Pro C# 2010 and the .NET 4 Platform, Fifth Edition

18.1. The Role of the C# dynamic Keyword

Back in Chapter 3, you learned about the var keyword, which allows you to define local variable in such a way that the underlying date type is determined by the initial assignment (recall that this is termed implicit typing). Once this initial assignment has been made, you have a strongly typed variable, and any attempt to assign an incompatible value will result in a compiler error.

To begin your investigation into the C# dynamic keyword, create a new Console Application named DynamicKeyword. Now, author the following method in your Program class, and verify that the final code statement will indeed trigger a compile time error if uncommented:

static void ImplicitlyTypedVariable()
{
  // a is of type List<int>. ...