IFeatureCollection is disposed Object name: Collection in a Task? - asp.net-core

Question

I want to run a Task to save the logs into a database table.
But it seems like that the HttpContext is disposedin the other thread.
Here is my code:
_ = Task.Run(() =>
{
using (var db = LogContext())
{
var request = new LoginLog
{
Url = context.HttpContext.Request.Path,
UserAgent = context.HttpContext?.Request?.Headers?[HeaderNames.UserAgent].ToString()
};
await db.AddAsync(request);
db.SaveChanges();
}
});
Here is the exception trackInfo:
at Microsoft.AspNetCore.Http.Features.FeatureReferences`1.ThrowContextDisposed()
at Microsoft.AspNetCore.Http.Features.FeatureReferences`1.Fetch[TFeature, TState](TFeature & cached, TState state, Func`2 factory)
at Microsoft.AspNetCore.Http.DefaultHttpRequest.get_Path()
at PowerMan.Applet.Api.Infrastructure.Filters.RequestFilter.<> c__DisplayClass4_0.< OnActionExecutionAsync > b__1() in / Users / zhaojing / Projects / PowerMan.Api / PowerMan / PowerMan.Applet / PowerMan.Applet.Api / Infrastructure / Filters / RequestFilter.cs:line 112
at System.Threading.Tasks.Task.InnerInvoke()
at System.Threading.Tasks.Task.<> c.<.cctor > b__274_0(Object obj)
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
Is it the Task which make the exceptions?

Answer 1

Most definitely the context is disposed after the request completes.
So you will need to capture the values you will need before starting the background operation:
var url = context.HttpContext.Request.Path;
var userAgent = context.HttpContext?.Request?.Headers?[HeaderNames.UserAgent].ToString();
_ = Task.Run(() =>
{
using (var db =LogContext())
{
var request = new LoginLog
{
Url = url,
UserAgent = userAgent
};
await db.AddAsync(request);
db.SaveChanges();
}
});