4.8.1　捕捉错误（1）

 Hey you!
Enter your first name: Inigo
Enter your age: forty-two

Unhandled Exception: System.FormatException: Input string was
not in a correct format.
at System.Number.ParseInt32(String s, NumberStyles style,
NumberFormatInfo info)
at ExceptionHandling.Main()

using System;

class ExceptionHandling
{
static int Main()
{
string firstName;
string ageText;
int age;
int result = 0;

      Console.Write("Enter your first name: ");
firstName = Console.ReadLine();

      Console.Write("Enter your age: ");
ageText = Console.ReadLine();

      try
{
age = int.Parse(ageText);
Console.WriteLine(
"Hi {0}! You are {1} months old.",
firstName, age*12); 
}
catch (FormatException )
{
Console.WriteLine(
"The age entered, {0}, is not valid.",
ageText);
result = 1;
}
catch(Exception exception)
{
Console.WriteLine(
"Unexpected error: {0}", exception.Message);
result = 1;
}
finally
{
Console.WriteLine("Goodbye {0}",
firstName);
}
return result;
}
}

Enter your first name: Inigo
Enter your age: forty-two
The age entered, forty-two, is not valid.
Goodbye Inigo