Question

我正在使用WCF Service 4.5 F / W开发REST Full API。请建议如何向客户端发送异常或任何业务验证消息。我正在寻找非常通用的解决方案，请提出最佳方法。我在下面尝试了一些方法，

在向客户发送回复之前设置OutgoingWebResponseContext。
定义的故障合同只能正常工作添加服务引用（代理类）无法在REST FULL环境中工作。
在catch块中添加WebFaultException类。
WCF休息入门套件 - 我收到了一些关于此事的文章和帖子，但他们的codeplex官方建议不再提供此信息。 link。所以，我不想这样做。

这些没有按预期工作.. 我的示例代码段：接口：

    [OperationContract]
    [FaultContract(typeof(MyExceptionContainer))]
    [WebInvoke(Method = "GET", UriTemplate = "/Multiply/{num1}/{num2}", BodyStyle = WebMessageBodyStyle.Wrapped,RequestFormat = WebMessageFormat.Xml, ResponseFormat = WebMessageFormat.Xml)]
    string Multiply(string num1, string num2);

实现：

         public string Multiply(string num1, string num2)
    {
        if (num1 == "0" || num2 == "0")
        {
            try
            {
                MyExceptionContainer exceptionDetails = new MyExceptionContainer();
                exceptionDetails.Messsage = "Business Rule violatuion";
                exceptionDetails.Description = "The numbers should be non zero to perform this operation";
                //OutgoingWebResponseContext outgoingWebResponseContext = WebOperationContext.Current.OutgoingResponse;
                //outgoingWebResponseContext.StatusCode = System.Net.HttpStatusCode.ExpectationFailed;
                //outgoingWebResponseContext.StatusDescription = exceptionDetails.Description.ToString();
               // throw new WebFaultException<MyExceptionContainer>(exceptionDetails,System.Net.HttpStatusCode.Gone);
                throw new FaultException<MyExceptionContainer>(exceptionDetails,new FaultReason("FaultReason is " + exceptionDetails.Messsage + " - " + exceptionDetails.Description));
            }
            catch (Exception ex)
            {
                throw new FaultException(ex.Message);
            }
        }

        return Convert.ToString(Int32.Parse(num1) * Int32.Parse(num2));
    }

Web.Config：

  <system.serviceModel>
<services>
  <service name="TestService.TestServiceImplementation" behaviorConfiguration="ServiceBehaviour">
    <endpoint binding="webHttpBinding" contract="TestService.ITestService" behaviorConfiguration="webHttp" >
    </endpoint>
  </service>
</services>
<behaviors>
  <serviceBehaviors>
    <behavior name="ServiceBehaviour">
      <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
      <serviceMetadata httpGetEnabled="true"/>
      <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
      <serviceDebug includeExceptionDetailInFaults="true"/>
    </behavior>
  </serviceBehaviors>
  <endpointBehaviors>
    <behavior name="webHttp" >
      <webHttp helpEnabled="true" faultExceptionEnabled="true"/>
    </behavior>
  </endpointBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />

客户：

try
        {
            string serviceUrl = "http://localhost:51775/TestService.cs.svc/Multiply/0/0";
            //Web Client
            //WebClient webClient = new WebClient();
            //string responseString = webClient.DownloadString(serviceUrl);
            WebRequest req = WebRequest.Create(serviceUrl);
            req.Method = "GET";
            req.ContentType = @"application/xml; charset=utf-8";
            HttpWebResponse resp = req.GetResponse() as HttpWebResponse;
            if (resp.StatusCode == HttpStatusCode.OK)
            {
                XmlDocument myXMLDocument = new XmlDocument();
                XmlReader myXMLReader = new XmlTextReader(resp.GetResponseStream());
                myXMLDocument.Load(myXMLReader);
                Console.WriteLine(myXMLDocument.InnerText);
            }
            Console.ReadKey();
        }
        catch (Exception ex)
        { 
        Console.WriteLine(ex.Message);
        }

这是我的第一个问题，感谢所有充满激情的开发者......！

Answer 1

使用以下内容代替FaultException：

服务器

catch (Exception ex) { throw new System.ServiceModel.Web.WebFaultException<string>(ex.ToString(), System.Net.HttpStatusCode.BadRequest); }

客户：

catch (Exception ex) { var protocolException = ex as ProtocolException; var webException = protocolException.InnerException as WebException; if (protocolException != null && webException != null) { var responseStream = webException.Response.GetResponseStream(); var error = new StreamReader(webException.Response.GetResponseStream()).ReadToEnd(); throw new Exception(error); } else throw new Exception("There is an unexpected error with reading the stream.", ex); }

Answer 2

在wcf中创建真正的休息几乎是不可能的，但是利用httpprotocol的部分内容当然是可能的。

要控制服务中的错误消息，您必须提供一个错误处理程序（I错误处理程序实现），该处理程序挂钩到wcf堆栈并覆盖此处定义的任何错误处理。

此界面包含两种方法。一个通知wcf它是否可以处理某个异常（bool HandleError），另一个通知如果HandleError返回true。第二种方法ProvideFault允许您定义在异常情况下如何响应客户端。

您可以链接处理程序以获得更多粒度。由于您正在休息，您应该使用httpstatus代码来告知适用的错误情况。

http://blogs.msdn.com/b/carlosfigueira/archive/2011/06/07/wcf-extensibility-ierrorhandler.aspx

http://www.remondo.net/wcf-global-exception-handling-attribute-and-ierrorhandler/

Answer 3

Web.Config：

<system.serviceModel>
   <services>
    <service name="TestService.TestServiceImplementation">
      <endpoint address=""
                binding="webHttpBinding"
                contract="TestService.Service.ITestServiceImplementation" />
    <service/>
  <services/>
    <behaviors>
      <serviceBehaviors>
        <behavior>         
          <serviceMetadata httpGetEnabled="true"/>         
          <serviceDebug includeExceptionDetailInFaults="true"/>
        <behavior/>
      <serviceBehaviors/>
    <behaviors/>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  <system.serviceModel/>
 <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>   
    <directoryBrowse enabled="true"/>
  <system.webServer/>

实施方式：

 public string Multiply(string num1, string num2)
{
    if (num1 == "0" || num2 == "0")
    {
        try
        {
            MyExceptionContainer exceptionDetails = new MyExceptionContainer();
            exceptionDetails.Messsage = "Business Rule violatuion";
            exceptionDetails.Description = "The numbers should be non zero to perform this operation";
            //OutgoingWebResponseContext outgoingWebResponseContext = WebOperationContext.Current.OutgoingResponse;
            //outgoingWebResponseContext.StatusCode = System.Net.HttpStatusCode.ExpectationFailed;
            //outgoingWebResponseContext.StatusDescription = exceptionDetails.Description.ToString();
           // throw new WebFaultException<MyExceptionContainer>(exceptionDetails,System.Net.HttpStatusCode.Gone);
            throw new FaultException<MyExceptionContainer>(exceptionDetails,new FaultReason("FaultReason is " + exceptionDetails.Messsage + " - " + exceptionDetails.Description));
        }
        catch (FaultException ex)
        {
            throw new FaultException(ex.Message);
        }
    }

    return Convert.ToString(Int32.Parse(num1) * Int32.Parse(num2));
}

WCF RESTFul服务中的异常处理

3 个答案: