Deserializing XML from String

Question

I'm trying to convert the result I get from my web service as a string and convert it to an object.

This is the string I'm getting from my service:

<StatusDocumentItem><DataUrl/><LastUpdated>2013-01-31T15:28:13.2847259Z</LastUpdated><Message>The processing of this task has started</Message><State>1</State><StateName>Started</StateName></StatusDocumentItem>

So I have a class for this as:

[XmlRoot]
public class StatusDocumentItem
{
    [XmlElement]
    public string DataUrl;
    [XmlElement]
    public string LastUpdated;
    [XmlElement]
    public string Message;
    [XmlElement]
    public int State;
    [XmlElement]
    public string StateName;
}

And this is how I'm trying to get that string as an object of type StatusDocumentItem with XMLDeserializer (NB. operationXML contains the string):

string operationXML = webRequest.getJSON(args[1], args[2], pollURL);
var serializer = new XmlSerializer(typeof(StatusDocumentItem));
StatusDocumentItem result;

using (TextReader reader = new StringReader(operationXML))
{
    result = (StatusDocumentItem)serializer.Deserialize(reader);
}

Console.WriteLine(result.Message);

But my result object is always empty. What am I doing wrong?

Update. The value I get from my operationXML is like this and has an unnecessary xmlns attribute that is blocking my deserialization. Without that attribute, everything is working fine. Here is how it looks like:

"<StatusDocumentItem xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"><DataUrl/><LastUpdated>2013-02-01T12:35:29.9517061Z</LastUpdated><Message>Job put in queue</Message><State>0</State><StateName>Waiting to be processed</StateName></StatusDocumentItem>"

"operationXML contains the string" - does it? Have you actually checked with, say, a debugger? "getJSON" to retrieve XML looks fishy. — Christian.K
– Christian.K, Commented Feb 1, 2013 at 12:10
If you set your xml example to operationXML. The deserialization works perfectly well. — Cédric Bignon
– Cédric Bignon, Commented Feb 1, 2013 at 12:12
Yes it does contain the string, here's what I get from debugger: "<StatusDocumentItem xmlns:i=\"w3.org/2001/XMLSchema-instance\"><DataUrl/><LastUpdated>2013-02-01T12:13:02.0997071Z</LastUpdated><Message>The processing of this task has started</Message><State>1</State><StateName>Started</StateName></StatusDocumentItem>" — disasterkid
– disasterkid, Commented Feb 1, 2013 at 12:14
@Pedram string operationXML = "<StatusDocumentItem><DataUrl/><LastUpdated>2013-01-31T15:28:13.2847259Z</LastUpdated><Message>The processing of this task has started</Message><State>1</State><StateName>Started</StateName></StatusDocumentItem>"; — Cédric Bignon
– Cédric Bignon, Commented Feb 1, 2013 at 12:16

Cédric Bignon · Accepted Answer · 2013-02-01 12:45:26Z

142

Try this:

string xml = "<StatusDocumentItem xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"><DataUrl/><LastUpdated>2013-02-01T12:35:29.9517061Z</LastUpdated><Message>Job put in queue</Message><State>0</State><StateName>Waiting to be processed</StateName></StatusDocumentItem>";
var serializer = new XmlSerializer(typeof(StatusDocumentItem));
StatusDocumentItem result;

using (TextReader reader = new StringReader(xml))
{
    result = (StatusDocumentItem)serializer.Deserialize(reader);
}

Console.WriteLine(result.Message);
Console.ReadKey();

Does it show "Job put in queue"?

answered Feb 1, 2013 at 12:45

Cédric Bignon

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CRG · Accepted Answer · 2021-10-14 03:22:15Z

16

This generic extension works well for me....

public static class XmlHelper
{
    public static T FromXml<T>(this string value)
    {
        using TextReader reader = new StringReader(value);
        return (T) new XmlSerializer(typeof(T)).Deserialize(reader);
    }
}

answered Oct 14, 2021 at 3:22

CRG

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1 Comment

Pedro Martín Over a year ago

The best way to do it, imo

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