApplicationConfiguration>

  <system.serviceModel>
    <services>
      <service name="UnifiedAutomation.UaBase.SessionEndpoint" behaviorConfiguration="SessionEndpoint.Behavior">
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
        <!--
        Must turn on mexHttpsBinding instead of mexHttpBinding if only HTTPS endpoint configured.
        <endpoint address="mex" binding="mexHttpsBinding" contract="IMetadataExchange"/>
        -->
      </service>
    </services>

    <!-- Servers deployed in production environments should turn the httpGetEnabled and includeExceptionDetailInFaults options off -->
    <behaviors>
      <serviceBehaviors>
        <behavior name="SessionEndpoint.Behavior">
          <serviceDebug includeExceptionDetailInFaults="true"/>
          <serviceMetadata httpGetEnabled="true"/>
          <!--
          Must turn on httpsGetEnabled instead of httpGetEnabled if only HTTPS endpoint configured.
          <serviceMetadata httpsGetEnabled="true" />
          -->
        </behavior>
      </serviceBehaviors>
    </behaviors>

    <!--
    <diagnostics>
        <messageLogging logEntireMessage="true" maxMessagesToLog="3000" logMessagesAtServiceLevel="true" logMalformedMessages="true" logMessagesAtTransportLevel="true"/>
    </diagnostics>
    -->

  </system.serviceModel>

  <!--
  <system.diagnostics>
      <sources>
          <source name="System.ServiceModel" switchValue="Verbose, ActivityTracing">
              <listeners>
                  <add type="System.Diagnostics.DefaultTraceListener" name="Default"/>
                  <add name="ServiceModel Listener"/>
              </listeners>
          </source>
          <source name="System.ServiceModel.MessageLogging">
              <listeners>
                  <add type="System.Diagnostics.DefaultTraceListener" name="Default"/>
                  <add name="ServiceModel Listener"/>
              </listeners>
          </source>
      </sources>
      <sharedListeners>
          <add initializeData="VendorServer.svclog" type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" name="ServiceModel Listener" traceOutputOptions="LogicalOperationStack, DateTime, Timestamp, ProcessId, ThreadId, Callstack"/>
      </sharedListeners>
  </system.diagnostics>
  -->
</configuration>