SharpNodeSettings项目，可配置的数据采集，统一的工业数据网关，OPC UA服务器开发，PLC数据发布到自身内存，redis，opc ua，以及数据可视化开发

本项目隶属于 HslCommunication 项目的SDK套件，如果不清楚HslCommunication组件的话，可以先了解那个项目，源代码地址：https://github.com/dathlin/HslCommunication

联系作者及加群方式（激活码在群里发放）：http://www.hslcommunication.cn/Cooperation

本项目源代码地址：https://github.com/dathlin/SharpNodeSettings

本项目的主要实现的功能主要有2个：

1. 实现单个设备信息的可配置，可存储，采用一个相对标准的Xml存储机制实现，适用的场景是：如果你有20个西门子PLC（种类需要一致），但是PLC的ip地址不一致，或是具体的型号不一致，需要进行可视化的存储
2. 实现一个数据网关中心，内置了一个自身协议的网络，当然您也可以实现其他的，比如示例项目里的Redis数据网关，OPC UA数据网关。

本项目的所有的核心构建，都是围绕一定格式的Xml文件展开的，以 NodeClass 作为节点的基类，赋予每个节点 Name 值，Description 值，节点下可以跟随子节点，或是跟随设备节点，设备下可以跟随请求节点，多说无益，直接上代码

<?xml version="1.0" encoding="utf-8"?>
<Settings>
  <NodeClass Name="Devices" Description="所有的设备的集合对象">
    <NodeClass Name="分厂一" Description="">
      <NodeClass Name="车间一" Description="" />
      <NodeClass Name="车间二" Description="">
        <DeviceNode Name="ModbusTcp客户端" Description="这是描述" DeviceType="10" ConnectTimeOut="1000" CreateTime="2018/8/9 19:58:49" InstallationDate="2018/8/9 19:58:49" IpAddress="127.0.0.1" Port="502" Station="1" IsAddressStartWithZero="true" IsWordReverse="false" IsStringReverse="false">
          <DeviceRequest Name="数据请求" Description="一次完整的数据请求" Address="0" Length="30" CaptureInterval="1000" PraseRegularCode="ABCD" />
        </DeviceNode>
      </NodeClass>
    </NodeClass>
    <NodeClass Name="分厂二" Description="位于西南方">
      <NodeClass Name="车间三" Description="">
        <DeviceNode Name="测试设备二" Description="这是测试设备二的描述" DeviceType="10" ConnectTimeOut="1000" CreateTime="2018/8/10 23:01:28" InstallationDate="2018/8/10 23:01:28" IpAddress="127.0.0.1" Port="502" Station="1" IsAddressStartWithZero="true" IsWordReverse="false" IsStringReverse="false">
          <DeviceRequest Name="数据请求" Description="一次完整的数据请求" Address="100" Length="10" CaptureInterval="500" PraseRegularCode="B" />
        </DeviceNode>
      </NodeClass>
    </NodeClass>
  </NodeClass>
  <NodeClass Name="Server" Description="所有挂载的服务器">
    <ServerNode Name="异形服务器" Description="这是一个异形服务器" CreateTime="2018/8/8 13:29:30" Port="1234" ServerType="2" Password="" />
  </NodeClass>
  <NodeClass Name="Regular" Description="所有的解析规则的信息">
    <RegularNode Name="ABCD" Description="">
      <RegularItemNode Name="温度" Description="" Index="0" TypeCode="3" TypeLength="1" />
      <RegularItemNode Name="风俗" Description="" Index="2" TypeCode="9" TypeLength="1" />
      <RegularItemNode Name="转速" Description="" Index="14" TypeCode="9" TypeLength="1" />
      <RegularItemNode Name="机器人关节" Description="" Index="18" TypeCode="9" TypeLength="6" />
      <RegularItemNode Name="cvsdf" Description="" Index="42" TypeCode="9" TypeLength="1" />
      <RegularItemNode Name="条码" Description="条码信息" Index="6" TypeCode="11" TypeLength="8" />
      <RegularItemNode Name="开关量" Description="设备的开关量信息" Index="368" TypeCode="1" TypeLength="8" />
    </RegularNode>
    <RegularNode Name="B" Description="">
      <RegularItemNode Name="温度" Description="" Index="0" TypeCode="3" TypeLength="1" />
      <RegularItemNode Name="压力" Description="" Index="2" TypeCode="3" TypeLength="1" />
    </RegularNode>
  </NodeClass>
</Settings>

