Detecting a disconnection from SSE on ASP.NET Core

Question

I want to detect a disconnection from SSE (Server Send Events) on ASP.NET Core. Old way Response.IsClientConnected not working. Do you have solution for this problem?

Answer 1

I found temporary solution to my question. Temporary because IsCancellationRequested is detected when trying to send request and it failed, not when user disconnected before send request

if (HttpContext.RequestAborted.IsCancellationRequested == true)
{
     break;
} 

Answer 2

In .NET Core 2.0:

This method creates an endpoint that will return null after 60 seconds. If the request is cancelled during those 60 seconds the method will return null immediately.

[HttpGet]
public async Task<string> Get()
{
    Request.HttpContext.RequestAborted.WaitHandle.WaitOne(60000);
    return null;
}

This method does multiple units of work while the request is connected and until the work is completed.

[HttpGet]
public async Task<Items[]> Get()
{
    Item item = null;
    List<Items> items = new List<Items>();
    do
    {
        item = DoRepitiousWork();
        Items.Add(item);
    }
    while (!Request.HttpContext.RequestAborted.IsCancellationRequested && !item.IsLast);
    return items.ToArray();
}