如何让 C# 中的程序对用户输入做出反应

Question

下面是我的代码。当我按 5 时，我必须按 5 次回车才能让程序写入该行，而按 6 根本不起作用。任何解决方案将不胜感激。

            Boolean keepRunning = true;
            while (keepRunning = true)
            {
                if (Console.ReadLine() == "1")
                {
                    Console.WriteLine("Still running");
                }
                else if (Console.ReadLine() == "2")
                {
                    Console.WriteLine("Still running2");
                }
                else if (Console.ReadLine() == "3")
                {
                    Console.WriteLine("Still running3");
                }
                else if (Console.ReadLine() == "4")
                {
                    Console.WriteLine("Still running4");
                }
                else if (Console.ReadLine() == "5")
                {
                    Console.WriteLine("Still running5");
                }
                else if (Console.ReadLine() == "6")
                {
                    keepRunning = false;
                }
            }

Answer 1

您正在等待每个 Console.ReadLine(); 的输入。只读一次输入，然后决定要做什么。

并且您应该将 while 条件更改为 keepRunning == true。在您当前的版本中，您根据自己的情况将 keepRunning 设置为 true，这就是为什么“6”似乎不起作用的原因；）

Boolean keepRunning = true;
while (keepRunning == true)
{
    string input = Console.ReadLine();

    if (input == "1")
    {
        Console.WriteLine("Still running");
    }
    else if (input == "2")
    {
        Console.WriteLine("Still running2");
    }
    else if (input == "3")
    {
        Console.WriteLine("Still running3");
    }
    else if (input == "4")
    {
        Console.WriteLine("Still running4");
    }
    else if (input == "5")
    {
        Console.WriteLine("Still running5");
    }
    else if (input == "6")
    {
        keepRunning = false;
    }
}

您可以使用 switch 语句使其变得更好。

switch(input)
{
    case "1":
        Console.WriteLine("Still running");
        break;
    case "2":
        Console.WriteLine("Still running");
        break;
    case "3":
        Console.WriteLine("Still running");
        break;
    case "4":
        Console.WriteLine("Still running");
        break;
    case "5":
        Console.WriteLine("Still running");
        break;
    case "6":
        keepRunning = false;
        break;
    default:
        break;
}

Answer 2

你应该每次迭代只读一行。请参见下面的示例：

string readLine = "";
Boolean keepRunning = true;
while (keepRunning)
{
    readLine= Console.ReadLine();
    switch readLine{
        case "1":
            Console.WriteLine("Still running");
            break;
        case "2":
            Console.WriteLine("Still running2");
            break;
        case "3":
            Console.WriteLine("Still running3");
            break;
        case "4":
            Console.WriteLine("Still running4");
            break;
        case "5":
            Console.WriteLine("Still running5");
            break;
        case "6":
            keepRunning = false;
            break;
    }
}

如何让 C# 中的程序对用户输入做出反应

How to get the program in C# to react to user input

c#

readline

while-loop