protobuf-net registering type at runtime

ProtobufAutoContract.cs

var model = RuntimeTypeModel.Default;

// Obtain all serializable types having no explicit proto contract
var serializableTypes = Assembly.GetExecutingAssembly()
    .GetTypes()
    .Where(t => t.IsSerializable && !Attribute.IsDefined(t, typeof(ProtoContractAttribute)));
foreach (var type in serializableTypes)
{
    var metaType = model.Add(type, false);
    metaType.AsReferenceDefault = true;
    metaType.UseConstructor = false;

    // Add contract for all the serializable fields
    var serializableFields = type
        .GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
        .Where(fi => !Attribute.IsDefined(fi, typeof(NonSerializedAttribute)))
        .OrderBy(fi => fi.Name)  // it's important to keep the same fields order in all the AppDomains
        .Select((fi, index) => new { info = fi, index });
    foreach (var field in serializableFields)
    {
        var metaField = metaType.AddField(field.index + 1, field.info.Name);
        metaField.AsReference = !field.info.FieldType.IsValueType;       // cyclic references support
        metaField.DynamicType = field.info.FieldType == typeof(object);  // any type support
    }
}

// Compile model in place for better performance, .Compile() can be used if all types are known beforehand
model.CompileInPlace();