WCF post json and return json

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[OperationContract]

        [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest)]

        [SwaggerWcfTag(nameof(GetUTCRange))]

        [SwaggerWcfContentTypes(new

                    string[] { "text/plain" })]

            public Stream GetUTCRange(Stream streamdata)

        {

            using (StreamReader reader = new StreamReader(stream))

            {

            string res = reader.ReadToEnd();

                reader.Close();

                // return res; //读取动态JSON参数

            }

            WebOperationContext.Current.OutgoingResponse.ContentType = "application/json";  //修改返回的声明

            return

                    new JsonResponse() { code = 1, msg = $"invalid tableName {json.tableName}" }.ToStream();

        }

            public

                    static Stream ToStream(this JsonResponse json, bool none = true)

        {

            return

                    new MemoryStream(System.Text.Encoding.UTF8.GetBytes(json.Serialize(none)));

        }