无法从 POST/PUT 请求中获取资源（.NET FHIR 客户端，网络 api 2）

Question

当我尝试使用 .NET FHIR API 向 asp.net Web API 2 服务器发送 POST / PUT 请求时，我收到错误消息：

Hl7.Fhir.Rest.FhirOperationException: the operation failed due to a
client error (UnsupportedMediaType). The body has no content.

1) 我是否需要创建某种媒体类型处理程序/格式化程序？

2) 是否有代码实现 .NET FHIR 最佳实践的开源服务器API？

我查看了 Fiddler，似乎客户端在正文中发送了正确的 JSON

fhirClient = new FhirClient(serverUrl);
fhirClient.PreferredFormat = ResourceFormat.Json;

Patient patient = new Patient();
//fill patient

    var response = fhirClient.Update(patient);

...
// 网络 api 2 服务器： WebApiConfig.cs:

config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/fhir+json"));

我试过了：

[HttpPut]
public void Update([FromBody] Resource resource, string id = null)
{
// updating logic
}

//or
[HttpPut]
public void Update(Resource resource, string id = null)
{
// updating logic
}

但是，当我尝试

[HttpPut]
public void Update([FromBody] object resource, string id = null)
{

我可以在 "object" 内部看到反序列化的 Patient 并使用 jsonParser 将其取回

Answer 1

看来，我必须自己编写 Fhir MediaTypeFormatter 我用谷歌搜索并找到 this code:

 public class JsonFhirFormatter : FhirMediaTypeFormatter
    {
        private readonly FhirJsonParser _parser = new FhirJsonParser();
        private readonly FhirJsonSerializer _serializer = new FhirJsonSerializer();

        public JsonFhirFormatter() : base()
        {
            foreach (var mediaType in ContentType.JSON_CONTENT_HEADERS)
                SupportedMediaTypes.Add(new MediaTypeHeaderValue(mediaType));
        }

        public override void SetDefaultContentHeaders(Type type, HttpContentHeaders headers, MediaTypeHeaderValue mediaType)
        {
            base.SetDefaultContentHeaders(type, headers, mediaType);
            headers.ContentType = FhirMediaType.GetMediaTypeHeaderValue(type, ResourceFormat.Json);
        }

        public override Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
        {
            try
            {
                var body = base.ReadBodyFromStream(readStream, content);

                if (typeof(Resource).IsAssignableFrom(type))
                {
                    Resource resource = _parser.Parse<Resource>(body);
                    return Task.FromResult<object>(resource);
                }
                else
                {
                    throw Error.Internal("Cannot read unsupported type {0} from body", type.Name);
                }
            }
            catch (FormatException exception)
            {
                throw Error.BadRequest("Body parsing failed: " + exception.Message);
            }
        }

        public override Task WriteToStreamAsync(Type type, object value, Stream writeStream, HttpContent content, TransportContext transportContext)
        {
            using(StreamWriter streamwriter = new StreamWriter(writeStream))
            using (JsonWriter writer = new JsonTextWriter(streamwriter))
            {
                SummaryType summary = requestMessage.RequestSummary();

                if (type == typeof(OperationOutcome))
                {
                    Resource resource = (Resource)value;
                    _serializer.Serialize(resource, writer, summary);
                }
                else if (typeof(Resource).IsAssignableFrom(type))
                {
                    Resource resource = (Resource)value;
                    _serializer.Serialize(resource, writer, summary);
                }
                else if (typeof(FhirResponse).IsAssignableFrom(type))
                {
                    FhirResponse response = (value as FhirResponse);
                    if (response.HasBody)
                    {
                        _serializer.Serialize(response.Resource, writer, summary);
                    }
                }
            }

            return Task.CompletedTask;
        }
    }

并在Global.asax

中注册

Answer 2

事实上，另请参阅此处：HL7 FHIR serialisation to json in asp.net web api - 该答案基于您在上面找到的代码。

Answer 3

其中有几个选项，包括 github 上的开源 fhir-net-web-api 项目。有一个aspnetcore版本，还有一个完整的框架owin版本。检查那里的示例项目以了解如何使用它们。

无法从 POST/PUT 请求中获取资源（.NET FHIR 客户端，网络 api 2）

Can't get Resource from POST/PUT request (.NET FHIR client, web api 2)

hl7-fhir

asp.net-web-api2