How do I reference a field in an ExpandoObject dynamically?

Question

Is there a way to dynamically access the property of an expando using a "IDictionary" style lookup?

var messageLocation = "Message";
dynamic expando = new ExpandoObject();
expando.Message = "I am awesome!";
Console.WriteLine(expando[messageLocation]);

Answer 1

You have to cast the ExpandoObject to IDictionary<string, object> :

var messageLocation = "Message";
dynamic expando = new ExpandoObject();
expando.Message = "I am awesome!";

var expandoDict = (IDictionary<string, object>)expando;
Console.WriteLine(expandoDict[messageLocation]);

(Also your expando variable must be typed as dynamic so property access is determined at runtime - otherwise your sample won't compile)