C# 4: Real-World Example of Dynamic Types

Question

I think I have my brain halfway wrapped around the Dynamic Types concept in C# 4, but can\'t for the life of me figure out a scenario where I\'d actually want to use it.

Answer 1

There's one example on MSDN:

Many COM methods allow for variation in argument types and return type by designating the types as object. This has necessitated explicit casting of the values to coordinate with strongly typed variables in C#. If you compile by using the /link (C# Compiler Options) option, the introduction of the dynamic type enables you to treat the occurrences of object in COM signatures as if they were of type dynamic, and thereby to avoid much of the casting.

Another example is if you have to interop with dynamic languages.

Also there are some occasions where you want to make some code generic but you can't because even though the objects implement the same method, they don't share a suitable base class or interface that declares the methods you need. An example of this is trying to make something generic with ints and short. It's a bit of a hack, but dynamic allows you to call the same methods on these different types, allowing more code reuse.

Update: A bit of searching on here found this related post.