以上就是一个示例的XML文件，手动创建这样的一个数据表将会是难以想象的，所以本组件提供了可视化的数据创建中心，

Form nodeSettings = new SharpNodeSettings.View.FormNodeSetting( "settings.xml" )
nodeSettings.ShowDialog();

这样就可以显示一个窗体，显示节点配置信息了。

不仅可以配置左侧的节点，设备信息，还支持配置解析规则和可视化的显示，辅助你找到正确的字节索引。点击保存，即可生成上述示例的一个xml配置表。

我们有了这个配置文件后，如何才能解析出来，并且生成相应的设备呢？

我们可以调用 SharpNodeServer 来创建服务器应用，可以生成相应的节点信息，并且根据配置信息来请求设备，更新对应的数据。创建服务器的代码如下：

SharpNodeServer sharpNodeServer = new SharpNodeServer( );
sharpNodeServer.LoadByXmlFile( "settings.xml" );
sharpNodeServer.ServerStart( 12345 );

　　

这样就启动了一个最简单的服务器，主要包含实例化，加载配置，启动服务器，注意：加载配置必须放置到服务器启动之前。

怎样查看服务器的数据呢？内置了一个默认的 SimplifyNet 服务器，想要知道更多的这个服务器的内容，可以参照下面的博客：https://www.cnblogs.com/dathlin/p/7697782.html

基于 NetSimplifyClient 实现了一个通用的数据节点查看器，需要指定服务器的Ip地址和端口号：

SharpNodeSettings.View.FormNodeView form = new SharpNodeSettings.View.FormNodeView( "127.0.0.1",12345 );
form.ShowDialog();

　　

 

如果你想实现访问单个的数据，可以使用 NetSimplifyClient 创建的Demo来访问，需要注意的是，此处请求的数据都是序列化的JSON字符串。 

在实际开发中，可能你不需要上述的配置功能，你就想实现某个PLC的设备信息是可配置的，那么也可以通过本组件实现：

SharpNodeSettings.View.FormSelectDevice selectDevice = new View.FormSelectDevice( );
if (selectDevice.ShowDialog( ) == DialogResult.OK)
{
    XElement xmlDevice = selectDevice.DeviceXml;
    // 设备的配置对象可用于存储，网络传输等等操作


    // 如果想要通过xml信息创建设备
    SharpNodeSettings.Device.DeviceCore deviceCore = SharpNodeSettings.Util.CreateFromXElement( xmlDevice );
    // 演示读取数据，此处有个问题在于如果是相同种类的PLC，应用还是很方便的，如果是不同种类的，地址模型就比较麻烦。
    HslCommunication.OperateResult<short> read = deviceCore.ReadWriteDevice.ReadInt16( "D100" );
}

　　

Quick Start

按照如下的步骤走，就可以急速体验本项目所传达的核心功能价值，就可以明白本项目是否符合您的需求。启动测试之前，你需要准备个真实的设备：

• 西门子PLC
• 三菱PLC
• 欧姆龙PLC
• ModbusTcp设备

如果您没有真实的设备，也可以从网上下载个Modbus服务器软件，这里也提供一个下载地址：ModbusTcpServer.zip

下载完成后启动服务器即可。

配置Xml信息

去本项目的目录下配置设备的信息: SharpNodeSettingsXmlFile 运行 SharpNodeSettings.Tools.exe 进行配置，已经配置了一部分，如果想要快速开始，忽略本步骤也可以。

