How to include client's IP address in the ASP.NET Core logging with log4net?

Question

Is there any message template or other technique available to capture the client's IP address and print that in each log using log4net?

At this moment, I have the following conversion pattern for log4net

 <conversionPattern value="%date [%thread] %level %logger - %message%newline%exception" />

So, I am not sure, if I simply add a placeholder for getting the IP address, Will log4bet magically know the client's IP address and print that?

OR do I need to configure my ASP.Net Core 3.1 website as well?

This is my current "CreateHostBuilder method.

public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureLogging(logging =>
                {
                    logging.ClearProviders();
                    logging.AddLog4Net();
                })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });

So, do I also need to make some changes to this method?

Emran Hussain · Accepted Answer · 2020-06-13 02:19:38Z

2

Ok, finally, I found the solution. So, I am answering my own question.

I have created a middleware snippet like this:

    app.Use(async (httpContext, next) =>
    {
        log4net.ThreadContext.Properties["ipAddress"] =
                                          httpContext?.Connection?.RemoteIpAddress;

         await next();
    });

Then, I have placed the middleware snippet within the Configure method in Startup.cs file as shown below.

Then, in my log4net config file, I added %property{ipAddress} in the conversion pattern value.

Then, I see the IP address logged in the log file. I Hope, this solution will help someone who needs it.

edited Jun 13, 2020 at 2:19

answered Jun 11, 2020 at 0:15

Emran Hussain

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