Information Technology Reference
In-Depth Information
This code produces the following output:
sb: 208
Unhandled Exception: System.OverflowException: Arithmetic operation resulted
in an overflow. at Test1.Test.Main() in C:\Programs\Test1\Program.cs:line 21
The checked and unchecked Statements
The
checked
and
unchecked
operators
, which you just looked at in the previous section, act
on the single expression between the parentheses. The
checked
and
unchecked
statements
per-
form the same function, but control all the conversions in a block of code, rather than in a
single expression.
The
checked
and
unchecked
statements can be nested to any level.
For example, the following code uses
checked
and
unchecked
statements, and produces the
same results as the previous example, which uses
checked
and
unchecked
expressions. In this
case, however, blocks of code are affected, rather than just expressions.
byte sb;
ushort sh = 2000;
unchecked // Set unchecked
{
sb = (byte) sh;
Console.WriteLine("sb: {0}", sb);
checked // Set checked
{
sb = (byte) sh;
Console.WriteLine("sb: {0}", sh);
}
}
