ScopedKnownTypes.cs

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using System.Collections.Generic;
using System.Xml;
 
namespace System.Runtime.Serialization;
 
internal struct ScopedKnownTypes
{
    internal Dictionary<XmlQualifiedName, DataContract>[] dataContractDictionaries;
 
    private int _count;
 
    internal void Push(Dictionary<XmlQualifiedName, DataContract> dataContractDictionary)
    {
        if (dataContractDictionaries == null)
        {
            dataContractDictionaries = new Dictionary<XmlQualifiedName, DataContract>[4];
        }
        else if (_count == dataContractDictionaries.Length)
        {
            Array.Resize(ref dataContractDictionaries, dataContractDictionaries.Length * 2);
        }
        dataContractDictionaries[_count++] = dataContractDictionary;
    }
 
    internal void Pop()
    {
        _count--;
    }
 
    internal DataContract GetDataContract(XmlQualifiedName qname)
    {
        for (int num = _count - 1; num >= 0; num--)
        {
            Dictionary<XmlQualifiedName, DataContract> dictionary = dataContractDictionaries[num];
            if (dictionary.TryGetValue(qname, out var value))
            {
                return value;
            }
        }
        return null;
    }
}