统计一个目录下所有.cs文件的行数

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace 学习
{
    class 选择一个目录中所有项目
    {
        /// <summary>
        /// 统计当前目录和子目录的行数
        /// </summary>
        /// <param name="directory"></param>
        /// <returns></returns>
        public static int DirectoryCountLines(string directory)
        {
            int lineCount = 0;
            //统计当前目录的文件
            foreach(string file in Directory.GetFiles( directory,"*.cs"))
            {
                lineCount+=Countlines(file);
            }
            //统计子目录的文件
            foreach (string subFile in Directory.GetDirectories(directory))
            {
                lineCount += Countlines(subFile);
            }
            return lineCount;

        }
        /// <summary>
        /// 统计行数
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        public static int Countlines(string file)
        {
            string line = string.Empty;
            int lineCount = 0;
            FileStream Stream = new FileStream(file, FileMode.Open);
            StreamReader read = new StreamReader(Stream);
            line = read.ReadLine();//把第一行赋给line
            while(line.Trim()!=null)
            {
                lineCount++;
                line = read.ReadLine();
            }
            Stream.Close();
            read.Close();

            return lineCount; 
        }
    }
}