Question

我正在寻求用户在控制台上的输入

            cki = Console.ReadKey();
            Console.WriteLine("");
            string character = cki.KeyChar.ToString();
            if (character == "1")
            {
                Console.WriteLine("Please wait...");
                Name_Updater nu = new Name_Updater();
                nu.Name_Update();
            }
            else if (character == "2")
            {
                Console.WriteLine("Please wait...");
                WCM_Interaction wi = new WCM_Interaction();
                wi.Interact_WCM();
            }
            else
            {
                Console.WriteLine("Invalid key! Please try again");
            }

但如果用户输入无效输入，则在一次迭代后停止。但是我希望它接受来自用户的输入，直到它收到有效输入，但我对放置循环的位置感到困惑。

Answer 1

cki = Console.ReadKey();
string character = cki.KeyChar.ToString();
while (true) // infinite loop
{
        if (character == "1")
        {
            Console.WriteLine("Please wait...");
            Name_Updater nu = new Name_Updater();
            nu.Name_Update();
            break; // break from loop if you read "1"
        }
        if (character == "2")
        {
            Console.WriteLine("Please wait...");
            WCM_Interaction wi = new WCM_Interaction();
            wi.Interact_WCM();
            break;  // break from loop if you read "2"
        }
        // repeat loop if invalid entery
        Console.WriteLine("Invalid key! Please try again");
        cki = Console.ReadKey();
        character = cki.KeyChar.ToString();
}

Answer 2

bool correctInput = false;
while (!correctInput)
{
  correctInput = true;

  string decision = Console.ReadLine();
  int iDecision;
  if (int.TryParse(decision, out iDecision))
    switch (iDecision)
    {
      case 0:
        // do something
        break;
      case 1:
        // do something else
        break;
      default:
        correctInput = false;
        break;
    }
  else
    correctInput = false;

  if (!correctInput)
    Console.WriteLine("Tell user their input was bad.");
}

Answer 3

您可以放置一个do while循环来进行迭代。它可以嵌入：

 cki = Console.ReadKey();
        Console.WriteLine("");
        string character;
        bool flag=true;
        do
        {
            character = cki.KeyChar.ToString();
            if (character == "1")
            {
                Console.WriteLine("Please wait...");
                Name_Updater nu = new Name_Updater();
                nu.Name_Update();
                flag=false;
            } 
            else if (character == "2")
            {
                Console.WriteLine("Please wait...");
                WCM_Interaction wi = new WCM_Interaction();
                wi.Interact_WCM();
                flag=false;
            }
            else
            {
                Console.WriteLine("Invalid key! Please try again");
            }
        }while(flag)

Answer 4

您可以这样做，它的作用是创建一个标志，然后在满足条件时将其设置为true。

bool isValid = false;
while (!isValid)
{
    var cki = Console.ReadKey();
    Console.WriteLine("");
    string character = cki.KeyChar.ToString();
    if (character == "1")
    {
        Console.WriteLine("Please wait...");
        //Name_Updater nu = new Name_Updater();
        //nu.Name_Update();
        isValid = true;
    }
    else if (character == "2")
    {
        Console.WriteLine("Please wait...");
        //WCM_Interaction wi = new WCM_Interaction();
        //wi.Interact_WCM();
        isValid = true;
    }
    else
    {
        Console.WriteLine("Invalid key! Please try again");
    }

}

从用户获取输入直到收到有效输入

4 个答案: