C#调用OPC UA 解决方案

1、Opc 基金会git地址：OPC Foundation · GitHub

其中：UA-.NETStandard  、UA-.NETStandard-Samples比价有参考价值

2、参数传递方式：ns=2;s=参数名（ns表示命名空间索引，一般为2）

特殊情况可以查看所有命名空间：ns=0;i=2255，也可以用（OpcUaHelper.Tool）工具查看

下载地址：C#opc学习资源代码-其它文档类资源-CSDN下载

3、根据opc基金会提供方法整理出调用代码：OPCUAC#控制类库-制造文档类资源-CSDN下载

using Opc.Ua;
using Opc.Ua.Client;
using Opc.Ua.Configuration;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace OPCUALink
{
    /// 

    /// OPC UA Client with examples of basic functionality.
    /// 
    public class UAClient
    {
        #region Constructors
        public UAClient(bool isdebug = false)
        {
            if (isdebug)
            {
                return;
            }
            ApplicationInstance application = new ApplicationInstance();
            application.ApplicationName = SessionName;
            application.ApplicationType = ApplicationType.Client;
            //加载配置文件
            application.LoadApplicationConfiguration(ConfigPath, silent: false).Wait();
            // check the application certificate.
            //application.CheckApplicationInstanceCertificate(silent: false, minimumKeySize: 0).Wait();
            m_validateResponse = ClientBase.ValidateResponse;
            m_configuration = application.ApplicationConfiguration;
            m_configuration.CertificateValidator.CertificateValidation += CertificateValidation;
            ReceiveMsg += Msg;
        }
        #endregion

        #region Public Properties
        /// 

        /// session.
        /// 
        public Session Session => m_session;
        public static string conStr = "ns=3;s=";
        /// 

        /// session名称
        /// 
        public string SessionName { get; set; } = "DefaultSession";
        /// 

        /// opcua服务地址
        /// 
        public string ServerUrl { get; set; } = "opc.tcp://192.168.0.1/";
        /// 

        /// 配置文件
        /// 
        public string ConfigPath { get; set; } = "ConsoleReferenceClient.Config.xml";
        /// 

        /// 日志委托
        /// 
        public Action LogAction { get; set; } = t => { Console.Write(t); };
        /// 

        /// 订阅委托
        /// 
        /// 
        /// 
        public delegate void ShowMonitoredItemNotification(string DisplayName, string Value);
        public ShowMonitoredItemNotification ReceiveMsg;
        #endregion

        #region Public Methods
        /// 

        /// 连接服务器
        /// 
        public async Task ConnectAsync()
        {

            try
            {
                //if (m_session != null && m_session.Connected && m_session.SessionId.ToString() == null)
                //{
                //    LogAction?.Invoke("Session already connected!");
                //}
                //else
                //{
                //    LogAction?.Invoke("Connecting...");
                //    EndpointDescription endpointDescription = CoreClientUtils.SelectEndpoint(ServerUrl, false);
                //    EndpointConfiguration endpointConfiguration = EndpointConfiguration.Create(m_configuration);
                //    Session session = await Session.Create(endpoint: new ConfiguredEndpoint(null, endpointDescription, endpointConfiguration), configuration: m_configuration, updateBeforeConnect: false, checkDomain: false, sessionName: m_configuration.ApplicationName, sessionTimeout: 1800000u, identity: new UserIdentity(), preferredLocales: null);
                //    if (session?.Connected ?? false)
                //    {
                //        m_session = session;
                //    }

                //    LogAction?.Invoke("New Session Created with SessionName = " + m_session.SessionName);
                //    WriteLogWorkDate_n("OpcUa", "连接成功：" + ServerUrl);
                //}

                if (m_session != null && m_session.Connected == true && m_session.SessionId.ToString() == null)
                {
                    LogAction?.Invoke("Session already connected!");
                }
                else
                {
                    //Conect();
                    LogAction?.Invoke("Connecting...");

                    // Get the endpoint by connecting to server's discovery endpoint.
                    // Try to find the first endopint without security.
                    EndpointDescription endpointDescription = CoreClientUtils.SelectEndpoint(ServerUrl, false);

                    EndpointConfiguration endpointConfiguration = EndpointConfiguration.Create(m_configuration);
                    ConfiguredEndpoint endpoint = new ConfiguredEndpoint(null, endpointDescription, endpointConfiguration);

