获取动态对象的PropertyInfo

Question

I have a library that is doing a bunch of reflection work relying on the PropertyInfo of the classes it receives (to get and set values).

Now I want to be able to work with dynamic objects, but I can't find how to get the PropertyInfo of a dynamic's properties. I've checked the alternatives, but for those I'd need to change everywhere I use PropertyInfo to get/set values.

dynamic entity = new ExpandoObject();
entity.MyID = 1;

// - Always null
PropertyInfo p = entity.GetType().GetProperty("MyID");
// - Always null
PropertyInfo[] ps = entity.GetType().GetProperties();

// - These are called everywhere in the code
object value = p.GetValue(entity);
p.SetValue(entity, value);

Is it possible to get or create a PropertyInfo somehow just to be able to use it's GetValue() and SetValue() on a dynamic object?

Answer 1

Under the covers an ExpandoObject is really just a dictionary. You can get at the dictionary just by casting it.

dynamic entity = new ExpandoObject();
entity.MyID = 1;

if(entity.GetType() == typeof(ExpandoObject))
{
    Console.WriteLine("I'm dynamic, use the dictionary");
    var dictionary = (IDictionary<string, object>)entity;
}
else
{
    Console.WriteLine("Not dynamic, use reflection");
}

You could modify your Mapping method to check if the object being passed in is dynamic and route through a different path that just iterates over the keys of the dictionary.

https://dotnetfiddle.net/VQQZdy