Custom Json Converter with dependecy

问题

I have to use a custom JsonConverter with ASP.NET Core for a reason, and I need to use it with JsonInputFormatter. The only way I've found is to use AddJsonOption extension method like this:

services
  .AddMvc()
  .AddJsonOptions(jso => jso.SerializerSettings.Converters.Add(new CustomConverter()))

But it has a flaw: CustomConverter requires a dependency from a DI container which cannot be easily solved at configuration time. So the question: is there any programmer friendly way to supply a JsonConverter with dependency to ASP.NET Core JsonInputFormatter?

回答1:

One quick workaround would be to postpone it to the Configure method.

public Confiugre(IAppBuilder app, IOptions<MvcOptions> mvcOptions, IOptions<MvcJsonOptions> jsonOptions) 
{
    var formatter = mvcOptions.InputFormatters.OfType<JsonInputFormatter>().Single();
    jsonOptions.SerializerSettings.Converters.Add(
        new CustomConverter(formatter));

    ...
}

Still feels a bit dirty though ;)

来源：https://stackoverflow.com/questions/41387357/custom-json-converter-with-dependecy