C# 将 ReadKey() 转换为 int

Question

我是 C# 的新手，被告知要创建一个基于文本的口袋妖怪战斗模拟器，所以在下面的代码中，我有一个方法来获取用户输入并决定口袋妖怪获得哪种性质：

public static void NatureSelection(out int statIndex1, out int statIndex2)
    {
        Console.WriteLine("If you wish to have a neutral nature, Enter 0 in the next line, If not, enter any key to continue");
        char holder = Convert.ToChar(Console.ReadKey());
        statIndex1 = Convert.ToInt16(holder);
        if (statIndex1 == 0) 
        {
            statIndex2 = 0;
        }

        Console.WriteLine("Please Select A Nature For Your Pokemon By Entering The Number Beside The Stats That You Want To Increase ");
        statIndex1 = Convert.ToInt16(Console.ReadKey());
        while (!(statIndex1 > 0 && statIndex1 <=5))
        {
            statIndex1 = Convert.ToInt32(Console.ReadKey());
            Console.WriteLine("Invalid Value,Please Try Again");
        }


        Console.WriteLine("Now Enter The Number Beside The Stats That You Want To Decrease ");
        statIndex2 = Convert.ToInt32(Console.ReadKey());
        while (!(statIndex2 > 0 && statIndex2 <= 5))
        {
            statIndex2 = Convert.ToInt16(Console.ReadKey());
            Console.WriteLine("Invalid Value,Please Try Again");
        }

    }

然而，当我尝试将 readkey 转换为 int 时，出现错误：

这一行给出了错误：

char holder = Convert.ToChar(Console.ReadKey());

An unhandled exception of type 'System.InvalidCastException' occurred in mscorlib.dll

Additional information: Unable to cast object of type 'System.ConsoleKeyInfo' to type 'System.IConvertible'.

谁能解释一下这是什么意思，我该如何解决？

Answer 1

肯定是这一行Convert.ToInt16(Console.ReadKey())导致异常，因为转换失败，建议你这样使用：

  int myNumber = (int)(Console.ReadKey().KeyChar);

因为Console.ReadKey() returns a ConsoleKeyInfo所以.KeyChar会给你对应的字符值，使用隐式转换很容易将其转换为整数。但这也会为字符提供 ascii 值。

您的另一个选择是TryParse，这样您也可以识别转换结果。那就是代码将是这样的：

int myNumber;
if (!int.TryParse(Console.ReadKey().ToString(), out myNumber))
{
    Console.WriteLine("Conversion faild");
}
// myNumber holds the result

C# 将 ReadKey() 转换为 int

C# Conversion of ReadKey() to int

c#

int

casting

type-conversion

readkey