Is it possible to use ExpandoObject to create run-time properties?

Question

Normally, we can create properties like this,

dynamic expando = new ExpandoObject();
expando.Price = 45k;
expando.Value = "Good";

In my case, I won't know the properties such as "Price" or "Value" until runtime. How, can I create such dynamic properties. Something like,

dynamic expando = new ExpandoObject();
expando[properties[0]] = 45k;
expando[properties[1]] = "Good";
expando[properties[2]] = "Red";
expando[properties[3]] = 8;

Anyway to achieve this kind of behavior.

Answer 1

Just use the fact that it implements IDictionary<string, Object>:

IDictionary<string, Object> expando = new ExpandoObject();
expando[properties[0]] = 45;
expando[properties[1]] = "Good";
expando[properties[2]] = "Red";
expando[properties[3]] = 8;

dynamic d = expando;
// Now use the properties as normal

On the other hand, if you don't know the properties until execution time, what's actually going to consume them? It may still make sense to use ExpandoObject - but equally it may make sense to use Dictionary<string, object> to start with.