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我要求用戶輸入一個int年齡,但程序崩潰時,他們輸入一個字符串(顯然)。C#停止用戶輸入一個字符/字符串,而不是整數
我該如何去允許他們輸入一個字符/字符串,但程序顯示一個有趣的消息,然後退出?
這是我這麼遠:
Console.WriteLine("Please can you enter your age");
int userage = Convert.ToInt32(Console.ReadLine());
if (userage < 16)
{
var underage = new underage();
underage.text();
}
else if (userage>122)
{
Console.WriteLine("No one has ever reached this age and so you can't possibly be this old");
Console.WriteLine("Please enter a different age next time!");
Console.WriteLine("Unless you really are this old, in which case don't work!!");
Console.WriteLine("Press any key to exit the program.\n");
Environment.Exit(0);
}
else if(userage<122)
{
Console.WriteLine("Ah brilliant, you are old enough to use our services\n");
Console.WriteLine("We shall continue as first planned\n");
}
else
{
}
使用['int.TryParse'](https://msdn.microsoft.com/en-us /library/f02979c7(v=vs.110).aspx) –
在那段代碼中,我會添加int.TryParse? –
開始閱讀用戶輸入之後。將'Console.ReadLine'存儲在一個字符串變量中,並將其用作'int.TryParse'的參數。 'Int.TryParse'返回一個'bool'。如果它是真的,則int變量將具有有效值,如果它爲假,則知道用戶輸入不是有效整數。 –