如何在 ASP.NET Core Startup 中向 Newtonsoft JSON 添加自定义 ITraceWriter？

Question

I want to add a custom trace writer to help with debugging JSON calls. I have implemented an ITraceWriter class but can find no documentation on how to add it to this call. Any help would be appreciated.

services.AddControllers().AddNewtonsoftJson()

And the object

public class JSONTraceWriter : Newtonsoft.Json.Serialization.ITraceWriter
{
    public TraceLevel LevelFilter
    {
        get
        {
            return TraceLevel.Error;
        }
    }

    TraceLevel ITraceWriter.LevelFilter => TraceLevel.Error;


    public void Trace(TraceLevel level, string message, Exception ex)
    {
        SiAuto.Main.LogMessage($"JSONTraceWriter: {message}");
        SiAuto.Main.LogException("JSONTracerWriter", ex);
    }
}

Answer 1

You can add a custom trace writer by setting JsonSerializerSettings.TraceWriter in MvcNewtonsoftJsonOptions.SerializerSettings when calling AddNewtonsoftJson(this IMvcCoreBuilder, Action<MvcNewtonsoftJsonOptions>) :

services.AddControllers()
    .AddNewtonsoftJson(options =>
    {
        options.SerializerSettings.TraceWriter = new JSONTraceWriter();
    });