我有一个循环,整个客户端一直在页面上运行,但是我无法关闭循环,因此即使用户已经断开连接也始终保持运行状态。用户关闭连接时,是否存在运行的生命周期方法?还是有其他方法?
我不确定仅实现IDisposable接口可以在这里为您提供帮助,但是实现Blazor Server电路处理程序可能会有所帮助。我隐约记得在stackoverflow中曾问过一个与您类似的问题... OP试图实现IDisposable接口,但无济于事。我已经回答了该问题一两次,然后又回答了一个问题...我正在从答案中发布代码,希望这对您有所帮助...
using Microsoft.AspNetCore.Components.Server.Circuits;
using System;
using System.Collections.Concurrent;
using System.Threading;
using System.Threading.Tasks;
namespace BlazorCircuitHandler.Services
{
public class CircuitHandlerService : CircuitHandler
{
public ConcurrentDictionary<string, Circuit> Circuits { get; set; }
public event EventHandler CircuitsChanged;
protected virtual void OnCircuitsChanged()
=> CircuitsChanged?.Invoke(this, EventArgs.Empty);
public CircuitHandlerService()
{
Circuits = new ConcurrentDictionary<string, Circuit>();
}
public override Task OnCircuitOpenedAsync(Circuit circuit,
CancellationToken cancellationToken)
{
Circuits[circuit.Id] = circuit;
OnCircuitsChanged();
return base.OnCircuitOpenedAsync(circuit, cancellationToken);
}
public override Task OnCircuitClosedAsync(Circuit circuit,
CancellationToken cancellationToken)
{
Console.WriteLine("OnCircuitClosedAsync");
Circuit circuitRemoved;
Circuits.TryRemove(circuit.Id, out circuitRemoved);
OnCircuitsChanged();
return base.OnCircuitClosedAsync(circuit, cancellationToken);
}
public override Task OnConnectionDownAsync(Circuit circuit,
CancellationToken cancellationToken)
{
Console.WriteLine("OnConnectionDownAsync");
return base.OnConnectionDownAsync(circuit, cancellationToken);
}
public override Task OnConnectionUpAsync(Circuit circuit,
CancellationToken cancellationToken)
{
return base.OnConnectionUpAsync(circuit, cancellationToken);
}
}
}
@page "/"
@using Microsoft.AspNetCore.Components.Server.Circuits
@using BlazorCircuitHandler.Services
@inject CircuitHandler circuitHandler
@implements IDisposable
<h1>Hello, world!</h1>
Welcome to your new app.
<p>
Number of Circuits: @((circuitHandler as
BlazorCircuitHandler.Services.CircuitHandlerService).Circuits.Count)
<ul>
@foreach (var circuit in (circuitHandler as
BlazorCircuitHandler.Services.CircuitHandlerService).Circuits)
{
<li>@circuit.Key</li>
}
</ul>
</p>
@code {
protected override void OnInitialized()
{
// register event handler
(circuitHandler as CircuitHandlerService).CircuitsChanged +=
HandleCircuitsChanged;
}
public void Dispose()
{
// unregister the event handler when the component is destroyed
(circuitHandler as CircuitHandlerService).CircuitsChanged -=
HandleCircuitsChanged;
}
public void HandleCircuitsChanged(object sender, EventArgs args)
{
// notify the UI that the state has changed
InvokeAsync(() => StateHasChanged());
}
}
public void ConfigureServices(IServiceCollection services)
{
// ........ .....
services.AddSingleton<CircuitHandler>(new CircuitHandlerService());
}
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