Are there any examples of using the new logging system in MvvmCross 6

MvvmCross 6 and 7

In these versions, you would typically use `IMvxLog` and `IMvxLogProvider`. Here’s how you can implement logging in a ViewModel:

csharp
public class MyViewModel : MvxViewModel
{
    private readonly IMvxLog _log;

    public MyViewModel(IMvxLogProvider logProvider)
    {
        _log = logProvider.GetLogFor();
    }

    private void SomeMethod()
    {
        _log.ErrorException("Some message", new Exception());
    }
}

To use logging outside of a ViewModel, such as in a View or Model, you can resolve the `IMvxLogProvider` using the IoC container:

csharp
var logProvider = Mvx.IoCProvider.Resolve();
var log = logProvider.GetLogFor();
log.Trace("Some message");

MvvmCross 8 and Later

In MvvmCross 8 and later, the logging system is based on `Microsoft.Extensions.Logging`. You can inject either `ILogger` or `ILoggerFactory` into your classes. Here’s how to use it in a ViewModel:

csharp
public class MyViewModel : MvxViewModel
{
    private readonly ILogger _logger;

    public MyViewModel(ILogger logger)
    {
        _logger = logger;
    }

    private void SomeMethod()
    {
        _logger.Log(LogLevel.Trace, "Hello, World");
    }
}

To customize logging, you can use third-party providers like Serilog. You need to override `CreateLogProvider` and `CreateLogFactory` in your `Setup.cs`:

csharp
public class Setup : MvxWpfSetup
{
    protected override ILoggerProvider CreateLogProvider()
    {
        return new SerilogLoggerProvider();
    }

    protected override ILoggerFactory CreateLogFactory()
    {
        Log.Logger = new LoggerConfiguration()
            .MinimumLevel.Debug()
            .CreateLogger();
        return new SerilogLoggerFactory();
    }
}

This setup allows you to use Serilog for structured logging and supports various sinks for logging to different outputs like files, console, or even specific platforms like Android or iOS.