An extension method on Object in C#, that converts statically-typed objects to dynamic objects with the same structure.

ObjectToDynamic.cs

public static class ObjectExtensions {
  public static dynamic ToDynamic(this object value) {
    IDictionary<string, object> expando = new ExpandoObject();
    var properties = TypeDescriptor.GetProperties(value.GetType());
    foreach (PropertyDescriptor property in properties) {
      expando.Add(property.Name, property.GetValue(value));
    }
    return (ExpandoObject)expando;
  }
}

// Using this extension method, you can convert any .NET object into a dynamic object with a similar structure.

public class Customer {
  public int Id { get; set; }
  public string FirstName { get; set; }
  public string LastName { get; set; }
  public string Company { get; set; }
}

var myCustomer = new Customer { 
  Id = 12345,
  FirstName = "Dylan",
  LastName = "Beattie",
  Company = "Ursatile Ltd"
};

// this won't work, because Customer doesn't have a _links field and you can't add arbitrary properties to a static type:
myCustomer._links = new { 
  self = new {
    href = "/customers/12345";
  } 
}

// BUT we can do this:

var result = myCustomer.ToDynamic();
result._links = new { 
  self = new {
    href = "/customers/12345";
  } 
}

// and then when we serialize result to a JSON object, we get hypermedia properties included.
var json = JsonConvert.SerializeObject(result);