.NET 6网络应用程序接口(API):
Blazor服务器应用程序:
回调监听器:
在.NET 6 API中,可以使用中间件或事件处理器来实现回调监听器。例如,当某个资源被创建或更新时,可以触发一个回调函数。
public class ResourceCreatedEventArgs : EventArgs
{
public string ResourceId { get; set; }
}
public class ResourceController : ControllerBase
{
private readonly IEventPublisher _eventPublisher;
public ResourceController(IEventPublisher eventPublisher)
{
_eventPublisher = eventPublisher;
}
[HttpPost]
public IActionResult CreateResource(Resource resource)
{
// 创建资源逻辑...
// 发布事件
_eventPublisher.Publish(new ResourceCreatedEventArgs { ResourceId = resource.Id });
return CreatedAtAction(nameof(GetResource), new { id = resource.Id }, resource);
}
}
public interface IEventPublisher
{
void Publish<T>(T eventData) where T : EventArgs;
}
public class EventPublisher : IEventPublisher
{
private readonly List<IEventHandler> _handlers;
public EventHandler()
{
_handlers = new List<IEventHandler>();
}
public void Subscribe(IEventHandler handler)
{
_handlers.Add(handler);
}
public void Publish<T>(T eventData) where T : EventArgs
{
foreach (var handler in _handlers)
{
if (handler.CanHandle(eventData))
{
handler.Handle(eventData);
}
}
}
}
public interface IEventHandler
{
bool CanHandle(EventArgs eventData);
void Handle(EventArgs eventData);
}
在Blazor服务器应用程序中,可以使用SignalR来实现回调监听器。例如,当服务器端数据更新时,可以通知客户端进行实时更新。
@page "/fetchdata"
@inject HttpClient Http
@inject NavigationManager NavigationManager
@implements IDisposable
<h3>Fetch data</h3>
<p>@message</p>
@code {
private HubConnection hubConnection;
private string message = "Initial message";
protected override async Task OnInitializedAsync()
{
hubConnection = new HubConnectionBuilder()
.WithUrl(NavigationManager.ToAbsoluteUri("/chathub"))
.Build();
hubConnection.On<string>("ReceiveMessage", (msg) =>
{
message = msg;
StateHasChanged();
});
await hubConnection.StartAsync();
}
public async ValueTask DisposeAsync()
{
if (hubConnection != null)
{
await hubConnection.DisposeAsync();
}
}
}
问题1:回调监听器未触发
原因:
解决方法:
问题2:回调监听器执行顺序问题
原因:
解决方法:
async
和await
确保异步操作按预期顺序执行。问题3:回调监听器性能问题
原因:
解决方法:
希望这些信息对你有所帮助!如果有更多问题,请随时提问。
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