如果已经在这个问题上花费很多时间,我发现了很多不同的策略,但他们没有为我工作。 (此代码只是一个概念验证ofcourse)。
我一直在使用Asp.net 2.1核心下列设置(.Net的Framwork 4.7.2):
我已经由具有发送号码的方法的signalr毂:
using System.Threading.Tasks;
using Microsoft.AspNetCore.SignalR;
namespace TestRandomNumberSignalR
{
public class TestHub : Hub
{
public async Task SendRandomNumber(int number)
{
await Clients.All.SendAsync("ReceiveRandomBumber", number);
}
}
}
我还做了一个类更新一个随机数,每3秒,增加一条,作为一个单身:
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
namespace TestRandomNumberSignalR
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddSingleton(new UpdateRandomNumber());
services.AddSignalR();
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseMvc();
app.UseSignalR(routes =>
{
routes.MapHub<TestHub>("/testHub");
});
}
}
}
这里是随机数类:
using System;
using System.Threading;
using System.Threading.Tasks;
namespace TestRandomNumberSignalR
{
public class UpdateRandomNumber
{
private bool _continue = true;
public UpdateRandomNumber()
{
var task = new Task(() => RandomNumberLoop(),
TaskCreationOptions.LongRunning);
task.Start();
}
private void RandomNumberLoop()
{
Random r = new Random();
while (_continue)
{
Thread.Sleep(3000);
int number = r.Next(0, 100);
Console.WriteLine("The random number is now " + number);
// Send new random number to connected subscribers here
// Something like TestHub.SendRandomNumber(number);
}
}
public void Stop()
{
_continue = false;
}
}
}
现在,从这个类(正如我在评论中写道)我想给使用SignalR新的随机数。只有如何让枢纽背景在那里?
此外,我希望能够到控制器内访问类的stop()方法,我怎么可以访问?
我现在这是一个好讨论的话题,但我仍然不能在任何地方找到一个可行的解决方案。希望您能够帮助我。
编辑
问题1
而随机循环已开始(与许多感谢rasharasha),还存在一些问题依然存在。我现在无法注射合适的UpdateRandomNumber到控制器。可以说,我希望能够停止循环调用UpdateRandomNumber.Stop()方法,我怎么能注入UpdateRandomNumber单到控制器。我试图创建一个界面:
public interface IUpdateRandomNumber
{
void Stop();
}
更改RandomNumber方法来实现这一点:
public class UpdateRandomNumber : IUpdateRandomNumber
{
private bool _continue = true;
private IHubContext<TestHub> testHub;
public UpdateRandomNumber(IHubContext<TestHub> testHub)
{
this.testHub = testHub;
var task = new Task(() => RandomNumberLoop(),
TaskCreationOptions.LongRunning);
task.Start();
}
private void RandomNumberLoop()
{
Random r = new Random();
while (_continue)
{
Thread.Sleep(3000);
int number = r.Next(0, 100);
Console.WriteLine("The random number is now " + number);
// Send new random number to connected subscribers here
// Something like TestHub.SendRandomNumber(number);
}
}
public void Stop()
{
_continue = false;
}
}
并改变addsingleton方法,因此将使用的接口:
services.AddSingleton<IUpdateRandomNumber>(provider =>
{
var hubContext = provider.GetService<IHubContext<TestHub>>();
var updateRandomNumber = new UpdateRandomNumber(hubContext);
return updateRandomNumber;
});
我现在可以用一种方法来阻止randomnumber循环创建一个控制器:
[Route("api/[controller]")]
[ApiController]
public class RandomController : ControllerBase
{
private readonly IUpdateRandomNumber _updateRandomNumber;
public RandomController(IUpdateRandomNumber updateRandomNumber)
{
_updateRandomNumber = updateRandomNumber;
}
// POST api/random
[HttpPost]
public void Post()
{
_updateRandomNumber.Stop();
}
然而,这种实现将阻止循环重新开始。那么,如何从控制器访问随机数单?
问题2
从我UpdateRandomNumber类我现在就可以拨打:
testHub.Clients.All.SendAsync("ReceiveRandomBumber", number);
但是为什么我在做我的testhub的方法:
public async Task SendRandomNumber(int number)
{
await Clients.All.SendAsync("ReceiveRandomBumber", number);
}
这将是更方便地创建轮毂的方法和他们直接调用它们。可以这样做?
您可以注入到TestHub使用构造器注入控制器。自从与已登记注册的DI容器。
public class UpdateRandomNumber
{
private bool _continue = true;
private IHubContext<TestHub> testHub;
private Task randomNumberTask;
public UpdateRandomNumber(IHubContext<TestHub> testHub)
{
this.testHub=testHub;
randomNumberTask = new Task(() => RandomNumberLoop(),
TaskCreationOptions.LongRunning);
randomNumberTask.Start();
}
private async void RandomNumberLoop()
{
Random r = new Random();
while (_continue)
{
Thread.Sleep(3000);
int number = r.Next(0, 100);
Console.WriteLine("The random number is now " + number);
// Send new random number to connected subscribers here
await testHub.Clients.All.SendAsync($"ReceiveRandomNumber", number);
}
}
public void Stop()
{
_continue = false;
}
}
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddSignalR();
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddSingleton(provider =>
{
var hubContext = provider.GetService<IHubContext<TestHub>>();
var updateRandomNumber = new UpdateRandomNumber(hubContext);
return updateRandomNumber;
});
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
var updateRandonNumber = app.ApplicationServices.GetService<UpdateRandomNumber>();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseMvc();
app.UseSignalR(routes =>
{
routes.MapHub<TestHub>("/testHub");
});
}
}