如何在c#.net中计算数组列表项中的字符串

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        List<string> stringList = new List<string> { "123", "456", "789" };

        // 计算字符串列表项的长度总和
        int totalLength = stringList.Sum(s => s.Length);

        // 计算字符串列表项中包含特定字符的数量
        char targetChar = '5';
        int charCount = stringList.Sum(s => s.Count(c => c == targetChar));

        Console.WriteLine("字符串列表项的长度总和为：" + totalLength);
        Console.WriteLine("字符串列表项中包含字符 " + targetChar + " 的数量为：" + charCount);
    }
}