net core 连接websock

要在.NET Core中连接WebSocket，你可以使用System.Net.WebSockets命名空间中的WebSocket类。

首先，你需要在你的项目中添加对System.Net.WebSockets的引用。然后，你可以使用以下代码示例连接到WebSocket服务器：

using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;

public class WebSocketClient
{
    private ClientWebSocket client;

    public async Task Connect(string url)
    {
        client = new ClientWebSocket();
        await client.ConnectAsync(new Uri(url), CancellationToken.None);
        
        // 连接成功后可以在这里执行一些操作
        Console.WriteLine("Connected to WebSocket server");
        
        // 启动接收消息的循环
        await ReceiveLoop();
    }
    
    private async Task ReceiveLoop()
    {
        var buffer = new byte[1024];
        while (true)
        {
            var result = await client.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
            if (result.MessageType == WebSocketMessageType.Text)
            {
                var message = System.Text.Encoding.UTF8.GetString(buffer, 0, result.Count);
                Console.WriteLine("Received message: " + message);
            }
        }
    }
    
    public async Task Send(string message)
    {
        var buffer = new ArraySegment<byte>(System.Text.Encoding.UTF8.GetBytes(message));
        await client.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
        Console.WriteLine("Sent message: " + message);
    }
    
    public async Task Close()
    {
        await client.CloseAsync(WebSocketCloseStatus.NormalClosure, "Connection closed by the client", CancellationToken.None);
        Console.WriteLine("WebSocket connection closed");
    }
}

使用上述代码，你可以通过调用Connect方法连接到WebSocket服务器，通过调用Send方法发送消息，通过调用Close方法关闭连接。

以下是一个使用上述WebSocketClient类的示例：

using System;
using System.Threading.Tasks;

public class Program
{
    public static async Task Main(string[] args)
    {
        var client = new WebSocketClient();
        await client.Connect("wss://example.com");
        
        // 发送一条消息
        await client.Send("Hello, WebSocket server!");
        
        // 等待一段时间
        await Task.Delay(1000);
        
        // 关闭连接
        await client.Close();
    }
}

请注意，上述示例中的URL应该是你要连接的WebSocket服务器的URL。