Handling exceptions on ASP.NET Core web posting to Application Insights

aspnet-ai-telemetry-trackException.cs

// **********************************************
// Fore more information, visit: 
// https://blog.hildenco.com/2020/03/adding-application-insights-telemetry.html
// **********************************************
[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
public IActionResult Error()
{ 
    // IExceptionHandlerPathFeature requires Microsoft.AspNetCore.Diagnostics
    // run: dotnet add package Microsoft.AspNetCore.Diagnostics --version 2.2.0
    var error = HttpContext.Features.Get<IExceptionHandlerFeature>();
    if (error != null)
    {
        _telemetry.TrackException(error.Error); 
    }

    return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
}