FaultException<> Detail returns null

Question

I am having some trouble getting back the Detail from a custom Fault Exception within a C# program. When I execute the same call in Postman, I get the response fine, but when trying to do the same thing in c#, the detail all returns null.

My code in c#:

        try
        {
            Client.Open();
            var response = Client.findPerson(req);
            Client.Close();
        }            
        catch (FaultException<MIAPAPIException> e)
        {

            ErrorResponse error = new ErrorResponse
            {
                ErrorCode = e.Detail.ErrorCode,
                ErrorActor = e.Detail.ErrorActor,
                TimeStamp = e.Detail.ErrorTimestamp,
                ErrorDescription = e.Detail.Description
            };
        }

The MIAPAPIException Class in the wsdl is define like this:

[System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.8.4084.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(Namespace="http://generic.url/exceptions")]
public partial class MIAPAPIException : object, System.ComponentModel.INotifyPropertyChanged {
    
    private string errorCodeField;
    
    private string errorActorField;
    
    private string descriptionField;
    
    private string furtherDetailsField;
    
    private string errorTimestampField;
    
    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=0)]
    public string ErrorCode {
        get {
            return this.errorCodeField;
        }
        set {
            this.errorCodeField = value;
            this.RaisePropertyChanged("ErrorCode");
        }
    }
    
    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=1)]
    public string ErrorActor {
        get {
            return this.errorActorField;
        }
        set {
            this.errorActorField = value;
            this.RaisePropertyChanged("ErrorActor");
        }
    }
    
    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=2)]
    public string Description {
        get {
            return this.descriptionField;
        }
        set {
            this.descriptionField = value;
            this.RaisePropertyChanged("Description");
        }
    }
    
    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=3)]
    public string FurtherDetails {
        get {
            return this.furtherDetailsField;
        }
        set {
            this.furtherDetailsField = value;
            this.RaisePropertyChanged("FurtherDetails");
        }
    }
    
    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=4)]
    public string ErrorTimestamp {
        get {
            return this.errorTimestampField;
        }
        set {
            this.errorTimestampField = value;
            this.RaisePropertyChanged("ErrorTimestamp");
        }
    }
    
    public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;
    
    protected void RaisePropertyChanged(string propertyName) {
        System.ComponentModel.PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
        if ((propertyChanged != null)) {
            propertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
        }
    }
}

Which I can't see any issues with.

The response that I get in postman if i do the same request that i'm doing in c#:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
    <soapenv:Fault>
        <faultcode>soapenv:Server</faultcode>
        <faultstring>exceptions.MIAPAPIException</faultstring>
        <detail>
            <ns10:MIAPAPIException xmlns:ns10="http://generic.url/exceptions">
                <ErrorCode>CODE</ErrorCode>
                <ErrorActor>MSGValidator.validateSOAPMSG()</ErrorActor>
                <Description>DESC</Description>
                <FurtherDetails>DETAILS</FurtherDetails>
                <ErrorTimestamp>2022-10-11 14:34:16</ErrorTimestamp>
            </ns10:MIAPAPIException>
        </detail>
    </soapenv:Fault>
</soapenv:Body>
</soapenv:Envelope>

Im not sure what is causing this to be null when my code picks it up in c#. The ordering of the response in postman matches the ordering of the wsdl as well as the namespace matching in both.

I've tried updating the catch to be

catch (FaultException<MIAPAPIException[]> e)

But this doesn't catch the error at all. I thought this may be an array due to the <ns10:MIAPAPIException namespace at the start of the details but i appear to be incorrect here.

Answer 1

Replace .Close() with .Abort(). Abort should be used when the proxy is in a faulted state. You could try the below.

    if (client.State != CommunicationState.Faulted)
    {
        client.Close();
    }
    else
    {
        client.Abort();
    }

Answer 2

Try following :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
using System.Globalization;

namespace ConsoleApplication49
{

    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XmlReader reader = XmlReader.Create(FILENAME);
            XmlSerializer serializer = new XmlSerializer(typeof(Envelope));
            Envelope envelope = (Envelope)serializer.Deserialize(reader);

        }
    }
    [XmlRoot(Namespace = "http://schemas.xmlsoap.org/soap/envelope/")]
    public class Envelope
    {
        public Body Body { get; set; }
    }
    public class Body
    {
        public Fault Fault { get; set; }
    }
    public class Fault
    {
        [XmlElement(Namespace = "")]
        public string faultcode { get; set; }
        [XmlElement(Namespace = "")]
        public string faultstring { get; set; }
        [XmlArray(ElementName = "detail", Namespace = "")]
        [XmlArrayItem(ElementName = "MIAPAPIException", Namespace = "http://generic.url/exceptions")]
        public List<MIAPAPIException> MIAPAPIException { get; set; } 
    }
    public class MIAPAPIException
    {
        [XmlElement(Namespace = "")]
        public string ErrorCode { get; set; }
        [XmlElement(Namespace = "")]
        public string ErrorActor { get; set; }
        [XmlElement(Namespace = "")]
        public string Description { get; set; }
        [XmlElement(Namespace = "")]
        public string FurtherDetails { get; set; }

        DateTime _ErrorTimestamp { get; set; }
        [XmlElement(Namespace = "")]
        public string ErrorTimestamp { 
            get{ return  _ErrorTimestamp.ToString("yyyy-MM-dd HH:mm:ss");} 
            set{ _ErrorTimestamp = DateTime.ParseExact(value, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture) ;} 
        }
    }
}