SampleServer

本示例直接重新生成 SampleServer 项目，启动程序即可。如果想要看实际的数据信息，启动 SharpNodeSettings.NodeView项目查看 

RedisServer

本示例是在 SampleServer 的基础上添加了Redis服务器，所以需要先安装好Redis服务器，windows版本下载地址：https://github.com/MicrosoftArchive/redis/releases

当然，最好再下载安装一个redis服务器的可视化工具，此处推荐 RedisDesktopManagerhttps://github.com/uglide/RedisDesktopManager/releases

然后基于本项目，重新生成 SharpNodeSettings.RedisServer 项目，启动服务器

上述的 SharpNodeSettings.NodeView 项目依然可以查看，然后下图演示Redis

 

OpcUaServer

本示例是演示从PLC采集数据并且写入到OPC UA服务器中的示例，重新生成 SharpNodeSettings.OpcUaServer 项目，启动它，如果显示是否增加信任证书时，选择是即可。

首先创建OPC UA服务器项目的时候，需要根据xml文件创建对应的OPC UA节点，这部分还是比较麻烦的

        #region INodeManager Members
        /// <summary>
        /// Does any initialization required before the address space can be used.
        /// </summary>
        /// <remarks>
        /// The externalReferences is an out parameter that allows the node manager to link to nodes
        /// in other node managers. For example, the 'Objects' node is managed by the CoreNodeManager and
        /// should have a reference to the root folder node(s) exposed by this node manager.  
        /// </remarks>
        public override void CreateAddressSpace( IDictionary<NodeId, IList<IReference>> externalReferences )
        {
            lock (Lock)
            {
                LoadPredefinedNodes( SystemContext, externalReferences );

                IList<IReference> references = null;

                if (!externalReferences.TryGetValue( ObjectIds.ObjectsFolder, out references ))
                {
                    externalReferences[ObjectIds.ObjectsFolder] = references = new List<IReference>( );
                }


                dict_BaseDataVariableState = new Dictionary<string, BaseDataVariableState>( );
                try
                {
                    // =========================================================================================
                    // 
                    // 此处需要加载本地文件，并且创建对应的节点信息，
                    // 
                    // =========================================================================================
                    sharpNodeServer = new SharpNodeServer( );
                    sharpNodeServer.WriteCustomerData = ( Device.DeviceCore deviceCore, string name ) =>
                    {
                        string opcNode = "ns=2;s=" + string.Join( "/", deviceCore.DeviceNodes ) + "/" + name;
                        lock (Lock)
                        {
                            if (dict_BaseDataVariableState.ContainsKey( opcNode ))
                            {
                                dict_BaseDataVariableState[opcNode].Value = deviceCore.GetDynamicValueByName( name );
                                dict_BaseDataVariableState[opcNode].ClearChangeMasks( SystemContext, false );
                            }
                        }
                    };

                    XElement element = XElement.Load( "settings.xml" );
                    dicRegularItemNode = SharpNodeSettings.Util.ParesRegular( element );

                    AddNodeClass( null, element, references );


                    // 加载配置文件之前设置写入方法

                    sharpNodeServer.LoadByXmlFile( "settings.xml" );
                    // 最后再启动服务器信息
                    sharpNodeServer.ServerStart( 12345 );
                }
                catch (Exception e)
                {
                    Utils.Trace( e, "Error creating the address space." );
                }
            }
        }

        private void AddNodeClass( NodeState parent, XElement nodeClass, IList<IReference> references )
        {
            foreach (var xmlNode in nodeClass.Elements( ))
            {
                if (xmlNode.Name == "NodeClass")
                {
                    SharpNodeSettings.Node.NodeBase.NodeClass nClass = new SharpNodeSettings.Node.NodeBase.NodeClass( );
                    nClass.LoadByXmlElement( xmlNode );

