How to get Soap Fault details elements in ASP.NET Core app

Question

I try to cath a SOAP exception from ASMX Websirvice in my ASP.NET Core API.

The legacy ASMX Webservice throw a SOAP Exception like this:

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <soap:Body>
        <soap:Fault>
            <faultcode>soap:Client</faultcode>
            <faultstring>System.Web.Services.Protocols.SoapException: An order must be specified
   at legacyNamespace.Common.WebServiceBase.CheckUserPermissionsForProject(String projectId)
   at legacyNamespace.CustomerApp.Defect.Defect.AcceptDefect(AcceptDefectModel defect)</faultstring>
            <detail>
                <errorCode>400</errorCode>
                <message>An order must be specified</message>
            </detail>
        </soap:Fault>
    </soap:Body>
</soap:Envelope>

Now I'm trying to catch and process this exception in my ASP.NET Core 2.2 Web API:

try
{
   // call the asmx service
}
catch (FaultException ex)
{
   var fault = ex.CreateMessageFault();
   if (fault.HasDetail)
   {
      var faultDetails = fault.GetDetail<XmlElement>();
      var test = faultDetails.InnerText;
   }
   ...
}

And the test var contains only the errorCode "400" and nothing more. faultDetails ChildNodes are empty. If I try to call GetDetail<XmlNode>() than I got a serialization exception. How can I get all detail elements?

Answer 1

Ok, after a few tries, I found a simple solution. You just need to add an additional node into the detail node. And then you will get it as an XMLElement with ChildNodes.

Than you can get it out:

var faultDetails = fault.GetDetail<XmlElement>();
var errorCode = faultDetails.GetElementsByTagName("errorCode")[0]?.InnerText;
var message = faultDetails.GetElementsByTagName("message")[0]?.InnerText;