AJAX在C#中处理WebSocket连接超时的方法

在C#中，处理WebSocket连接超时可以通过设置CancellationTokenSource来实现。以下是一个简单的示例，展示了如何在C#中使用AJAX处理WebSocket连接超时：

1. 首先，安装System.Net.WebSockets库，以便使用WebSocket类。

2. 创建一个名为WebSocketClient的类，用于处理WebSocket连接：

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

public class WebSocketClient
{
    private readonly Uri _uri;
    private ClientWebSocket _webSocket;

    public WebSocketClient(string url)
    {
        _uri = new Uri(url);
        _webSocket = new ClientWebSocket();
    }

    public async Task ConnectAsync(int timeout)
    {
        using var cts = new CancellationTokenSource(TimeSpan.FromMilliseconds(timeout));
        await _webSocket.ConnectAsync(_uri, cts.Token);
    }

    public async Task SendAsync(string message, int timeout)
    {
        using var cts = new CancellationTokenSource(TimeSpan.FromMilliseconds(timeout));
        var buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(message));
        await _webSocket.SendAsync(buffer, WebSocketMessageType.Text, true, cts.Token);
    }

    public async Task<string> ReceiveAsync(int timeout)
    {
        using var cts = new CancellationTokenSource(TimeSpan.FromMilliseconds(timeout));
        var buffer = new ArraySegment<byte>(new byte[1024]);
        var result = await _webSocket.ReceiveAsync(buffer, cts.Token);
        return Encoding.UTF8.GetString(buffer.Array, 0, result.Count);
    }

    public async Task CloseAsync()
    {
        if (_webSocket.State == WebSocketState.Open)
        {
            await _webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Closing", CancellationToken.None);
        }
    }
}

3. 在你的主程序中，使用WebSocketClient类连接到WebSocket服务器，并设置超时：

using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var webSocketClient = new WebSocketClient("wss://your-websocket-server-url");

        try
        {
            // 设置连接超时为5000毫秒（5秒）
            await webSocketClient.ConnectAsync(5000);

            // 发送消息并设置发送超时为3000毫秒（3秒）
            await webSocketClient.SendAsync("Hello, WebSocket!", 3000);

            // 接收消息并设置接收超时为3000毫秒（3秒）
            var response = await webSocketClient.ReceiveAsync(3000);
            Console.WriteLine($"Received: {response}");
        }
        catch (OperationCanceledException)
        {
            Console.WriteLine("WebSocket operation timed out.");
        }
        finally
        {
            await webSocketClient.CloseAsync();
        }
    }
}

这个示例中，我们设置了连接、发送和接收操作的超时时间。如果操作在指定的超时时间内未完成，将抛出OperationCanceledException异常。你可以根据需要调整超时值。