                    FolderState son;
                    if (parent == null)
                    {
                        son = CreateFolder( null, nClass.Name );
                        son.Description = nClass.Description;
                        son.AddReference( ReferenceTypes.Organizes, true, ObjectIds.ObjectsFolder );
                        references.Add( new NodeStateReference( ReferenceTypes.Organizes, false, son.NodeId ) );
                        son.EventNotifier = EventNotifiers.SubscribeToEvents;
                        AddRootNotifier( son );
                        
                        AddNodeClass( son, xmlNode, references );
                        AddPredefinedNode( SystemContext, son );
                    }
                    else
                    {
                        son = CreateFolder( parent, nClass.Name, nClass.Description );
                        AddNodeClass( son, xmlNode, references );
                    }
                }
                else if (xmlNode.Name == "DeviceNode")
                {
                    AddDeviceCore( parent, xmlNode );
                }
                else if (xmlNode.Name == "Server")
                {
                    AddServer( parent, xmlNode, references );
                }
            }
        }

        private void AddDeviceCore( NodeState parent, XElement device )
        {
            if (device.Name == "DeviceNode")
            {
                // 提取名称和描述信息
                string name = device.Attribute( "Name" ).Value;
                string description = device.Attribute( "Description" ).Value;

                // 创建OPC节点
                FolderState deviceFolder = CreateFolder( parent, device.Attribute( "Name" ).Value, device.Attribute( "Description" ).Value );
                // 添加Request
                foreach (var requestXml in device.Elements( "DeviceRequest" ))
                {
                    DeviceRequest deviceRequest = new DeviceRequest( );
                    deviceRequest.LoadByXmlElement( requestXml );
                    
                    AddDeviceRequest( deviceFolder, deviceRequest );
                }
            }
        }

        private void AddServer( NodeState parent, XElement xmlNode, IList<IReference> references )
        {
            int serverType = int.Parse( xmlNode.Attribute( "ServerType" ).Value );
            if (serverType == ServerNode.ModbusServer)
            {
                NodeModbusServer serverNode = new NodeModbusServer( );
                serverNode.LoadByXmlElement( xmlNode );

                FolderState son = CreateFolder( parent, serverNode.Name, serverNode.Description );
                AddNodeClass( son, xmlNode, references );
            }
            else if (serverType == ServerNode.AlienServer)
            {
                AlienServerNode alienNode = new AlienServerNode( );
                alienNode.LoadByXmlElement( xmlNode );

                FolderState son = CreateFolder( parent, alienNode.Name, alienNode.Description );
                AddNodeClass( son, xmlNode, references );
            }
        }
        private void AddDeviceRequest( NodeState parent, DeviceRequest deviceRequest )
        {
            // 提炼真正的数据节点
            if (!dicRegularItemNode.ContainsKey( deviceRequest.PraseRegularCode )) return;
            List<RegularItemNode> regularNodes = dicRegularItemNode[deviceRequest.PraseRegularCode];

            foreach (var regularNode in regularNodes)
            {
                if (regularNode.RegularCode == RegularNodeTypeItem.Bool.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Boolean, ValueRanks.Scalar, default( bool ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Boolean, ValueRanks.OneDimension, new bool[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.Byte.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Byte, ValueRanks.Scalar, default( byte ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Byte, ValueRanks.OneDimension, new byte[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.Int16.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Int16, ValueRanks.Scalar, default( short ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Int16, ValueRanks.OneDimension, new short[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.UInt16.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.UInt16, ValueRanks.Scalar, default( ushort ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.UInt16, ValueRanks.OneDimension, new ushort[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.Int32.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Int32, ValueRanks.Scalar, default( int ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Int32, ValueRanks.OneDimension, new int[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.UInt32.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.UInt32, ValueRanks.Scalar, default( uint ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.UInt32, ValueRanks.OneDimension, new uint[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.Float.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Float, ValueRanks.Scalar, default( float ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Float, ValueRanks.OneDimension, new float[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.Int64.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Int64, ValueRanks.Scalar, default( long ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Int64, ValueRanks.OneDimension, new long[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.UInt64.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.UInt64, ValueRanks.Scalar, default( ulong ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.UInt64, ValueRanks.OneDimension, new ulong[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.Double.Code)
                {
                    if (regularNode.TypeLength == 1)
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Double, ValueRanks.Scalar, default( double ) );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                    else
                    {
                        var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.Double, ValueRanks.OneDimension, new double[regularNode.TypeLength] );
                        dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                    }
                }
                else if (regularNode.RegularCode == RegularNodeTypeItem.StringAscii.Code ||
                    regularNode.RegularCode == RegularNodeTypeItem.StringUnicode.Code ||
                    regularNode.RegularCode == RegularNodeTypeItem.StringUtf8.Code)
                {

