Object.Extend

ObjectExtend.cs

public static class ObjectExtend
{
    public static dynamic Extend(this object source, params object[] objs)
    {
        var result = new ExpandoObject();
        var props = (IDictionary<string, object>)result;

        foreach (var o in new[] { source }.Union(objs))
        {
            var expandoProperties = (
                    o is ExpandoObject expando
                        ? (IDictionary<string, object>)expando
                        : new Dictionary<string, object>())
                .Select(pair => new { Name = pair.Key, pair.Value });

            var typeProperties = o.GetType().GetProperties()
                .Select(p => new {p.Name, Value = p.GetValue(o)});

            var properties = expandoProperties.Concat(typeProperties);

            foreach (var p in properties)
            {
                if (props.ContainsKey(p.Name)) props[p.Name] = p.Value;
                else props.Add(p.Name, p.Value);
            }
        }
        return result;
    }
}