是否在寻找一个强大的Opc Ua .NET客户端库，以方便你在.NET环境下开发OPC UA应用程序？今天，将为你揭示一款备受好评的Opc Ua .NET客户端库
什么是Opc Ua客户端Opc Ua（Open Platform for Control and Unification）是一种广泛应用于工业自动化领域的通信协议标准
它旨在提供统一的接口和数据模型，以实现不同设备之间的无缝连接和高效的数据传输
而这款MIT License的Opc Ua客户端，正是为了帮助用户更好地理解和利用这一协议标准而开发的
此库作用使用OPC统一体系结构和Visual Studio进行通信
有了这个库，应用程序可以浏览、读取、写入和订阅网络上OPC UA服务器发布的实时数据
支架.NETCore、通用Windows平台（UWP）、Windows演示框架（WPF）和Xamarin应用程序
功能特性易于集成：该库提供简单易用的API，方便开发者快速集成到现有项目中
高效稳定：经过严格的测试和实际应用验证，确保在各种复杂环境中稳定高效运行
支持OPC UA协议：支持所有OPC UA基础协议和扩展，满足各种应用需求
灵活的配置与定制：提供丰富的配置选项和扩展点，方便根据项目需求进行定制
强大的性能优化：针对.NET环境进行了性能优化，显著提升数据传输和处理速度
MIT License：作为一款开源软件，这款客户端采用了MIT License许可模式，这意味着用户可以免费获取、修改和使用它
这极大地降低了使用成本，让更多人能够受益于它的功能和服务
如何使用通过nuget安装 Workstation.UaClient以下是从公共OPC UA服务器读取变量ServerStatus的示例
using System;using System.Threading.Tasks;using Workstation.ServiceModel.Ua;using Workstation.ServiceModel.Ua.Channels;public class Program{ /// <summary> /// Connects to server and reads the current ServerState. /// </summary> public static async Task Main() { // describe this client application. var clientDescription = new ApplicationDescription { ApplicationName = \"Workstation.UaClient.FeatureTests\", ApplicationUri = $\"urn:{System.Net.Dns.GetHostName()}:Workstation.UaClient.FeatureTests\", ApplicationType = ApplicationType.Client }; // create a 'ClientSessionChannel', a client-side channel that opens a 'session' with the server. var channel = new ClientSessionChannel( clientDescription, , // no x509 certificates new AnonymousIdentity(), // no user identity \"opc.tcp://opcua.umati.app:4840\", // the public endpoint of the umati sample server. SecurityPolicyUris.None); // no encryption try { // try opening a session and reading a few nodes. await channel.OpenAsync(); Console.WriteLine($\"Opened session with endpoint '{channel.RemoteEndpoint.EndpointUrl}'.\"); Console.WriteLine($\"SecurityPolicy: '{channel.RemoteEndpoint.SecurityPolicyUri}'.\"); Console.WriteLine($\"SecurityMode: '{channel.RemoteEndpoint.SecurityMode}'.\"); Console.WriteLine($\"UserIdentityToken: '{channel.UserIdentity}'.\"); // build a ReadRequest. See 'OPC UA Spec Part 4' paragraph 5.10.2 var readRequest = new ReadRequest { // set the NodesToRead to an array of ReadValueIds. NodesToRead = new[] { // construct a ReadValueId from a NodeId and AttributeId. new ReadValueId { // you can parse the nodeId from a string. // e.g. NodeId.Parse(\"ns=2;s=Demo.Static.Scalar.Double\") NodeId = NodeId.Parse(VariableIds.Server_ServerStatus), // variable class nodes have a Value attribute. AttributeId = AttributeIds.Value } } }; // send the ReadRequest to the server. var readResult = await channel.ReadAsync(readRequest); // DataValue is a class containing value, timestamps and status code. // the 'Results' array returns DataValues, one for every ReadValueId. var serverStatus = readResult.Results[0].GetValueOrDefault<ServerStatusDataType>(); Console.WriteLine(\"\nServer status:\"); Console.WriteLine(\" ProductName: {0}\", serverStatus.BuildInfo.ProductName); Console.WriteLine(\" SoftwareVersion: {0}\", serverStatus.BuildInfo.SoftwareVersion); Console.WriteLine(\" ManufacturerName: {0}\", serverStatus.BuildInfo.ManufacturerName); Console.WriteLine(\" State: {0}\", serverStatus.State); Console.WriteLine(\" CurrentTime: {0}\", serverStatus.CurrentTime); Console.WriteLine($\"\nClosing session '{channel.SessionId}'.\"); await channel.CloseAsync(); } catch(Exception ex) { await channel.AbortAsync(); Console.WriteLine(ex.Message); } }}// Server status:// ProductName: open62541 OPC UA Server// SoftwareVersion: 1.4.0-rc1// ManufacturerName: open62541// State: RunningModel, View, ViewModel (MVVM)对于HMI应用程序，您可以使用XAML绑定将UI元素连接到实时数据
首先添加一个UaApplication实例，并在启动过程中对其进行初始化：public partial class App : Application{ private UaApplication application; protected override void OnStartup(StartupEventArgs e) { // Build and run an OPC UA application instance. this.application = new UaApplicationBuilder() .SetApplicationUri($\"urn:{Dns.GetHostName()}:Workstation.StatusHmi\") .SetDirectoryStore($\"{Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)}\\Workstation.StatusHmi\\pki\") .SetIdentity(this.ShowSignInDialog) .Build(); this.application.Run(); // Create and show the main view. var view = new MainView(); view.Show(); } ...}然后，任何视图模型都可以转换为OPC UA订阅
[Subscription(endpointUrl: \"opc.tcp://localhost:48010\", publishingInterval: 500, keepAliveCount: 20)]public class MainViewModel : SubscriptionBase{ /// <summary> /// Gets the value of ServerServerStatus. /// </summary> [MonitoredItem(nodeId: \"i=2256\")] public ServerStatusDataType ServerServerStatus { get { return this.serverServerStatus; } private set { this.SetProperty(ref this.serverServerStatus, value); } } private ServerStatusDataType serverServerStatus;}在运行时配置EndpointUrl（MVVM）可以使用配置文件在运行时替换EndpointUrl的所有实例
使用这种方法可以为开发和生产指定不同的端点
using Microsoft.Extensions.Configuration;var config = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile(\"appSettings.json\", true) .Build();var app = new UaApplicationBuilder() ... .AddMappedEndpoints(config) .Build();[Subscription(endpointUrl: \"MainPLC\", publishingInterval: 500, keepAliveCount: 20)]public class MainViewModel : SubscriptionBase{ /// <summary> /// Gets the value of ServerServerStatus. /// </summary> [MonitoredItem(nodeId: \"i=2256\")] public ServerStatusDataType ServerServerStatus { get { return this.serverServerStatus; } private set { this.SetProperty(ref this.serverServerStatus, value); } } private ServerStatusDataType serverServerStatus;}appSettings.json{ \"MappedEndpoints\": [ { \"RequestedUrl\": \"MainPLC\", \"Endpoint\": { \"EndpointUrl\": \"opc.tcp://192.168.1.100:48010\", \"SecurityPolicyUri\": \"http://opcfoundation.org/UA/SecurityPolicy#None\" } } ]}源码地址

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