                    var dataVariableState = CreateBaseVariable( parent, regularNode.Name, regularNode.Description, DataTypeIds.String, ValueRanks.OneDimension, string.Empty );
                    dict_BaseDataVariableState.Add( dataVariableState.NodeId.ToString( ), dataVariableState );
                }
            }

        }


        /// <summary>
        /// 创建一个新的节点，节点名称为字符串
        /// </summary>
        protected FolderState CreateFolder( NodeState parent, string name )
        {
            return CreateFolder( parent, name, string.Empty );
        }
        
        /// <summary>
        /// 创建一个新的节点，节点名称为字符串
        /// </summary>
        protected FolderState CreateFolder( NodeState parent, string name, string description )
        {
            FolderState folder = new FolderState( parent );

            folder.SymbolicName = name;
            folder.ReferenceTypeId = ReferenceTypes.Organizes;
            folder.TypeDefinitionId = ObjectTypeIds.FolderType;
            folder.Description = description;
            if (parent == null)
            {
                folder.NodeId = new NodeId( name, NamespaceIndex );
            }
            else
            {
                folder.NodeId = new NodeId( parent.NodeId.ToString( ) + "/" + name );
            }
            folder.BrowseName = new QualifiedName( name, NamespaceIndex );
            folder.DisplayName = new LocalizedText( name );
            folder.WriteMask = AttributeWriteMask.None;
            folder.UserWriteMask = AttributeWriteMask.None;
            folder.EventNotifier = EventNotifiers.None;

            if (parent != null)
            {
                parent.AddChild( folder );
            }

            return folder;
        }

        /// <summary>
        /// 创建一个值节点，类型需要在创建的时候指定
        /// </summary>
        protected BaseDataVariableState CreateBaseVariable( NodeState parent, string name, string description, NodeId dataType, int valueRank, object defaultValue )
        {
            BaseDataVariableState variable = new BaseDataVariableState( parent );

            variable.SymbolicName = name;
            variable.ReferenceTypeId = ReferenceTypes.Organizes;
            variable.TypeDefinitionId = VariableTypeIds.BaseDataVariableType;
            if (parent == null)
            {
                variable.NodeId = new NodeId( name, NamespaceIndex );
            }
            else
            {
                variable.NodeId = new NodeId( parent.NodeId.ToString( ) + "/" + name );
            }
            variable.Description = description;
            variable.BrowseName = new QualifiedName( name, NamespaceIndex );
            variable.DisplayName = new LocalizedText( name );
            variable.WriteMask = AttributeWriteMask.DisplayName | AttributeWriteMask.Description;
            variable.UserWriteMask = AttributeWriteMask.DisplayName | AttributeWriteMask.Description;
            variable.DataType = dataType;
            variable.ValueRank = valueRank;
            variable.AccessLevel = AccessLevels.CurrentReadOrWrite;
            variable.UserAccessLevel = AccessLevels.CurrentReadOrWrite;
            variable.Historizing = false;
            variable.Value = defaultValue;
            variable.StatusCode = StatusCodes.Good;
            variable.Timestamp = DateTime.Now;

            if (parent != null)
            {
                parent.AddChild( variable );
            }

            return variable;
        }

　　

然后再启动一个 OPC UA Client的示例项目