C#中使用Char类中的方法对字符进行各种操作，判断是否为字母、数字、标点符号、分隔符或空白。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace text
{
    class Program
    {
        static void Main(string[] args)
        {
            char a = 'a';
            char b = '8';
            char c = 'L';
            char d = '.';
            char e = '|';
            char f = ' ';
            Console.WriteLine("IsLetter判断a是否为字母：{0}", Char.IsLetter(a));
            Console.WriteLine("IsDigit判断b是否为数字：{0}", Char.IsDigit(b));
            Console.WriteLine("IsLetterOrDigit判断c是否为字母或数字：{0}", Char.IsLetterOrDigit(c));
            Console.WriteLine("IsLower判断a是否为小写字母：{0}", char.IsLower(a));
            Console.WriteLine("IsUpper判断c是否为大写字母：{0}", char.IsUpper(c));
            Console.WriteLine("IsPunctuation判断d是否为标点符号：{0}", char.IsPunctuation(d));
            Console.WriteLine("IsSeparator判断e是否为分隔符：{0}", char.IsSeparator(e));
            Console.WriteLine("IsWhiteSpace判断f是否为空白：{0}", char.IsWhiteSpace(f));
        }
    }
}