Convert anonymous type to dynamic

ObjectExpandoObjectExtensions.cs

public static ExpandoObject ToExpandoObject(this object obj)
{
    if (obj == null)
        throw new ArgumentNullException(nameof(obj));

    IDictionary<string, object> expando = new ExpandoObject();

    foreach (PropertyDescriptor property in TypeDescriptor.GetProperties(obj.GetType()))
        expando.Add(property.Name, property.GetValue(obj));

    return (ExpandoObject) expando;
}