ASP.Net Core 2.1 Log layout in Azure Diagnostics Blob Storage

Question

I have an ASP.Net Core 2.1 API running in a Azure AppService, the Azure Diagnostics Log "Application Logging (Blob)" is turned on.

The problem is that it's just logging with the default format "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level}] {Message}{NewLine}{Exception}".

I would like to store the logs in exact same format as ASP.NET Framework 4.7, in .CSV and with information like date/level in different columns.

If it's not possible, I would like at least store just the {Message} and not the whole timestamp.

Example of ASP.NET Framework 4.7 logs in Blob Storage: ASP.Net Framework Log File

Example of ASP.NET Core 2.1 logs in Blob Storage: ASP.Net Core 2.1 Log File

My log configuration: ILoggerFactory configuration

Answer 1

I'm afraid you'll need a custom logger to achieve what you want.

Take a look at Customizing ASP.​NET Core Part 01: Logging and How to add custom logging in ASP.NET Core to see how it can be done.

Hope it helps!