C# Deserialization of xml file returns "'There is an error in XML document (1, 2).'" error

Question

I'm trying to deserialize an xml response I get from a call. I've used Visual Studios "Paste Special" function to prepare my program for how the file is gonna look, and the only change I've made to the result of this is changing a field from private to public, so that I can access it in my code. (This is done outside of the snippet of code, just want to clarify that I've not made any changes in the code snippet)

The error

System.InvalidOperationException: 'There is an error in XML document (1, 2).'
Inner Exception
InvalidOperationException: <Envelope xmlns='http://schemas.xmlsoap.org/soap/envelope/'> was not expected.

Start of my class

[System.SerializableAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true, Namespace = "http://schemas.xmlsoap.org/soap/envelope/")]
[System.Xml.Serialization.XmlRootAttribute(Namespace = "http://schemas.xmlsoap.org/soap/envelope/", IsNullable = false)]
public partial class Envelope
{

    private object headerField;

    private EnvelopeBody bodyField;

    /// <remarks/>
    public object Header
    {
        get
        {
            return this.headerField;
        }
        set
        {
            this.headerField = value;
        }
    }

    /// <remarks/>
    public EnvelopeBody Body
    {
        get
        {
            return this.bodyField;
        }
        set
        {
            this.bodyField = value;
        }
    }
}

Start of my XML

<SOAP:Envelope xmlns:SOAP='http://schemas.xmlsoap.org/soap/envelope/'>
    <SOAP:Header/>
    <SOAP:Body xmlns:wsu='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd' xmlns:urn='urn:oio:medarbejder:1.0.0' xmlns:urn1='urn:oio:sagdok:3.0.0'>
        <ns0:ListOutput xmlns:ns0='urn:oio:medarbejder:1.0.0'>
            <ns1:StandardRetur xmlns:ns1='urn:oio:sagdok:3.0.0'>
                <ns1:StatusKode>0</ns1:StatusKode>
            </ns1:StandardRetur>
            <ns0:LaesResultat>
                <ns1:MedarbejderRef xmlns:ns1='urn:oio:sagdok:3.0.0'>
                    <ns1:UUIDIdentifikator/>
                    <ns1:URNIdentifikator>URN:OIO:KMD:LPE:MEDARBEJDERNR:00000001</ns1:URNIdentifikator>
                </ns1:MedarbejderRef>
                <ns0:Registrering>
                    <ns0:AttributListe>
                        <ns0:Egenskaber>
                            <ns0:Persondata>
                                <ns0:Gyldighedsstart>1970-12-12</ns0:Gyldighedsstart>
                                <ns0:Gyldighedsstop>2099-01-01</ns0:Gyldighedsstop>
                                <ns0:CPR-nummer>1234567890</ns0:CPR-nummer>
                                <ns0:Efternavn>Doe</ns0:Efternavn>
                                <ns0:Fornavn>John</ns0:Fornavn>
                                <ns0:PersonaleIdentifikator>01</ns0:PersonaleIdentifikator>
                            </ns0:Persondata>
                            <ns0:Persondata>
                                <ns0:Gyldighedsstart>2099-01-01</ns0:Gyldighedsstart>
                                <ns0:Gyldighedsstop>9999-12-31</ns0:Gyldighedsstop>
                                <ns0:CPR-nummer>1234567890</ns0:CPR-nummer>
                                <ns0:Efternavn>Doe</ns0:Efternavn>
                                <ns0:Fornavn>John</ns0:Fornavn>
                                <ns0:PersonaleIdentifikator>01</ns0:PersonaleIdentifikator>
                            </ns0:Persondata>
                        </ns0:Egenskaber>
                    </ns0:AttributListe>
                    <ns0:RelationListe/>
                </ns0:Registrering>
            </ns0:LaesResultat>
            <ns0:LaesResultat>
                <ns1:MedarbejderRef xmlns:ns1='urn:oio:sagdok:3.0.0'>
                    <ns1:UUIDIdentifikator/>
                    <ns1:URNIdentifikator>URN:OIO:KMD:LPE:MEDARBEJDERNR:00000002</ns1:URNIdentifikator>
                </ns1:MedarbejderRef>
                <ns0:Registrering>
                    <ns0:AttributListe>
                        <ns0:Egenskaber>
                            <ns0:Persondata>
                                <ns0:Gyldighedsstart>1970-12-12</ns0:Gyldighedsstart>
                                <ns0:Gyldighedsstop>2099-01-01</ns0:Gyldighedsstop>
                                <ns0:CPR-nummer>0987654321</ns0:CPR-nummer>
                                <ns0:Efternavn>Doe</ns0:Efternavn>
                                <ns0:Fornavn>Jane</ns0:Fornavn>
                                <ns0:PersonaleIdentifikator>01</ns0:PersonaleIdentifikator>
                            </ns0:Persondata>
                        </ns0:Egenskaber>
                    </ns0:AttributListe>
                    <ns0:RelationListe/>
                </ns0:Registrering>
            </ns0:LaesResultat>
        </ns0:ListOutput>
    </SOAP:Body>
</SOAP:Envelope>

The only thing I could think of that might fix it, is adding an "ElementName" to

[System.Xml.Serialization.XmlRootAttribute

But tried it, and it gave same error.

What am I missing ?

did you check the XML file in the XML validator? I doubt, your XML is not valid. — Muhammad Bashir
– Muhammad Bashir, Commented Feb 22, 2023 at 9:59
every XML has a closing tag (or call it node), in the snapshot, it appears, some closing nodes/tags are missing. — Muhammad Bashir
– Muhammad Bashir, Commented Feb 22, 2023 at 10:00
Exception InvalidOperationException: was not expected. -- looks like you've got an invisible character at the start. Open it in a hex editor, see what the first few characters are? — canton7
– canton7, Commented Feb 22, 2023 at 10:02
@canton7 Not sure why it removed the text there oO It's supposed to say "InvalidOperationException: <Envelope xmlns='schemas.xmlsoap.org/soap/envelope'> was not expected." I'll update the question :) — Kiesp
– Kiesp, Commented Feb 22, 2023 at 10:11
My go-to trick for debugging XmlSerializer deserialization is to take your model and serialize it to XML. See how the output differs from the thing you're trying to deserialize, then tweak your model until they match. Then deserialization should work — canton7
– canton7, Commented Feb 22, 2023 at 10:13

Kiesp · Accepted Answer · 2023-02-22 12:02:54Z

0

Turns out it was because I was trying to deserialize my EnvelopeBody rather than the Envelope. Between the naming in the xml file and the naming in the autogenerated classes, I simply mixed the two of them up, because they were so similar.

Deserialization should always start at the root element

answered Feb 22, 2023 at 12:02

Kiesp

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