在Blazor Server中,当使用WebSocket与客户端通信时,可能需要使用AsyncLocal来存储和传递数据。但是,由于WebSocket使用的是不同的线程,因此AsyncLocal的值在不同线程之间不会自动传递。因此,需要使用System.Threading.ExecutionContext来手动将AsyncLocal的值从一个线程传递到另一个线程。
以下是具有WebSocket和AsyncLocal功能的示例代码:
首先,在Server项目中创建一个名为WebSocketContext.cs的类来存储WebSocket和AsyncLocal数据:
public class WebSocketContext
{
public WebSocket WebSocket { get; set; }
public AsyncLocal
接下来,在Blazor组件中创建WebSocket连接和上下文:
@page "/"
@using System.Net.WebSockets @using System.Threading @using Microsoft.AspNetCore.Components @inject NavigationManager NavigationManager
@code {
ClientWebSocket _webSocket;
WebSocketContext _webSocketContext;
private async Task Connect()
{
_webSocket = new ClientWebSocket();
await _webSocket.ConnectAsync(new Uri(NavigationManager.ToAbsoluteUri("/ws")), CancellationToken.None);
_webSocketContext = new WebSocketContext { WebSocket = _webSocket };
_webSocketContext.Value.Value = "test";
var receiveThread = new Thread(async () =>
{
var buffer = new byte[4096];
WebSocketReceiveResult result;
while (_webSocket.CloseStatus.HasValue == false)
{
result = await _webSocket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);
if (result.MessageType == WebSocketMessageType.Text && result.EndOfMessage)
{
// Receive message from client
var message = Encoding.UTF8.GetString(buffer, 0, result.Count);
Console.WriteLine($"Message received: {message}");
// Get the AsyncLocal value
Console.WriteLine($"AsyncLocal value: {_webSocketContext.Value.Value}");
}
}
});
receiveThread.Start();
}
}
在此示例中,每当与客户端通信时,AsyncLocal的值都将传递