2.1确定一个char包含何种字符

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace _02确定一个Char包含何种字符{    class PRogram    {        static void Main(string[] args)        {            Console.WriteLine("请输入一个字符:");            string symbol = Console.ReadLine();            CharKind ck = GetCharKind(Convert.ToChar(symbol));            Console.WriteLine(ck);            string symbol1= Console.ReadLine();            int position=Convert.ToInt32(Console.ReadLine());            CharKind ck1 = GetCharKindInString(symbol1, position);            Console.WriteLine(ck1);            Console.ReadKey();        }        public static CharKind GetCharKind(char theChar)        {            if (char.IsLetter(theChar))            {                return CharKind.Letter;            }            else if (char.IsNumber(theChar))            {                return CharKind.Number;            }            else if (char.IsPunctuation(theChar))            {                return CharKind.Punctuation;            }            else            {                return CharKind.Unknown;            }        }        //判断字符串中某个位置的字符类型        public static CharKind GetCharKindInString(string theString, int CharPosition)        {            if (char.IsLetter(theString, CharPosition))            {                return CharKind.Letter;            }            else if (char.IsNumber(theString, CharPosition))            {                return CharKind.Number;            }            else if (char.IsPunctuation(theString, CharPosition))            {                return CharKind.Punctuation;            }            else            {                return CharKind.Unknown;            }        }    }    public enum CharKind    {        Letter,        Number,        Punctuation,        Unknown    }}