Implicitly Typed variables were implemented poorly IMO. I know you should really only use them when working with Linq expressions, but it's annoying that you can't declare them outside of local scope.
From MSDN:
- var can only be used when a local variable is declared and initialized in the same statement; the variable cannot be initialized to null, or to a method group or an anonymous function.
- var cannot be used on fields at class scope.
- Variables declared by using var cannot be used in the initialization expression. In other words, this expression is legal: int i = (i = 20); but this expression produces a compile-time error: var i = (i = 20);
- Multiple implicitly-typed variables cannot be initialized in the same statement.
- If a type named var is in scope, then the var keyword will resolve to that type name and will not be treated as part of an implicitly typed local variable declaration.
The reason I think it's a poor implementation is that they call it var, but it's a long way from being a variant. It's really just shorthand syntax for not having to type the fully class name (except when used with Linq)
