虽然语句忽略响应值

Question

我有一个命令行要求用户说（Y/N），并将此值传递给checkResponse方法。

由于某种原因，while循环忽略了值，即使当我调试它显示的值是“Y”。当值被设置为“N”时，它也继续循环。如果我将while语句移到while语句下面，程序的一半工作。我可以发送一个初始值“Y”，while语句将忽略它并开始运行它内部的代码。

任何想法，我失踪或俯视？

在此先感谢。从OR

public void checkResponse(string response, string confirmValue) 
{ 
    Console.WriteLine(response); 
    Console.WriteLine(response); 
    if (response == "Y") 
    { 
     return; 
    } 
    else if (response == "N") 
    { 
     Environment.Exit(0); 
    } 
    else 
    { 
     while ((response != "Y") || (response != "N")) 
     { 
      Console.Clear(); 
      Console.WriteLine("\"" + response + "\" is not a valid response."); 
      Console.WriteLine(); 
      Console.WriteLine("You entered:" + confirmValue); 
      Console.WriteLine("Is this correct? (Y/N)"); 
      response = Console.ReadLine().ToUpper(); 
     } 
    } 
} 

Answer 1

改变为AND逻辑运算：

(response != "Y") && (response != "N") 

Answer 2

while ((response != "Y") || (response != "N")) 

总是为真，作为响应不能Y和n同时。

Answer 3

你((response != "Y") || (response != "N"))总是true

Answer 4

确定。如果while循环终止？我们希望它回再次检查：

public void checkResponse(string response, string confirmValue) 
{ 
Check: 
    Console.WriteLine(response); 
    Console.WriteLine(response); 
    if (response == "Y") 
    { 
     return; 
    } 
    else if (response == "N") 
    { 
     Environment.Exit(0); 
    } 
    else 
    { 
     while ((response != "Y") && (response != "N")) 
     { 
      Console.Clear(); 
      Console.WriteLine("\"" + response + "\" is not a valid response."); 
      Console.WriteLine(); 
      Console.WriteLine("You entered:" + confirmValue); 
      Console.WriteLine("Is this correct? (Y/N)"); 
      response = Console.ReadLine().ToUpper(); 
     } 
     goto Check; 
    } 
} 

或者，更好：

public void checkResponse(string response, string confirmValue) 
{ 
    Console.WriteLine(response); 
    while (response != "Y" && response != "N") 
    { 
      Console.Clear(); 
      Console.WriteLine("\"" + response + "\" is not a valid response."); 
      Console.WriteLine(); 
      Console.WriteLine("You entered:" + confirmValue); 
      Console.WriteLine("Is this correct? (Y/N)"); 
      response = Console.ReadLine().ToUpper(); 
    } 
    if (response == "N") 
      Environment.Exit(0); 
} 

Answer 5

你确定输入大写呢？您可以使用equals方法并忽略该情况。

message.Equals("Y", StringComparison.InvariantCultureIgnoreCase); 

编辑：虽然这可能是更好的错误与或而​​不是一个是你的实际问题。