在接受用户输入后，我需要返回c#中的单词数。

using System;

public class WordCounter
{
    public static int CountWords(string input)
    {
        string[] words = input.Split(new char[] { ' ', ',', '.', ';', '!', '?' }, StringSplitOptions.RemoveEmptyEntries);
        int count = 0;
        
        foreach (string word in words)
        {
            if (IsWord(word))
            {
                count++;
            }
        }
        
        return count;
    }
    
    private static bool IsWord(string word)
    {
        foreach (char c in word)
        {
            if (!Char.IsLetter(c))
            {
                return false;
            }
        }
        
        return true;
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine("请输入一段文本：");
        string input = Console.ReadLine();
        
        int wordCount = WordCounter.CountWords(input);
        Console.WriteLine("单词数：" + wordCount);
    }
}