How do I convert a decimal to an int in C#?

Question

How do I convert a decimal to an int?

Answer 1

I find that the casting operator does not work if you have a boxed decimal (i.e. a decimal value inside an object type). Convert.ToInt32(decimal as object) works fine in this case.

This situation comes up when retrieving IDENTITY/AUTONUMBER values from the database:

SqlCommand foo = new SqlCommand("INSERT INTO...; SELECT SCOPE_IDENTITY()", conn);
int ID = Convert.ToInt32(foo.ExecuteScalar());  // works
int ID = (int)foo.ExecuteScalar();              // throws InvalidCastException

See 4.3.2 Unboxing conversions