AJAX在C#中處理WebSocket連接超時的方法

在C#中，處理WebSocket連接超時可以通過設置CancellationTokenSource來實現。以下是一個簡單的示例，展示了如何在C#中使用AJAX處理WebSocket連接超時：

1. 首先，安裝System.Net.WebSockets庫，以便使用WebSocket類。

2. 創建一個名為WebSocketClient的類，用于處理WebSocket連接：

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類連接到WebSocket服務器，并設置超時：

using System;
using System.Threading.Tasks;

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

        try
        {
            // 設置連接超時為5000毫秒（5秒）
            await webSocketClient.ConnectAsync(5000);

            // 發送消息并設置發送超時為3000毫秒（3秒）
            await webSocketClient.SendAsync("Hello, WebSocket!", 3000);

            // 接收消息并設置接收超時為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();
        }
    }
}

這個示例中，我們設置了連接、發送和接收操作的超時時間。如果操作在指定的超時時間內未完成，將拋出OperationCanceledException異常。你可以根據需要調整超時值。