What do you think about the advantages/disadvantages of .net 4.0 dynamic types?

Answer 1

They are extremely useful. They can be used to simplify COM interop, to provide a much nicer syntax for Reflection, to enable duck typing, and (of course) to do actual dynamic dispatch.

Answer 2

This very popular question provides a number of uses for dynamic types, which would probably be helpful here.

And this question also provides some help.

Answer 3

As long as

• the types are defined at compile time
• the types held in a dynamic variable cannot change
• errors are caught at compile-time, and not run-time

i'm okay with them.

Otherwise it's untyped variants, and IDispatch interfaces, all over again.

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Exempli Gratia

dynamic c = new ADOdb.Connection();
c.Excute("SELECT * FROM Users");

And the error isn't caught when i compile. :(

Answer 4

I find them very useful. Coming from a C/C++ background, it was weird at first, but now all my variables are dynamic, all I have to worry about is making sure objects have the right interface, not the right type.

It takes a lot of headache out of programming and getting parameters to fit into function calls.

Answer 5

Here is a usage for dynamic on WPF by Josh Smith.