Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.

   at ConsoleApp.Processor.<>c.<NextStageProcessing>b__1_0(String x) in C:\Project\ConsoleApp1\ConsoleApp1\Processor.cs:line 21

   at System.Linq.Enumerable.SelectListIterator`2.ToList()

   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

   at ConsoleApp.Processor.NextStageProcessing(List`1 items) in C:\Project\ConsoleApp1\ConsoleApp1\Processor.cs:line 21

   at ConsoleApp.Processor.Start(Int32 count) in C:\Project\ConsoleApp1\ConsoleApp1\Processor.cs:line 16

   at Program.<Main>$(String[] args) in C:\Project\ConsoleApp1\ConsoleApp1\Program.cs:line 5

// ===================================

// ===================================

// ===================================  

​

​

class MyForm: Form 

{

    private static readonly HttpClient httpClient = new HttpClient();

​

    private async void downloadBtn_Click(object sender, RoutedEventArgs e)

    {

        string text = await httpClient.GetStringAsync("http://example.com/currenttime").ConfigureAwait(false);

        downloadBtn.Content = text;

    }

}

​

// ===================================

// ===================================

// ===================================

​

public class AsyncController : Controller

{

    [HttpGet("/async")]

    public async void Get()

    {

        await Task.Delay(1000);

​

        _ = Task.Run(async () =>

        {

            await Task.Delay(1000);

​

            var path = HttpContext.Request.Path;

            Log(path);

        });

        await Response.WriteAsync("Hello World");

    }

}

​

​