抛出一个格式异常C＃ [英] Throw a format exception C#

问题描述

我想扔在例如某人格式异常试图促使他们的年龄时，进入一个非整数的性格。

I'm trying to throw a format exception in the instance someone tries to enter a non-integer character when prompted for their age.

        Console.WriteLine("Your age:");
        age = Int32.Parse(Console.ReadLine());

我不熟悉C＃语言，可以写一个try catch块这个实例中使用帮助。

I'm unfamiliar with C# language and could use help in writing a try catch block for this instance.

非常感谢。

推荐答案

这代码已经抛出 FormatException 。如果你的意思是你想要的抓的话，你可以写：

That code will already throw an FormatException. If you mean you want to catch it, you could write:

Console.WriteLine("Your age:");
string line = Console.ReadLine();
try
{
    age = Int32.Parse(line);
}
catch (FormatException)
{
    Console.WriteLine("{0} is not an integer", line);
    // Return? Loop round? Whatever.
}

不过，这将是的更好的使用 int.TryParse ：

Console.WriteLine("Your age:");
string line = Console.ReadLine();
if (!int.TryParse(line, out age))
{
    Console.WriteLine("{0} is not an integer", line);
    // Whatever
}

这避免了异常的相当平常情况下，的用户错误。

This avoids an exception for the fairly unexceptional case of user error.

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