list 快速操作字符串

1、 LinkedList的使用

https://www.cnblogs.com/ChengWenHao/p/CSharpLinkedList.html

private static void TestLinkList()
{
LinkedList<Person> linkListPerson = new LinkedList<Person>();
Person p = null;
for (int i = 1; i < 10; i++)
{
p = new Person($"程序员{i}", i + 18,i%5==1?"女":"男");
//添加
linkListPerson.AddLast(p);
//linkListPerson.AddFirst(p);
}

Console.WriteLine($"新增的总人数:{linkListPerson.Count}");
Console.WriteLine("-------------------------------------------------------------");

//遍历
LinkedListNode<Person> linkNodePerson = linkListPerson.First;
linkNodePerson.Value.SayHi();

while (linkNodePerson.Next!=null)
{
linkNodePerson = linkNodePerson.Next;
linkNodePerson.Value.SayHi();
}

Console.WriteLine("-------------------------------------------------------------");

//删除
while (linkNodePerson.Value != null && linkListPerson.Count > 0)
{
linkNodePerson = linkListPerson.Last;
Console.Write($"当前总人数：{linkListPerson.Count}, 即将移除：{linkNodePerson.Value.Name} --> ");
linkListPerson.RemoveLast();
Console.WriteLine($"移除后总人数：{linkListPerson.Count}");
}

}

2、

 使用List泛型读取和保存文本文件

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

using System.Management;//添加引用
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //测试代码: 
            test mgr = new test();
            mgr.WriteListToTextFile(mgr.GetUserNames(), @"c:\test.txt"); //测试生成新的Txt文件
            List<string> list = mgr.ReadTextFileToList(@"C:\test.txt");//记取字符串 
            foreach (string s in list) Console.WriteLine(s); //显示出来′ 
            Console.ReadKey(); //按′任一键关闭Console 
         
            /*
             * 结果：

             *  JUQI\ASPNET
                JUQI\capable
                JUQI\Guest
                JUQI\itd0300166
                JUQI\IUSR_PLSH166
                JUQI\IWAM_PLSH166
                JUQI\SUPPORT_388945a0
             * 
             * */

        }
    }
        public class test
        {

            /// <summary>
            /// 获取本机上的用户帐户

            /// </summary>
            /// <param name="domainName"></param>
            /// <returns></returns>
            public  List<String> GetUserNames()
            {
                ManagementClass mcs = new ManagementClass("Win32_UserAccount");
                ManagementObjectCollection moc = mcs.GetInstances();
                List<String> lstNames = new List<string>();
                foreach (ManagementObject mo in moc)
                {
                    lstNames.Add(Environment.UserDomainName + "\\" + mo.GetPropertyValue("Name").ToString());
                    //domainName = mo.GetPropertyValue("Domain").ToString();
                }
                return lstNames;
            }


            //将List转换为TXT文件
            public void WriteListToTextFile(List<string> list, string txtFile)
            {
                //创建一个文件流，用以写入或者创建一个StreamWriter 
                FileStream fs = new FileStream(txtFile, FileMode.OpenOrCreate, FileAccess.Write);
                StreamWriter sw = new StreamWriter(fs);
                sw.Flush();
                // 使用StreamWriter来往文件中写入内容 
                sw.BaseStream.Seek(0, SeekOrigin.Begin);
                for (int i = 0; i < list.Count; i++) sw.WriteLine(list[i]);
                //关闭此文件t 
                sw.Flush();
                sw.Close();
                fs.Close();
            }


            //读取文本文件转换为List 
            public List<string> ReadTextFileToList(string fileName)
            {
                FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                List<string> list = new List<string>();
                StreamReader sr = new StreamReader(fs);
                //使用StreamReader类来读取文件 
                sr.BaseStream.Seek(0, SeekOrigin.Begin);
                // 从数据流中读取每一行，直到文件的最后一行
                string tmp = sr.ReadLine();
                while (tmp != null)
                {
                    list.Add(tmp);
                    tmp = sr.ReadLine();
                }
                //关闭此StreamReader对象 
                sr.Close();
                fs.Close();
                return list;
            }
        }

    }