Question

我是ASP.Net Web API的新手。我正在尝试与基于Recurly REST的API进行交互，并且在我的ReadAsAsync调用期间遇到如下错误，我认为它会尝试序列化响应。

{"Error in line 1 position 73. Expecting element 'account' from namespace 'http://schemas.datacontract.org/2004/07/RecurlyWebApi.Recurly'.. Encountered 'Element'  with name 'account', namespace ''. "}

这是我的HttpClient实现，为简洁而简化：

  public class RecurlyClient
  {
    readonly HttpClient client = new HttpClient();

    public RecurlyClient()
    {
      var config = (RecurlySection)ConfigurationManager.GetSection("recurly");

      client.BaseAddress = new Uri(string.Format("https://{0}.recurly.com/v2/", config.Subdomain));

      // Add the authentication header
      client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes(config.ApiKey)));

      // Add an Accept header for XML format.
      client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml"));
    }

    public T Get<T>(string id)
    {
      var accounts = default(T);

      // Make the request and get the response from the service
      HttpResponseMessage response = client.GetAsync(string.Concat("accounts/", id)).Result;  // Blocking call!

      if (response.IsSuccessStatusCode)
      {
        // Parse the response body. Blocking!
        accounts = response.Content.ReadAsAsync<T>().Result;
      }

      return accounts;
    }
  }

这是我的模特：

  [XmlRoot("account")]
  public class Account
  {
    [XmlAttribute("href")]
    public string Href { get; set; }

    [XmlElement("account_code")]
    public string AccountCode { get; set; }

    [XmlElement("state")]
    public AccountState State { get; set; }

    [XmlElement("username")]
    public string Username { get; set; }

    [XmlElement("email")]
    public string Email { get; set; }

    [XmlElement("first_name")]
    public string FirstName { get; set; }

    [XmlElement("last_name")]
    public string LastName { get; set; }

    [XmlElement("company_name")]
    public string Company { get; set; }

    [XmlElement("accept_language")]
    public string LanguageCode { get; set; }

    [XmlElement("hosted_login_token")]
    public string HostedLoginToken { get; set; }

    [XmlElement("created_at")]
    public DateTime CreatedDate { get; set; }

    [XmlElement("address")]
    public Address Address { get; set; }
  }

该服务的XML响应示例：

<account href="https://mysubdomain.recurly.com/v2/accounts/SDTEST01">
  <adjustments href="https://mysubdomain.recurly.com/v2/accounts/SDTEST01/adjustments"/>
  <invoices href="https://mysubdomain.recurly.com/v2/accounts/SDTEST01/invoices"/>
  <subscriptions href="https://mysubdomain.recurly.com/v2/accounts/SDTEST01/subscriptions"/>
  <transactions href="https://mysubdomain.recurly.com/v2/accounts/SDTEST01/transactions"/>
  <account_code>SDTEST01</account_code>
  <state>active</state>
  <username>myusername</username>
  <email>simon@example.co.uk</email>
  <first_name>First name</first_name>
  <last_name>Last name</last_name>
  <company_name>My Company Name</company_name>
  <vat_number nil="nil"></vat_number>
  <address>
    <address1>My Address Line 1/address1>
    <address2>My Address Line 2</address2>
    <city>My City</city>
    <state>My State</state>
    <zip>PL7 1AB</zip>
    <country>GB</country>
    <phone>0123456789</phone>
  </address>
  <accept_language nil="nil"></accept_language>
  <hosted_login_token>***</hosted_login_token>
  <created_at type="datetime">2013-08-22T15:58:17Z</created_at>
</account>

Answer 1

我认为问题是因为默认情况下DataContractSerializer用于反序列化XML，默认情况下DataContractSerializer使用命名空间http://schemas.datacontract.org/2004/07/Clr.Namespace的命名空间。（在这种情况下，Clr.Namepace是RecurlyWebApi.Recurly。）

因为您的XML具有属性，所以您需要使用XmlSerializer而不是DataContractSerializer，并且您已设置为执行此操作，因为您的帐户类使用Xml *属性进行修饰。但是，您必须使用正在使用XmlSerializer的XmlMediaTypeFormatter。您可以通过在this page：

上描述的全局XMLFormatter上设置标志来完成此操作

var xml = GlobalConfiguration.Configuration.Formatters.XmlFormatter;
xml.UseXmlSerializer = true;

或通过提供MediaTypeFormatter作为ReadAsAsync调用的参数：

var xmlFormatter = GlobalConfiguration.Configuration.Formatters.XmlFormatter;
xmlFormatter.UseXmlSerializer = true;
accounts = response.ReadAsAsync<T>(xmlFormatter).Result

不是100％肯定这一点，因为这并不能解释为什么错误消息中的第一个“帐户”是小写的 - DataContractSerializer应该忽略XmlRoot属性。

使用返回XML的Recurly Rest API时出现WebAPI序列化问题

1 个答案: