KnownTypeDataContractResolver.cs

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using System.Diagnostics.CodeAnalysis;
using System.Xml;
 
namespace System.Runtime.Serialization;
 
internal sealed class KnownTypeDataContractResolver : DataContractResolver
{
    private readonly XmlObjectSerializerContext _context;
 
    internal KnownTypeDataContractResolver(XmlObjectSerializerContext context)
    {
        _context = context;
    }
 
    [RequiresUnreferencedCode("Data Contract Serialization and Deserialization might require types that cannot be statically analyzed. Make sure all of the required types are preserved.")]
    public override bool TryResolveType(Type type, Type declaredType, DataContractResolver knownTypeResolver, out XmlDictionaryString typeName, out XmlDictionaryString typeNamespace)
    {
        if (type == null)
        {
            typeName = null;
            typeNamespace = null;
            return false;
        }
        if (declaredType != null && declaredType.IsInterface && CollectionDataContract.IsCollectionInterface(declaredType))
        {
            typeName = null;
            typeNamespace = null;
            return true;
        }
        DataContract dataContract = DataContract.GetDataContract(type);
        if (_context.IsKnownType(dataContract, dataContract.KnownDataContracts, declaredType))
        {
            typeName = dataContract.Name;
            typeNamespace = dataContract.Namespace;
            return true;
        }
        typeName = null;
        typeNamespace = null;
        return false;
    }
 
    [RequiresUnreferencedCode("Data Contract Serialization and Deserialization might require types that cannot be statically analyzed. Make sure all of the required types are preserved.")]
    public override Type ResolveName(string typeName, string typeNamespace, Type declaredType, DataContractResolver knownTypeResolver)
    {
        if (typeName == null || typeNamespace == null)
        {
            return null;
        }
        return _context.ResolveNameFromKnownTypes(new XmlQualifiedName(typeName, typeNamespace));
    }
}