Deserialize collection of elements

Hi,

I want to deserialze a collection. My XML structure

<MediaContainer size='1'> 
    <MediaItem Name='Name1' Id='1' />
    <MediaItem Name='Name2' Id='2' />
</MediaContainer>

My class structure

public class MediaContainer
{
    [XmlAttribute("size")]
    public int Size { get; set; }

    [XmlElement("MediaItem")]
    public List<MediaItem> Items { get; set; }
}

public class MediaItem
{
    [XmlAttribute]
    public string Name { get; set; }

    [XmlAttribute]
    public string Id { get; set; }
}

I’ve tried different configuration, but it’s not working. var serializer = new ConfigurationContainer() .EnableImplicitTyping(typeof(MediaContainer), typeof(List<MediaItem>), typeof(MediaItem)) .Type<List<MediaItem>>() .Create(); I got exception:

System.NullReferenceException: Object reference not set to an instance of an object.
    at ExtendedXmlSerializer.ReflectionModel.TypeCoercer.Get(TypeInfo parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ReflectionModel\TypeCoercer.cs:line 35
   at System.Linq.Enumerable.SelectArrayIterator`2.ToArray()
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at System.Collections.Immutable.ImmutableArray.CreateRange[T](IEnumerable`1 items)
   at System.Collections.Immutable.ImmutableArray.ToImmutableArray[TSource](IEnumerable`1 items)
   at ExtendedXmlSerializer.ReflectionModel.SelectCoercer`2.Get(ImmutableArray`1 parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ReflectionModel\SelectCoercer.cs:line 37
   at ExtendedXmlSerializer.Core.Sources.CoercedResult`3.Get(TParameter parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\Core\Sources\CoercedResult.cs:line 37
   at ExtendedXmlSerializer.Core.Sources.CoercedResult`3.Get(TParameter parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\Core\Sources\CoercedResult.cs:line 37
   at ExtendedXmlSerializer.Core.Sources.CoercedResult`3.Get(TParameter parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\Core\Sources\CoercedResult.cs:line 37
   at ExtendedXmlSerializer.Core.Sources.DecoratedSource`2.Get(TParameter parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\Core\Sources\DecoratedSource.cs:line 32
   at ExtendedXmlSerializer.ContentModel.Collections.Lists.CreateAdapter(Object parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Collections\Lists.cs:line 47
   at System.Runtime.CompilerServices.ConditionalWeakTable`2.GetValueLocked(TKey key, CreateValueCallback createValueCallback)
   at System.Runtime.CompilerServices.ConditionalWeakTable`2.GetValue(TKey key, CreateValueCallback createValueCallback)
   at ExtendedXmlSerializer.ExtensionModel.Xml.XmlListContentsActivator.Create(IFormatReader reader, Object instance, XmlContent content) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ExtensionModel\Xml\XmlListContentsActivator.cs:line 41
   at ExtendedXmlSerializer.ExtensionModel.Xml.XmlInnerContentActivator.Get(IFormatReader parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ExtensionModel\Xml\XmlInnerContentActivator.cs:line 50
   at ExtendedXmlSerializer.ContentModel.Content.InnerContentReader.Get(IFormatReader parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Content\InnerContentReader.cs:line 43
   at ExtendedXmlSerializer.ContentModel.Members.Extensions.GetIfAssigned[T](IReader`1 this, IFormatReader reader) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Members\Extensions.cs:line 35
   at ExtendedXmlSerializer.ContentModel.Members.Extensions.GetIfAssigned[T](IReader`1 this, IFormatReader reader) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Members\Extensions.cs:line 35
   at ExtendedXmlSerializer.ContentModel.Members.MemberHandler.Handle(IInnerContent contents, IMemberSerializer member) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Members\MemberHandler.cs:line 37
   at ExtendedXmlSerializer.ContentModel.Members.MemberInnerContentHandler.IsSatisfiedBy(IInnerContent parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Members\MemberInnerContentHandler.cs:line 50
   at ExtendedXmlSerializer.ContentModel.Members.MemberInnerContentHandler.Execute(IInnerContent parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Members\MemberInnerContentHandler.cs:line 59
   at ExtendedXmlSerializer.ContentModel.Content.InnerContentReader.Get(IFormatReader parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Content\InnerContentReader.cs:line 46
   at ExtendedXmlSerializer.ContentModel.Members.Extensions.GetIfAssigned[T](IReader`1 this, IFormatReader reader) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ContentModel\Members\Extensions.cs:line 35
   at ExtendedXmlSerializer.Read`1.Get(T parameter) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\Read.cs:line 49
   at ExtendedXmlSerializer.ExtensionModel.Xml.Extensions.Deserialize[T](IExtendedXmlSerializer this, IXmlReaderFactory factory, Stream stream) in C:\projects\extendedxmlserializer\src\ExtendedXmlSerializer\ExtensionModel\Xml\Extensions.cs:line 291

How I can configure container to deserialize my xml?

[Mike-E-angelo]

Hey @martin211 thanks for writing in here.

You were close. 😃 I have created an example of a passing test here that shows you how to configure your container:

https://github.com/wojtpl2/ExtendedXmlSerializer/blob/ea48cfcbb262734af7a9159bb1a8ad45a0f75a2f/test/ExtendedXmlSerializer.Tests/ReportedIssues/Issue243Tests.cs#L15-L40

Please note that:

1. The elements in this example are prefixed with Issue243Tests- as the classes used have been put into the containing test as nested classes.
2. The use of XmlElementAttribute to signify child content is not supported in v2 currently. It is a known issue and captured in #240. In the meantime, you will have to specify a MediaItem as shown in the example.

Please let me know if you have any further questions and I will do my best to assist. 👍

[martin211]

@Mike-EEE Hmm… XSLT… you just gave me a good idea!!!