Unable to read FaultException from an asp.net core connected service - wcf

Question

I'm trying to catch the FaultException on a WCF client.
the generated reference contract is:
[System.ServiceModel.OperationContractAttribute(Action="urn:wcfname#method", ReplyAction="*")]
[System.ServiceModel.FaultContractAttribute(typeof(Error[]), Action= "urn:wcfname#method", Name="errors")]
[System.ServiceModel.XmlSerializerFormatAttribute(SupportFaults=true)]
[System.ServiceModel.ServiceKnownTypeAttribute(typeof(Response))]
[System.ServiceModel.ServiceKnownTypeAttribute(typeof(Request))]
service.response method(service.request request);
and the generated error class is:
[System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Tools.ServiceModel.Svcutil", "2.0.2")]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.Xml.Serialization.XmlTypeAttribute(Namespace="wcf")]
public partial class Error
{
private string errorCodeField;
private string errorStringField;
private string subErrorCodeField;
private string offendingFieldField;
private System.DateTime timeStampField;
private bool timeStampFieldSpecified;
private string detailStringField;
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(DataType="integer", Order=0)]
public string errorCode
{
get
{
return this.errorCodeField;
}
set
{
this.errorCodeField = value;
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(Order=1)]
public string errorString
{
get
{
return this.errorStringField;
}
set
{
this.errorStringField = value;
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(DataType="integer", Order=2)]
public string subErrorCode
{
get
{
return this.subErrorCodeField;
}
set
{
this.subErrorCodeField = value;
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(Order=3)]
public string offendingField
{
get
{
return this.offendingFieldField;
}
set
{
this.offendingFieldField = value;
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(Order=4)]
public System.DateTime timeStamp
{
get
{
return this.timeStampField;
}
set
{
this.timeStampField = value;
}
}
/// <remarks/>
[System.Xml.Serialization.XmlIgnoreAttribute()]
public bool timeStampSpecified
{
get
{
return this.timeStampFieldSpecified;
}
set
{
this.timeStampFieldSpecified = value;
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(Order=5)]
public string detailString
{
get
{
return this.detailStringField;
}
set
{
this.detailStringField = value;
}
}
}
the code to call the sercie is below:
try
{
//call the service method
}
catch (FaultException<Error[]> ex)
{
var errorElement = XElement.Parse(ex.CreateMessageFault().GetReaderAtDetailContents().ReadOuterXml());
var xmlDetail = (string)errorElement;
}
catch (FaultException ex)
{
var errorElement = XElement.Parse(ex.CreateMessageFault().GetReaderAtDetailContents().ReadOuterXml());
var xmlDetail = (string)errorElement;
}
When theres a FaultExeption<Error[]> ex, it enters there, but the error is empty string.
If I comment that part, it enters on the FaultException ex, but again the error is empty string.
I'm using .netCore 3.1
Any advice is appreciated.

Answer 1

Throwing FaultException indicates that there is no problem with the channel. The exception was thrown by the service. WCF's FaultException message is too general to pinpoint a specific problem, so you can customize the exception message like this:
public class HomeService : IHomeService
{
public Student Get(string id)
{
try
{
//Here, of course, an exception will be thrown
var result = Convert.ToInt32(id) / Convert.ToInt32("0");
return new Student() { ID = Convert.ToInt32(id), Name = "hxc", SNS = "001" };
}
catch (Exception ex)
{
var reason = new FaultReason("Exception thrown information");
var code = new FaultCode("500");
var faultException = new FaultException(reason, code, "It is GET that throws the exception");
throw faultException;
}
}
}