Question

不确定我在这里做错了什么。我有一个程序，要求输入，2个选项之一，然后显示相关选项的成本。

我收到错误消息“mscorlib.dll中发生了'System.FormatException'类型的未处理异常

附加信息：字符串必须只有一个字符长。“

我的代码出了什么问题？见下文：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;


namespace computerPackage
{
    class Program
    {
        static void Main(string[] args)
        {
            char computerPackage;
            const decimal DELUXE_PACKAGE = 1500;
            const decimal SUPER_PACKAGE = 1700;
            Console.Write("Input the Computer Package D or S: ");
            computerPackage = char.Parse(Console.ReadLine());
            computerPackage = Char.ToUpper(computerPackage);
            if (computerPackage == 'D')
            {
                Console.WriteLine("Cost of Deluxe Computer Package is " + DELUXE_PACKAGE.ToString("D"));
            }
            else if (computerPackage == 'S')
            {
                Console.WriteLine("Cost of Deluxe Computer Package is " +
                SUPER_PACKAGE.ToString("S"));
            }
            else
            {
                Console.WriteLine("Package D or S not entered");
            }
            Console.WriteLine("Press any key to continue...");
            Console.ReadKey();          // pause
        }
    }
}

Answer 1

说明错误Console.WriteLine("Cost of Deluxe Computer Package is " + DELUXE_PACKAGE.ToString(D));告诉运行时环境将其设置为datetime格式的原因。将其更改为Console.WriteLine("Cost of Deluxe Computer Package is " + DELUXE_PACKAGE.ToString());

Answer 2

问题来自小数点上的ToString方法。您可以请求特定格式，请在此处查看：

ToString(Format)

C＃mscorlib.dll中发生了未处理的“System.FormatException”类型异常

2 个答案: