Question

我无法弄清楚如何让控制台错误检查用户输入然后打开请求的文件。有人能告诉我我做错了吗？

这是我目前的计划。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace ConsoleApplication5
{
class Program
{
    static void Main(string[] args)
    {
        while (true)
        {
            Console.WriteLine(">Enter File to open.");//Prompt user for file name

            try
            {
                if (!File.Exists(Console.ReadLine())) 
                throw new FileNotFoundException();//Check for errors

            }
            catch (FileNotFoundException)
            {
                Console.WriteLine("You stuffed up!"); //Display error message
            }
        }
            System.Diagnostics.Process.Start(@Console.ReadLine()); //set valid reply response
            Console.ReadLine();
        }


    }
}

Answer 1

此行中有分号 if (!File.Exists(Console.ReadLine())) ;

如果在if声明之后只有一行，则不会在if语句中加分号

if (!File.Exists(Console.ReadLine()))
                throw new FileNotFoundException();//Check for errors

否则

if (!File.Exists(Console.ReadLine())){
                throw new FileNotFoundException();//Check for errors

//some more code
}

修改

class Program { static void Main(string[] args) { while (true) { Console.WriteLine(">Enter File to open.");//Prompt user for file name string s = Console.ReadLine(); try { if (!File.Exists(s)) throw new FileNotFoundException();//Check for errors else System.Diagnostics.Process.Start(s); //set valid reply response Console.ReadLine(); } catch (FileNotFoundException) { Console.WriteLine("You stuffed up!"); //Display error message } } } }

Answer 2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace ABCD
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.WriteLine(">Enter File to open.");//Prompt user for file name
                string fileName = Console.ReadLine();
                try
                {
                    if (!File.Exists(fileName))
                        throw new FileNotFoundException();//Check for errors
                    else
                        System.Diagnostics.Process.Start(fileName); //set valid reply response

                    Console.ReadLine();
                }
                catch (FileNotFoundException)
                {
                    Console.WriteLine("You stuffed up!"); //Display error message
                }
            }
        }
    }
}

只需确保输入文件名即可执行文件“。exe”扩展名，并确保提供完整路径。

即。输入“C：\ Program Files \ Internet Explorer \ iexplore.exe”之类的输入，打开Internet Explorer

C＃打开变量文件，显示错误消息

2 个答案: