C# ONVIF如何进行设备发现

在C#中使用ONVIF进行设备发现的步骤如下：

1. 导入ONVIF的相关命名空间：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Xml;

2. 创建一个ONVIF设备发现类，并实现设备发现的方法：

public class ONVIFDeviceDiscovery
{
    public static List<string> DiscoverDevices()
    {
        List<string> devices = new List<string>();

        // 创建UDP广播终结点
        EndpointAddress discoveryEndPointAddress = new EndpointAddress("soap.udp://239.255.255.250:3702");

        // 创建消息工厂
        MessageFactory messageFactory = new MessageFactory();

        // 创建消息版本
        AddressingVersion addressingVersion = AddressingVersion.WSAddressing10;

        // 创建消息头
        MessageHeader unicastHeader = MessageHeader.CreateHeader("Unicast", "", "");
        MessageHeader multicastHeader = MessageHeader.CreateHeader("Multicast", "", "");

        // 创建绑定元素
        BindingElement[] bindingElements = new BindingElement[2];
        bindingElements[0] = new TextMessageEncodingBindingElement();
        bindingElements[1] = new HttpTransportBindingElement();

        // 创建自定义绑定
        CustomBinding customBinding = new CustomBinding(bindingElements);

        // 创建ChannelFactory
        ChannelFactory<IDiscoveryProxy> factory = new ChannelFactory<IDiscoveryProxy>(customBinding, discoveryEndPointAddress);

        // 创建Channel
        IDiscoveryProxy proxy = factory.CreateChannel();
        factory.Open();

        // 发送消息
        Message message = messageFactory.CreateMessage(addressingVersion, "http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous", multicastHeader, new DiscoveryMessage());
        Message reply = proxy.Discover(message);

        // 解析响应
        if (reply != null)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(reply.GetReaderAtBodyContents());
            XmlNodeList nodeList = xmlDoc.GetElementsByTagName("XAddrs");

            foreach (XmlNode node in nodeList)
            {
                devices.Add(node.InnerText);
            }
        }

        // 关闭通道和工厂
        factory.Close();

        return devices;
    }
}

3. 在主程序中调用设备发现方法并输出设备信息：

class Program
{
    static void Main(string[] args)
    {
        List<string> devices = ONVIFDeviceDiscovery.DiscoverDevices();

        foreach (string device in devices)
        {
            Console.WriteLine("Discovered device: " + device);
        }

        Console.ReadLine();
    }
}

通过以上步骤，您可以在C#中使用ONVIF进行设备发现，并获取到设备的地址信息。