如何使用console.readline（）读取整数？ [英] How to read an integer using console.readline()?

问题描述

我是一个正在学习.NET的初学者。

I'm a beginner who is learning .NET.

我尝试在控制台读取行中解析我的整数，但是它显示格式异常。

I tried parsing my integer in console readline but it shows a format exception.

我的代码：

using System;
namespace inputoutput
{
    class Program
    {        
        static void Main()
        {
            string firstname;
            string lastname;
         // int age = int.Parse(Console.ReadLine());
            int age = Convert.ToInt32(Console.ReadLine());
            firstname = Console.ReadLine();
            lastname=Console.ReadLine();
            Console.WriteLine("hello your firstname is {0} Your lastname is {1} Age: {2}",
                firstname, lastname, age);
        }
    }
}

推荐答案

如果引发格式异常，则表示输入无法解析为 int 。您可以使用 int.TryParse（）之类的方法更有效地进行检查。例如：

If it's throwing a format exception then that means the input isn't able to be parsed as an int. You can check for this more effectively with something like int.TryParse(). For example:

int age = 0;
string ageInput = Console.ReadLine();
if (!int.TryParse(ageInput, out age))
{
    // Parsing failed, handle the error however you like
}
// If parsing failed, age will still be 0 here.
// If it succeeded, age will be the expected int value.

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