c# - 用户选项是/否

Question

我需要在文件存在时向用户显示一些消息，显示消息“文件存在...你想覆盖它吗？？”

if (File.Exists(binaryFilePath))
{
    Program.DisplayMessage("The file: " + binaryFileName + " exist. You want to overwrite it? Y/N");
    string overwrite = Console.ReadLine();
    while (overwrite != null)
    {
        if (overwrite.ToUpper() == "Y")
        {
        WriteBinaryFile(frameCodes, binaryFilePath);

        } if (overwrite.ToUpper() == "N")
        {
        throw new IOException();
        overwrite = null;
        } if (overwrite.ToUpper() != "Y" && overwrite.ToUpper() != "N")
        {
        Program.DisplayMessage("!!Please Select a Valid Option!!");
        overwrite = Console.ReadLine();
        }
    }
}

如果用户写“Y”，进程启动并正常完成...问题是如何停止？？我尝试了一段时间，但没有用...

我该怎么做？

Answer 1

if (File.Exists(binaryFilePath))
{
  while (true)
  {
  Program.DisplayMessage("The file: " + binaryFileName + " already exist. Do you want to overwrite it? Y/N");
    string overwrite = Console.ReadLine();
    if (overwrite.ToUpper().Equals("Y"))
    {
      WriteBinaryFile(frameCodes, binaryFilePath);
      break;
    } 
    else if (overwrite.ToUpper().Equals("N"))
    {
      Console.WriteLine("Aborted by user.");
      break;
    } 
    else
    {
      Program.DisplayMessage("!!Please Select a Valid Option!!");
      overwrite = Console.ReadLine();
      continue; // not needed - for educational use only ;)
    }
  }
}

试试看，然后去学习基础知识(条件、循环、英语……)。然后你可以回头问为什么在你的情况下抛出异常(尤其是那个异常)是错误的；)