SignalR:带有计时器的System.ObjectDisposedException [英] SignalR: System.ObjectDisposedException with timer

问题描述

我正在使用signalR，我想每2秒向我的客户发送一条小消息.因此，我遵循了

解决方案

我可以看到此处:

不要将状态存储在集线器类的属性中.每个集线器方法调用都在一个新的集线器实例上执行.

因此，我决定搜索如何为我的中心创建服务.这就是 Medium 的作用.(下载他们的解决方案，因为他们的教程中遗漏了很多东西)

在我的中心中创建计时器是一种错误的方法.

已解决.

I'm playing with signalR and I want to send every 2s a little message to my clients. So I followed this tutorial, and it works good for chatting, now, I want to implement my timer. Then, I made this (ASP.NET .NET Core 3.1):

public ChatHub()
{
    Debug.WriteLine("hello");
    var timer1 = new Timer();
    timer1.Elapsed += this.Timer1_Elapsed;
    timer1.Interval = 2000;
    timer1.Start();
}

private async void Timer1_Elapsed(object sender, ElapsedEventArgs e)
{
    Debug.WriteLine("tick");
    await SendMessage("user", "hello");
}

public async Task SendMessage(string user, string message)
{
    await Clients.All.SendAsync("ReceiveMessage", user, message);
}

But everytime, I get this error (in this.Clients.Add...):

System.ObjectDisposedException: Cannot access a disposed object.

And I don't understand why, I checked stackoverflow, tried some solutions, but i'm already stuck.

Thank for your help.

---

Sample: https://github.com/Naografix/SignalRProblem

Stacktrace:

Message = "Cannot access a disposed object.\r\nObject name: 'HomeHub'."
at Microsoft.AspNetCore.SignalR.Hub.CheckDisposed()
at Microsoft.AspNetCore.SignalR.Hub.get_Clients()
at ****.HomeHub.<Timer1_Elapsed>d__1.MoveNext() in *****.Api\Hubs\HomeHub.cs:line 32

解决方案

I can see here this:

Don't store state in a property on the hub class. Every hub method call is executed on a new hub instance.

So I decided to search how to create a service for my hub. And this is what Medium does. (Download their solution because lot of things are missing in their tutorial)

Creating a timer in my hub was a bad approach.

Solved.

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