调用 EORI SOAP 服务的 C# 问题

Question

我正在尝试从 C# 应用程序中调用 EORI 验证开放接口，但没有得到任何结果。 我环顾了该站点，似乎没有任何有关如何执行此操作的文档。

网站：http://ec.europa.eu/taxation_customs/dds2/eos/news/newstar.jsp?Lang=en

WSDL：http://ec.europa.eu/taxation_customs/dds2/eos/validation/services/validation?wsdl

我创建了一个新的 C# 控制台应用程序并将 WSDL 添加为服务引用，然后尝试调用该服务但得到以下异常...

System.ServiceModel.CommunicationException: '服务器没有 提供有意义的答复；这可能是由合同引起的 不匹配、会话过早关闭或内部服务器错误。'

我使用了带数字的在线工具，它按预期返回数据 http://ec.europa.eu/taxation_customs/dds2/eos/eori_validation.jsp?Lang=en

还有其他人对此有过好运吗？

谢谢

Answer 1

感谢您的帮助，如果其他人遇到困难，下面是用于发出和发送请求的帮助类。

public class EoriModel
    {
        string _url;

        public EoriModel()
        {
            _url = "http://ec.europa.eu/taxation_customs/dds2/eos/validation/services/validation";  
        }

        public EoriResponseModel ValidateEoriNumber(string number)
        {
            if (number == null)
            {
                return null;
            }

            XmlDocument soapEnvelopeXml = CreateSoapEnvelope(number);
            HttpWebRequest webRequest = CreateWebRequest(_url);
            InsertSoapEnvelopeIntoWebRequest(soapEnvelopeXml, webRequest);

            IAsyncResult asyncResult = webRequest.BeginGetResponse(null, null);
            asyncResult.AsyncWaitHandle.WaitOne();

            string response;
            using (WebResponse webResponse = webRequest.EndGetResponse(asyncResult))
            {
                using (StreamReader rd = new StreamReader(webResponse.GetResponseStream()))
                {
                    response = rd.ReadToEnd();
                }
            }

            int startPos = response.IndexOf("<return>");
            int lastPos = response.LastIndexOf("</return>") - startPos + 9;
            string responseFormatted = response.Substring(startPos, lastPos);

            XmlSerializer serializer = new XmlSerializer(typeof(EoriResponseModel));
            EoriResponseModel result; 

            using (TextReader reader = new StringReader(responseFormatted))
            {
                result = (EoriResponseModel)serializer.Deserialize(reader);
            }

            return result;
        }

        private static HttpWebRequest CreateWebRequest(string url)
        {
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
            webRequest.ContentType = "text/xml;charset=\"utf-8\"";
            webRequest.Accept = "text/xml";
            webRequest.Method = "POST";
            return webRequest;
        }

        private static XmlDocument CreateSoapEnvelope(string number)
        {
            XmlDocument soapEnvelopeDocument = new XmlDocument();
            StringBuilder xmlBuilder = new StringBuilder();
            xmlBuilder.AppendFormat("<soap:Envelope xmlns:soap={0} >", "'http://schemas.xmlsoap.org/soap/envelope/'");
            xmlBuilder.Append("<soap:Body>");
            xmlBuilder.AppendFormat("<ev:validateEORI xmlns:ev={0} >", "'http://eori.ws.eos.dds.s/'");
            xmlBuilder.AppendFormat("<ev:eori>{0}</ev:eori>", number);
            xmlBuilder.Append("</ev:validateEORI>");
            xmlBuilder.Append("</soap:Body> ");
            xmlBuilder.Append("</soap:Envelope> ");

            soapEnvelopeDocument.LoadXml(xmlBuilder.ToString());
            return soapEnvelopeDocument;
        }

        private static void InsertSoapEnvelopeIntoWebRequest(XmlDocument soapEnvelopeXml, HttpWebRequest webRequest)
        {
            using (Stream stream = webRequest.GetRequestStream())
            {
                soapEnvelopeXml.Save(stream);
            }
        }
    }

以及用于解析结果的带有注解的类

[XmlRoot(ElementName = "return")]
    public class EoriResponseModel
    {
        [XmlElement(ElementName = "requestDate")]
        public string RequestDate { get; set; }
        [XmlElement(ElementName = "result")]
        public List<Result> Result { get; set; }
    }

    [XmlRoot(ElementName = "result")]
    public class Result
    {
        [XmlElement(ElementName = "eori")]
        public string Eori { get; set; }
        [XmlElement(ElementName = "status")]
        public string Status { get; set; }
        [XmlElement(ElementName = "statusDescr")]
        public string StatusDescr { get; set; }
        [XmlElement(ElementName = "name")]
        public string Name { get; set; }
        [XmlElement(ElementName = "street")]
        public string Street { get; set; }
        [XmlElement(ElementName = "postalCode")]
        public string PostalCode { get; set; }
        [XmlElement(ElementName = "city")]
        public string City { get; set; }
        [XmlElement(ElementName = "country")]
        public string Country { get; set; }
    }

Answer 2

如果您在打开 EORI 验证方法的定义时打开的 Reference.cs 文件深处的 URI 进行谷歌搜索，那么您会发现此页面上的某个人 https://www.codeproject.com/Questions/1075553/Soap-Message-Format-Issue-while-accessing-webservi 遇到了同样的问题。

在那个页面上，他引用了他用来进行查询的示例代码。

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> 
 <soap:Body> 
<ev:validateEORI xmlns:ev="http://eori.ws.eos.dds.s/"> 
<ev:eori>DE123456</ev:eori> 
<ev:eori>IT123456789</ev:eori> 
</ev:validateEORI> 
</soap:Body> 
</soap:Envelope> 

在 Postman 中尝试此代码，并享受结果。 :D

他的疑问最终是他编写的 C# 代码没有创建有效的 XML，但至少该 XML 会从 API 中为您获取结果，以便您的测试/开发过程继续进行。