.Net Core 2.1 - Cannot access a disposed object.Object name: 'IServiceProvider'

In my case issue was in Startup.cs

public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider services)
{
   var svc = services.GetService<IService>(); // <-- exception here
}

just replace services.GetService<>() with app.ApplicationServices.GetService<>()

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
   var svc = app.ApplicationServices.GetService<IService>(); // no exception
}

hope it helps

If you create any transient service, such as services.AddTransient... then .net core will dispose the service provider. This is a bug as of .net core 2.2.

I would suggest that instead of calling services.GetService<IHttpContextAccessor>(), inject IHttpContextAccessor to the constructor and use aprivate field to store the value.

public AppContractResolver(IServiceProvider services, 
                           IHttpContextAccessor httpContextAccessor)
{
   _services = services;
   this.httpContextAccessor = httpContextAccessor;
}

Also HttpContextAccessor has to be registered manually. In RegisterServices in Startup.cs add, services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();