CustomError class RSS

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  PraveenAmar

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  CustomError class

  Aug 09, 2019 02:50 PM|PraveenAmar|LINK

  Hi,

   I need to create a CustomError class & send a list to the client How do i approach?

  I tried to follow this tutorial but couldn't figure out how to send a list

  https://www.tutorialsteacher.com/csharp/custom-exception-csharp

  Thanks,

  Praveen

• • Reply
  PatriceSc

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  Re: CustomError class

  Aug 09, 2019 03:56 PM|PatriceSc|LINK

  Hi,

  Some more context could help. You have an existing service of which kind ? This is to report errors on submitted data ?

  If possible you could model your approach based rather on https://docs.microsoft.com/en-us/aspnet/web-api/overview/formats-and-model-binding/model-validation-in-aspnet-web-api ie if you return a https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400 status code to tell the request sends invalid data all along with a json payload describing the errors.

• • Reply
  PraveenAmar

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  36 Points

  125 Posts

  Re: CustomError class

  Aug 09, 2019 04:41 PM|PraveenAmar|LINK

  It's a WCF service & i am trying to create a CustomException. Yes it is to report errors on the submitted data from a web page & need to throw an exception when a particular condition meets.

  I created a serializable class & inherited Exception class, in the constructor i passed error message that need to be displayed. Along with that i also need to  send  List back to UI & i am trying to figure that out

• • Reply
  mgebhard

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  Re: CustomError class

  Aug 09, 2019 05:06 PM|mgebhard|LINK

  The common approach is returning a custom soap exception.  The official WCF documentation covers the details.

  https://docs.microsoft.com/en-us/dotnet/framework/wcf/sending-and-receiving-faults

  https://docs.microsoft.com/en-us/dotnet/framework/wcf/specifying-and-handling-faults-in-contracts-and-services

• • Reply
  Abraham Qian

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  740 Points

  321 Posts

  Re: CustomError class

  Aug 27, 2019 09:04 AM|Abraham Qian|LINK

  Hi,
  If we just want to capture the server custom errors on the client-side, we could use FaultException class.

  Server-side.

  public string Test(string name)
  {
  if (name.Length<2)
  {
  FaultReasonText text = new FaultReasonText("name string length should greater than two ");
  FaultReason fr = new FaultReason(text);
  throw new FaultException(fr);
  }
  return DateTime.Now.ToString();
  }

  
  
  Client-side.

  ServiceReference1.ServiceClient client = new ServiceReference1.ServiceClient();
  try
  {
  var result = client.Test("A");
  Console.WriteLine(result);
  }
  catch (FaultException e)
  {
  Console.WriteLine(e.Reason.GetMatchingTranslation().Text);
  }

  
  We could also use the custom class.
  Server-side(Console application).

  class Program
  {
  static void Main(string[] args)
  {
  using (ServiceHost sh = new ServiceHost(typeof(MyService)))
  {
  sh.Open();
  Console.WriteLine("serivce is ready....");
  Console.ReadLine();
  sh.Close();
  }
  }
  }
  [ServiceContract]
  public interface IService
  {
  [OperationContract]
  [FaultContract(typeof(ErrorDetail))]
  void Test(string username,string password,string password2,int age);
  
  }
  public class MyService : IService
  {
  
  public void Test(string username,string password,string password2,int age)
  {
  ErrorDetail detail = new ErrorDetail();
  if (username.Length<2)
  {
  detail.UserNameFaultInfo = "\nusername string length should greater than 2";
  }
  if (password.Length<6)
  {
  detail.PasswordFaultInfo = "\npassword string length should greater than 2";
  }
  if (password2!=password)
  {
  detail.PasswordFaultInfo += "\npassword is not matched";
  }
  if (age<0||age>120)
  {
  detail.AgeFaultInfo = "\nage is not valid";
  }
  if (detail.UserNameFaultInfo!=null||detail.PasswordFaultInfo!=null||detail.AgeFaultInfo!=null)
  {
  throw new FaultException<ErrorDetail>(detail, "there is something wrong with the input information");
  }
  }
  }
  [DataContract]
  public class ErrorDetail
  {
  [DataMember]
  public string UserNameFaultInfo { get; set; } = null;
  [DataMember]
  public string PasswordFaultInfo { get; set; } = null;
  [DataMember]
  public string AgeFaultInfo { get; set; } = null;
  }

  
  App.config

  <system.serviceModel>
  <services>
  <service name="VM1.MyService">
  <endpoint address="" binding="basicHttpBinding" contract="VM1.IService" >
  </endpoint>
  <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" ></endpoint>
  <host>
  <baseAddresses>
  <add baseAddress="http://localhost:5566"/>
  </baseAddresses>
  </host>
  </service>
  </services>
  <behaviors>
  <serviceBehaviors>
  <behavior>
  <serviceMetadata httpGetEnabled="true"/>
  <serviceDebug includeExceptionDetailInFaults="true"/>
  </behavior>
  </serviceBehaviors>
  </behaviors>
  </system.serviceModel>

  
  Client(Console application) call by adding service reference.

  ServiceReference1.ServiceClient client = new ServiceReference1.ServiceClient();
  try
  {
  client.Test("a", "124", "234", 134);
  }
  catch (FaultException<ErrorDetail> e)
  {
  Console.WriteLine(e.Reason.GetMatchingTranslation().Text);
  ErrorDetail ed = e.Detail;
  StringBuilder sb = new StringBuilder();
  sb.Append(ed.UserNameFaultInfo);
  sb.Append(ed.PasswordFaultInfo);
  sb.Append(ed.AgeFaultInfo);
  Console.WriteLine(sb.ToString());
  }

  Result.

  

  Feel free to let me know if there is anything I can help with.

  Best Regards

  Abraham

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