用c#写一段websocket

以下是一个简单的C# WebSocket程序，用于建立WebSocket连接并发送和接收消息：

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

namespace WebSocketProgram
{
    class Program
    {
        static async Task Main(string[] args)
        {
            Console.WriteLine("WebSocket Program\n");

            // WebSocket endpoint
            Console.Write("Enter WebSocket endpoint: ");
            Uri uri = new Uri(Console.ReadLine());

            // Create client WebSocket
            ClientWebSocket clientWebSocket = new ClientWebSocket();
            await clientWebSocket.ConnectAsync(uri, CancellationToken.None);

            // Send message
            Console.Write("\nEnter message to send: ");
            string message = Console.ReadLine();
            byte[] messageBytes = Encoding.UTF8.GetBytes(message);
            await clientWebSocket.SendAsync(new ArraySegment<byte>(messageBytes), WebSocketMessageType.Text, true, CancellationToken.None);

            // Receive message
            byte[] buffer = new byte[1024];
            WebSocketReceiveResult result = await clientWebSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
            string receivedMessage = Encoding.UTF8.GetString(buffer, 0, result.Count);
            Console.WriteLine("\nReceived message: " + receivedMessage);

            // Close WebSocket
            await clientWebSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Closing connection", CancellationToken.None);

            Console.WriteLine("\nPress any key to exit.");
            Console.ReadKey();
        }
    }
}

该程序要求输入WebSocket端点，然后创建客户端WebSocket并连接到端点。它还要求输入要发送的消息，并将其作为UTF8编码的字节数组发送到服务器。然后，它接收来自服务器的消息，并将其作为UTF8编码的字符串打印出来。最后，该程序关闭WebSocket连接。注意：该程序只是一个简单的示例，实际的WebSocket程序需要更多的功能和异常处理。