.NET Core API之格式化输出对象OutputFormatter

public class ResponseDto
{
    public int code { get; set; }
    public string msg { get; set; }
    public object data { get; set; }
}

public IActionResult Success(object data)
{
	return ......
}
public IActionResult Fail(string msg)
{
	return ......
}

[HttpGet]
public IActionResult Get()
{
	var data = new WeatherForecast() { Date = DateTime.Now };
	return Success(data);
}

[Produces("application/xml")]
[HttpGet]
public WeatherForecast Get()
{
	return new WeatherForecast() { Date = DateTime.Now };
}

services.AddControllers((c) =>
{
	c.OutputFormatters.Add(new XmlDataContractSerializerOutputFormatter());
});

public class ObjectOutputFormatter : TextOutputFormatter
{
	public ObjectOutputFormatter()
	{
		SupportedEncodings.Add(Encoding.UTF8);
		SupportedEncodings.Add(Encoding.Unicode);
		// 这就是我们自定义contentType的名称
		SupportedMediaTypes.Add("text/object");
	}

	public override async Task WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
	{
		if (context == null)
		{
			throw new ArgumentNullException(nameof(context));
		}
		if (selectedEncoding == null)
		{
			throw new ArgumentNullException(nameof(selectedEncoding));
		}
		string text = JsonConvert.SerializeObject(new ResponseDto()
		{
			msg = "成功，自定义的哦",
			code = 200,
			data = context.Object
		});
		var response = context.HttpContext.Response;
		await response.WriteAsync(text, selectedEncoding);
	}
}

[Produces("text/object")]
[HttpGet]
public WeatherForecast Get()
{
	return new WeatherForecast() { Date = DateTime.Now };
}

public void ConfigureServices(IServiceCollection services)
{
	services.AddControllers((c) =>
	{
		c.OutputFormatters.Add(new XmlDataContractSerializerOutputFormatter());
		// 我们自定义的输出格式
		c.OutputFormatters.Add(new ObjectOutputFormatter());
	});
}

public class ResultFilter : ActionFilterAttribute
{
    public override void OnResultExecuting(ResultExecutingContext context)
    {
        ResponseDto result = new ResponseDto();
        result.code = 200;
        result.msg = "成功，ResultFilter";
        var properties = context.Result.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);
        result.data = properties.FirstOrDefault(c => c.Name == "Value").GetValue(context.Result);
        context.Result = new JsonResult(result);
        base.OnResultExecuting(context);
    }
}

[TypeFilter(typeof(ResultFilter))]
[HttpGet]
public WeatherForecast Get()
{
	return new WeatherForecast() { Date = DateTime.Now };
}

[Produces("text/object")]
[TypeFilter(typeof(ResultFilter))]
[HttpGet]
public WeatherForecast Get()
{
	return new WeatherForecast() { Date = DateTime.Now };
}