Nlog: Log ASP User ID

[Paul-ICS]

Is there a way to log the ASP User ID, rather than the username?
I've looked through: https://github.com/NLog/NLog/wiki/Layout-Renderers but can't see anything obvious.
Currently we are using ${aspnet-user-identity} but that only logs the username, which can change, therefore causes problems with the logs.

Type:

• Question

NLog version:
v4.0.1

Platform:
.Net 4.5

Current NLog config
xml

Thanks,
Paul

[304NotModified]

This is currently not there, but maybe easy to add.

Where is the ID stored? As IIdentity (httpContext.Current.User) only has a Name?https://msdn.microsoft.com/en-us/library/system.security.principal.iidentity(v=vs.110).aspx

[Paul-ICS]

We are using a IdentityUser to get the ID.
https://msdn.microsoft.com/en-us/library/microsoft.aspnet.identity.entityframework.identityuser%28v=vs.108%29.aspx

[304NotModified]

We have no EntityFramework implementation. But it's easy to create your own:

something like this:

``` c#
[LayoutRenderer("IdentityUser")]
public class IdentityUserLayoutRenderer : LayoutRenderer
{
protected override void Append(StringBuilder builder, LogEventInfo logEvent)
{
string name= ...; //todo

        builder.Append(name);
    }
}

//todo register

```

See http://nlog-project.org/2015/06/30/extending-nlog-is-easy.html

[Paul-ICS]

It was pretty easy to create my own!

I was going to add it to the project but it needs a reference to Microsoft.AspNet.Identity.Core and not sure if that would be something you would want to add.

Here's the code in case some one else wants it:

``` c#
using Microsoft.AspNet.Identity;
using NLog;
using NLog.LayoutRenderers;
using NLog.Web.LayoutRenderers;
using System.Text;

namespace IPoint.Web.Helpers.NLog
{
[LayoutRenderer("aspnet-user-id")]
public class AspNetUserIdLayoutRenderer : AspNetLayoutRendererBase
{
protected override void DoAppend(StringBuilder builder, LogEventInfo logEvent)
{
var context = HttpContextAccessor.HttpContext;

        if (context.User?.Identity == null)
        {
            return;
        }

        builder.Append(context.User.Identity.GetUserId());
    }
}

}
```

Thanks,
Paul

[304NotModified]

We try to keep the dependencies a low a possible, so adding this is indeed difficult.

Thanks for sharing!