C# 允许我们创建用户定义的或自定义的异常。它用于产生有意义的异常。为此，我们需要继承 Exception 类。
using System;
public class InvalidAgeException : Exception
{
public InvalidAgeException(String message)
: base(message)
{
}
}
public class TestUserDefinedException
{
static void validate(int age)
{
if (age < 18)
{
throw new InvalidAgeException("Sorry, Age must be greater than 18");
}
}
public static void Main(string[] args)
{
try
{
validate(12);
}
catch (InvalidAgeException e) { Console.WriteLine(e); }
Console.WriteLine("Rest of the code");
}
}
输出:
InvalidAgeException: Sorry, Age must be greater than 18 Rest of the code