The ExpandoObject class being added to .NET 4 allows you to arbitrarily set properties onto an object at runtime.
Are there any advantages to this over using a
Dictionary<string, object>, or really even a Hashtable? As far as I can tell, this is nothing but a hash table that you can access with slightly more succinct syntax.
For example, why is this:
dynamic obj = new ExpandoObject(); obj.MyInt = 3; obj.MyString = "Foo"; Console.WriteLine(obj.MyString);
Really better, or substantially different, than:
var obj = new Dictionary<string, object>(); obj["MyInt"] = 3; obj["MyString"] = "Foo"; Console.WriteLine(obj["MyString"]);
What real advantages are gained by using ExpandoObject instead of just using an arbitrary dictionary type, other than not being obvious that you're using a type that's going to be determined at runtime.