using System;

using System.Collections.Generic;

using YamlDotNet.Core;

using YamlDotNet.Core.Events;

using YamlDotNet.Serialization;

​

public class KeyValuePairNodeDeserializer : INodeDeserializer

{

    public bool Deserialize(IParser parser, Type expectedType, Func<IParser, Type, object> nestedObjectDeserializer, out object value)

    {

        if (expectedType.IsGenericType && expectedType.GetGenericTypeDefinition() == typeof(KeyValuePair<,>))

        {

            var pairArgs = expectedType.GetGenericArguments();

            object pairKey = null;

            object pairValue = null;

            parser.Expect<MappingStart>();

            while (parser.Allow<MappingEnd>() == null)

            {

                var keyName = parser.Expect<Scalar>();

                switch (keyName.Value)

                {

                    case "Key":

                        pairKey = nestedObjectDeserializer(parser, pairArgs[0]);

                        break;

​

                    case "Value":

                        pairValue = nestedObjectDeserializer(parser, pairArgs[1]);

                        break;

                    default:

                        throw new YamlException(keyName.Start, keyName.End,

                            string.Format("Expected one of ['Key', 'Value'], got '{0}' (at {1}).", keyName.Start));

                }

            }

            value = Activator.CreateInstance(expectedType, pairKey, pairValue);

            return true;

        }

        value = null;

        return false;

    }

}

​

public class Model

{

    public KeyValuePair<string, int> Pair { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var serializer = new SerializerBuilder()

            .Build();

        var yaml = serializer.Serialize(new Model

        {

            Pair = new KeyValuePair<string, int>("key", 1)

        });

        yaml.Dump();

        var deserializer = new DeserializerBuilder()

            .WithNodeDeserializer(new KeyValuePairNodeDeserializer())

            .Build();

        var parsed = deserializer.Deserialize<Model>(yaml);

        parsed.Dump();

    }

}