In C#, how do I remove a property from an ExpandoObject?

Question

Say I have this object:

dynamic foo = new ExpandoObject(); foo.bar = "fizz"; foo.bang = "buzz"; 

How would I remove foo.bang for example?

I don't want to simply set the property's value to null--for my purposes I need to remove it altogether. Also, I realize that I could create a whole new ExpandoObject by drawing kv pairs from the first, but that would be pretty inefficient.

Answer 1

Cast the expando to IDictionary<string, object> and call Remove:

var dict = (IDictionary<string, object>)foo; dict.Remove("bang"); 

Answer 2

You can treat the ExpandoObject as an IDictionary<string, object> instead, and then remove it that way:

IDictionary<string, object> map = foo; map.Remove("Jar");