c# parse string to xml using StringReader

Question

I have an XML and I load it in an class.

This is my XML

<out_policySystem xmlns:msl="http://www.ibm.com/xmlmap" xmlns:io="" xmlns:xs4xs="http://www.w3.org/2001/XMLSchema">
  <BGBAResultadoOperacion>
    <Severidad>OK</Severidad>
  </BGBAResultadoOperacion>
  <permiteOperar>true</permiteOperar>
  <Lista xmlns:ns0=\"http://CalypsoPolicySystem_lib/service\">
    <Codigo>ODM-006</Codigo>
    <Descripcion>Aviso</Descripcion>
    <DescripcionTecnica>XXXX</DescripcionTecnica>
  </Lista>
</out_policySystem>

I have define my classes like this.

    [XmlRoot(ElementName = "out_policySystem")]
    public partial class output_policySystem
    {
        public BGBAResultadoOperacion BGBAResultadoOperacion { get; set; }
        public bool permiteOperar { get; set; }
       public List[] Lista { get; set; }
    }
      public partial class BGBAResultadoOperacion
    {
        public string Severidad { get; set; }
    }
     public partial class List
    {
        public string Codigo { get; set; }
        public string Descripcion { get; set; }
        public string DescripcionTecnica { get; set; }
    }

I read this like this.

 XmlNodeList elemlist = xDoc.GetElementsByTagName("out_policySystem");
 string result = elemlist[0].InnerXml;
 XmlSerializer serializer = new XmlSerializer(typeof(BGBAResultadoOperacion));

 using (StringReader reader = new StringReader(result))
 {
 result = (BGBAResultadoOperacion)(serializer.Deserialize(reader));
 }

the value of result is this.

<BGBAResultadoOperacion><Severidad>OK</Severidad></BGBAResultadoOperacion><permiteOperar>true</permiteOperar><Lista><Codigo>ODM-006</Codigo><Descripcion>Aviso</Descripcion><DescripcionTecnica>xxxx</DescripcionTecnica></Lista>

What I need is to get the value of BGBAResultadoOperacion

when i set

using (StringReader reader = new StringReader(result))
     {
     result = (BGBAResultadoOperacion)(serializer.Deserialize(reader));
     }

result get XML error...

There are multiple root elements. Line 1, position 76.

XML node out_policySystem has three root elements inside it. I need to parse only BGBAResultadoOperacion

How can I get it?

Thanks

I add inner exception... it says There are multiple root elements. Line 1, position 76. thanks — Diego
– Diego, Commented Aug 27, 2018 at 18:35
You need to read the entire xml. The xml serialize needs a well formed xml file which means you can only have one root element. You are removing the element out_policySystem which is the cause of the error which then gives three elements at the root. — jdweng
– jdweng, Commented Aug 27, 2018 at 20:04

David Browne - Microsoft · Accepted Answer · 2018-08-27 18:44:59Z

1

That's because of this line:

elemlist[0].InnerXml

Which returns an XML Fragment, not an XML Document.

  <BGBAResultadoOperacion>
    <Severidad>OK</Severidad>
  </BGBAResultadoOperacion>
  <permiteOperar>true</permiteOperar>
  <Lista xmlns:ns0=\"http://CalypsoPolicySystem_lib/service\">
    <Codigo>ODM-006</Codigo>
    <Descripcion>Aviso</Descripcion>
    <DescripcionTecnica>XXXX</DescripcionTecnica>
  </Lista>

So either use the .OuterXML, or use XElement.CreateReader() as described in the answer here: Serialize an object to XElement and Deserialize it in memory

answered Aug 27, 2018 at 18:44

David Browne - Microsoft

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