Can C# compiler be configured to give warning when explicit cast may cause data loss?

Question

Is there a way to configure the VS2008 C# compiler to give a warning for code like this:

Int64 x = 123456789000;
Int32 y = (Int32)x;

Answer 1

The whole point of an explicit cast is to say that "I take responsibility for the problem, please just do it."

In your trivial case, it would perhaps be easy for the compiler to figure out that the value would not fit in a Int32, and thus produce your warning.

However, what about this:

Int64 x = CallSomeMethod();
Int32 y = (Int32)x;

How can it warn you about this? Should it:

1. try to figure out what kind of range the value from CallSomeMethod could return?
2. always warn? (then what would the point be?)

The best you can hope for here is to have a runtime check, or similar, the compiler cannot prevent you from everything that could go wrong.