                    // Create the session
                    Session session = await Session.Create(
                        m_configuration,
                        endpoint,
                        false,
                        false,
                        m_configuration.ApplicationName,
                        30 * 60 * 1000,//30 * 60 * 10,//
                        new UserIdentity(),
                        null
                    );

                    // Assign the created session
                    if (session != null && session.Connected)
                    {
                        m_session = session;
                    }

                    // Session created successfully.
                    LogAction?.Invoke($"New Session Created with SessionName = {m_session.SessionName}");
                    WriteLogWorkDate_n("OpcUa", "连接成功：" + ServerUrl);

                }
                return true;
            }
            catch (Exception ex)
            {
                // Log Error
                LogAction?.Invoke($"Create Session Error : {ex.Message}");
                WriteLogWorkDate_n("OpcUa", "连接失败：" + ServerUrl + ":" + ex.Message);
                ConnectAsync().Wait();
                return false;
            }
        }

        private async void Conect()
        {
            LogAction?.Invoke("Connecting...");

            // Get the endpoint by connecting to server's discovery endpoint.
            // Try to find the first endopint without security.
            EndpointDescription endpointDescription = CoreClientUtils.SelectEndpoint(ServerUrl, false);

            EndpointConfiguration endpointConfiguration = EndpointConfiguration.Create(m_configuration);
            ConfiguredEndpoint endpoint = new ConfiguredEndpoint(null, endpointDescription, endpointConfiguration);

            // Create the session
            Session session = await Session.Create(
                m_configuration,
                endpoint,
                false,
                false,
                m_configuration.ApplicationName,
                30 * 60 * 10,//30 * 60 * 1000,
                new UserIdentity(),
                null
            );

            // Assign the created session
            if (session != null && session.Connected)
            {
                m_session = session;
            }

            // Session created successfully.
            LogAction?.Invoke($"New Session Created with SessionName = {m_session.SessionName}");

        }

        /// 

        /// 断开链接
        /// 
        public void Disconnect()
        {
            try
            {
                WriteLogWorkDate_n("OpcUa", "断开连接：" + ServerUrl);

                if (m_session != null)
                {
                    LogAction?.Invoke("Disconnecting...");

                    m_session.Close();
                    m_session.Dispose();
                    m_session = null;

                    // Log Session Disconnected event
                    LogAction?.Invoke("Session Disconnected.");
                }
                else
                {
                    LogAction?.Invoke("Session not created!");
                }
            }
            catch (Exception ex)
            {
                // Log Error
                LogAction?.Invoke($"Disconnect Error : {ex.Message}");
            }
        }
        string oldword = "";
        /// 

        /// 读单个节点
        /// 
        /// 
        /// ns=4;s=A_AGV到周转桶
        /// ns=0;i=2255 查看所有命名空间
        public T ReadNode(string location)
        {
            #region 
            //DataValue dataValue = null;
            //if (m_session == null || !m_session.Connected)
            //{
            //     ConnectAsync();
            //}

            //try
            //{
            //    dataValue = m_session.ReadValue(conStr + location);
            //}
            //catch
            //{
            //    ConnectAsync();
            //    dataValue = m_session.ReadValue(conStr + location);
            //}

            //return (T)dataValue.Value; 
            #endregion
            if (m_session == null || m_session.Connected == false)
            {
                ConnectAsync().Wait();
            }
            DataValue value = null;
            try
            {
                value = m_session.ReadValue(conStr + location);
            }
            catch (Exception)
            {
                ConnectAsync().Wait();
                value = m_session.ReadValue(conStr + location);
            }
            string newword = "读单个节点：" + location + ":" + value.Value;
            if (newword != oldword)
            {
                WriteLogWorkDate_n("OpcUa", newword);
                oldword = newword;
            }

            return (T)value.Value;
        }
        /// 

        /// 读多个节点
        /// 
        /// 
        /// 
        /// 
        public List ReadNodes(List locations)
        {
            for (int i = 0; i < locations.Count; i++)
            {
                locations[i] = conStr + locations[i];
            }
            if (m_session == null || m_session.Connected == false)
            {
                ConnectAsync().Wait();
            }
            var typeList = new List();
            foreach (var location in locations)
            {
                typeList.Add(typeof(T));
            }
            var nodeIds = locations.Select(t => new NodeId(t)).ToList();
            List