how to deserialize a xml to object?

Question

<?xml version="1.0" encoding="utf-8" standalone="no"?>

<package version="2.0" xmlns="http://www.idpf.org/2007/opf" unique-identifier="bookid">
<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
<dc:identifier id="bookid">easypub-ed863743</dc:identifier>
<dc:date>2019</dc:date>
<dc:language>zh-CN</dc:language>
<meta name="cover" content="cover-image"/>
</metadata>
</package>
</xml>

when I want to deserialize the xml it will give a error that package xmlns="http://www.idpf.org/2007/opf" is unexpected.

Answer 1

@mc , According my test, I reproduced your problem when I want to deserialize the xml to class object.

Based on my research, I find that we need to add namespace in the class define to solve the problem.

Here is a code example you could refer to.

Class code:

[XmlRoot(ElementName = "identifier")]  
	public class Identifier  
	{  
  
		[XmlAttribute(AttributeName = "id")]  
		public string Id { get; set; }  
  
		[XmlText]  
		public string Text { get; set; }  
	}  
  
	[XmlRoot(ElementName = "Meta")]  
	public class Meta  
	{  
  
		[XmlAttribute(AttributeName = "name")]  
		public string Name { get; set; }  
  
		[XmlAttribute(AttributeName = "content")]  
		public string Content { get; set; }  
	}  
  
	[XmlRoot(ElementName = "metadata")]  
	public class Metadata  
	{  
  
		[XmlElement(ElementName = "identifier",Namespace = "http://purl.org/dc/elements/1.1/")]  
		public Identifier Identifier { get; set; }  
  
		[XmlElement(ElementName = "date", Namespace = "http://purl.org/dc/elements/1.1/")]  
		public int Date { get; set; }  
  
		[XmlElement(ElementName = "language", Namespace = "http://purl.org/dc/elements/1.1/")]  
		public string Language { get; set; }  
  
		[XmlElement(ElementName = "meta")]  
		public Meta Meta { get; set; }  
	}  
  
	[XmlRoot(ElementName = "package",Namespace = "http://www.idpf.org/2007/opf")]  
	public class Package  
	{  
  
		[XmlElement(ElementName = "metadata")]  
		public Metadata Metadata { get; set; }  
  
		[XmlAttribute(AttributeName = "version")]  
		public double Version { get; set; }  
  
		[XmlAttribute(AttributeName = "unique-identifier")]  
		public string UniqueIdentifier { get; set; }  
  
	}  

How to deserialize the xml to class:

        XmlSerializer serializer = new XmlSerializer(typeof(Package));  
			string xml = File.ReadAllText("D:\\test.xml");  
        using (StringReader reader = new StringReader(xml))  
        {  
            var test = (Package)serializer.Deserialize(reader);  
        }  

Result:

Best Regards,
Jack

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Answer 2

Hi there! I would advise using XDocument with XNamespace.
Please look a the code sample: Parsing FB2 format book in C#.
You can use the sample as a starting point to build your application.
The approach uses the XDocument class to get the XElements. The trick with further parsing is to use the correct XNamespace.