Add TraceIdentifier for ASP.Net Core

[luciusli]

I have a middleware that add a HTTP response header with the value of HttpContext.TraceIdentifier. It would be really useful if I could log the corresponding TraceIdentifier to find out what went wrong in case of errors. Thank you.

[304NotModified]

Do you have the c# code to read the TraceIdentifier in .NET Core?

[luciusli]

Something like this

[LayoutRenderer("aspnet-traceidentifier")]
public class AspNetTraceIdentifierLayoutRenderer : AspNetLayoutRendererBase
{
    protected override void DoAppend(StringBuilder builder, LogEventInfo logEvent)
    {
        var context = HttpContextAccessor.HttpContext;

        builder.Append(context.TraceIdentifier);
    }
}

[304NotModified]

if this works, please create a PR :)

(and or support ASP.NET 4 or exclude with #if)

[304NotModified]

Added in 4.3.1! Thanks for the code!