Question

所以我正在尝试编写一个程序来输入用户的字符串值。我正在尝试使用开关来确定“a”和“b”之间的按键。我不断收到以下错误：参数1：无法从'方法组'转换为'布尔'。

namespace ConsoleApplication4
{
    class Program
   {
    static void Main(string[] args)
    {
        const string a = " You pressed a";
        const string b = " You pressed b";

        string input = Console.ReadLine();

        switch(input)
        {
            case a:
                ShowData(a);

                break;

            case b:
                ShowData(b);
                break;

            default:
                Console.WriteLine(" You did not type a or b");
                Console.WriteLine();
                Console.ReadLine();
                break;
        }
    }

     static void ShowData(string a)
    {
        Console.WriteLine(ShowData);
    }

   }
}

Answer 1

尝试这些更正：

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            const string a = " You pressed a";
            const string b = " You pressed b";

            string input = Console.ReadLine();

            switch (input)
            {
                case "a": // correction 1
                    ShowData(a);
                    break;

                case "b": // correction 2
                    ShowData(b);
                    break;

                default:
                    Console.WriteLine(" You did not type a or b");
                    Console.WriteLine();
                    Console.ReadLine();
                    break;
            }
        }

        static void ShowData(string a)
        {
            Console.WriteLine(a); // correction 3
        }

    }
}

Answer 2

您遇到的错误似乎是因为您正在尝试编写ShowData方法，

static void ShowData(string a)
    {
        Console.WriteLine(ShowData);
    }

应该是：

static void ShowData(string a)
    {
        Console.WriteLine(a);
    }

我会说你根本不需要ShowData方法，因为你也可以直接在你的交换机上写一个，但这取决于你。

这将消除错误，但我仍然只得到结果＆＃34;你没有输入a或b＆＃34;。这是因为您的案例不正确。由于您正在寻找字符串a，您的情况应该是

case "a":

而不是

case a:

更改此项将提供所需的行为。这是我最终的最终代码：

namespace ConsoleApplication4
{
class Program
{
    static void Main(string[] args)
    {
        const string a = " You pressed a";
        const string b = " You pressed b";

        string input = Console.ReadLine();

        switch (input)
        {
            case "a":   //Case changed to "a" instead of a
                ShowData(a);        //Here, we could use Console.writeLine(a) directly if we wanted.
                Console.WriteLine();
                Console.ReadLine();
                break;

            case "b":   //Case changed to "b" instead of b
                ShowData(b);    //Here, we could use Console.writeLine(b) directly if we wanted.
                Console.WriteLine();
                Console.ReadLine();
                break;

            default:
                Console.WriteLine(" You did not type a or b");
                Console.WriteLine();
                Console.ReadLine();
                break;
        }
    }

    static void ShowData(string a)
    {
        Console.WriteLine(a);   //Changed from ShowData to a
    }

}
}

Answer 3

您正在将ShowData传递给控制台。我想你打算写Console.WriteLine(a);而不是Console.WriteLine(ShowData);

使用switch语句确定用户输入是什么

3 个答案: