C#学习

1.B站丑萌气质狗
- C#的循环-判断
- 泛型
- 错误处理
- 面向对象
- static的使用
- 定义showInfo类和Hero类
在这里插入图片描述然后在该解决方案add新建一个类库，点击rebuild，会在bin文件夹下生成.dll文件 ![在这里插入图片描述](https://i-blog.csdnimg.cn/direct/df960c0eefc04f8db1b3ba6488b01c5d.png) 现在解决方案里有ConsoleAppFrameWork和ClassLibrary两个项目,需要把类库中的.dll文件引入进来，然后会在ConsoleAppFrameWork的References下面看到。 ![在这里插入图片描述](https://i-blog.csdnimg.cn/direct/ec1945fb0af147b7984ba1f3b8387761.png) ![在这里插入图片描述](https://i-blog.csdnimg.cn/direct/4eaf405189824917b6a429b1588c86b4.png)
- 文件读写

1.B站丑萌气质狗

视频链接

C#的循环-判断

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

namespace ConsoleAppFramework
{
    internal class Program
    {
        static void Main(string[] args)
        {
            for (int i=0; i<=2;i++) {
                GetUserInfo();//第一个用户

            }
           
            Console.ReadKey();
        }
        static string ChangeData(String name1) {
            if (name1 == "张三")
            {
                Console.WriteLine("你输入的是张三");
                name1 = "法外狂徒张三";
            }
            else if (name1 == "李四")
            {
                Console.WriteLine("你输入的是李四");
                name1 = "无情铁手李四";
            }
            else if (name1 == "王五")
            {
                Console.WriteLine("你输入的是王五");
                name1 = "柔情姐姐王五";
            }
            else {
                Console.WriteLine("你输入的不正确，无法修改");
            }
            return name1;
        }
        public static void GetUserInfo() {
            Console.WriteLine("这是我的第一个程序");
            Console.WriteLine("请输入你的故乡");
            string home = Console.ReadLine();
            Console.WriteLine("请输入你的名字");
            string name = Console.ReadLine();
            name=ChangeData(name);
            Console.WriteLine("请输入你的年龄");
            string age = Console.ReadLine();
            Console.WriteLine("请输入你的爱好");
            string hobby = Console.ReadLine();
            Console.WriteLine("");
            Console.WriteLine($"故乡:{home}  名字:{name}  年龄:{age}  爱好:{hobby}");
        }
    }
}

泛型

功能：查找泛型集合中有几个【张三】

      static void Main(string[] args)
      {

          //泛型集合
          List<string> names = new List<string>();
          names.Add("张三");
          names.Add("李四");
          names.Add("王五");
          int num = 0;
          for (int i = 0; i < names.Count; i++)
          {
              if (names[i] == "张三")
              {
                  num = num + 1;
              }
          }
          Console.WriteLine(num);

          Console.ReadKey();
      }

错误处理

（1）不循环的错误处理

      static void Main(string[] args)
      {

          int age = 0;
          Console.WriteLine("请输入年龄：");
          string input = Console.ReadLine();
          try {
              age = int.Parse(input); 
          }
          catch { 
              Console.WriteLine("请输入正确的年龄（数字字符串）！");
              return;//捕获到错误后直接return,要不然后面的代码还会执行，错误的打印出10
          }
          age += 10;
          Console.WriteLine("你的年龄是："+age.ToString());
          Console.ReadKey();
          
      }

（2）循环的错误处理，直到控制台输入正确的年龄，跳出循环

        static void Main(string[] args)
        {

            int age = 0;

            bool flag = true;
            for (; flag; ) {//直到输入正确的年龄，跳出循环
                Console.WriteLine("请输入年龄：");
                string input = Console.ReadLine();
                try
                {
                    age = int.Parse(input);
                    flag= false;

                }
                catch
                {
                    Console.WriteLine("请输入正确的年龄（数字字符串）！");
                    flag = true;//出现年龄错误时一直进入循环，直到输入正确的年龄
                }
                age += 10;
               // Console.WriteLine("你的年龄是：" + age.ToString());及时出错也会进入这一步，年龄是0+10=10
            }
            Console.WriteLine("请输入姓名！");
            string name = Console.ReadLine();
            Console.WriteLine("请输入家乡！");
            string hometown = Console.ReadLine();
            Console.WriteLine($"故乡:{hometown}  名字:{name}  十年后的年龄:{age}");
            Console.ReadKey();


        }

面向对象

基本属性

    internal class Program
    {
        static void Main(string[] args)
        {   
            Console.WriteLine("锄禾日当午！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("汗滴禾想吐！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("谁知盘中餐！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("粒粒皆辛苦！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("这位农民工是谁？");
            string name=Console.ReadLine();
            Console.WriteLine("这位农民原来是--->" + name);
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            //这位农民的基本信息，技能及伤害
            string sex = "男";
            int age = 22;
            int high = 180;
            int shanghai = 100;
            int xueliang = 100;
            string jineng1 = "飞檐走壁";
            int jinneg1shanghai = 20;
            string jineng2 = "飞沙走石";
            int jinneg2shanghai = 30;
            Console.WriteLine("性别："+sex);
            Console.WriteLine("年龄："+age);
            Console.WriteLine("身高："+high);
            Console.WriteLine("基础伤害："+shanghai);
            Console.WriteLine("基础血量："+xueliang);
            Console.WriteLine("技能1伤害："+jinneg1shanghai);
            Console.WriteLine("技能2伤害："+jinneg2shanghai);
            Console.ReadKey();
            // Console.WriteLine("基础伤害：");

            Console.WriteLine("此时远处传来一个粗犷的声音");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            Console.WriteLine("走进一看是一位警察");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            Console.WriteLine("这个警察的名称");
            string jingchaname = Console.ReadLine();
            Console.WriteLine("这位警察原来是--->" + jingchaname);
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();

            //这位警察的基本信息，技能及伤害
            string sex2 = "男";
            int age2 = 22;
            int high2 = 180;
            int shanghai2 = 100;
            int xueliang2 = 100;
            string jineng11 = "跆拳道";
            int jinneg11shanghai = 20;
            string jineng22 = "狙击手";
            int jinneg22shanghai = 30;
            Console.WriteLine("性别：" + sex2);
            Console.WriteLine("年龄：" + age2);
            Console.WriteLine("身高：" + high2);
            Console.WriteLine("基础伤害：" + shanghai2);
            Console.WriteLine("基础血量：" + xueliang2);
            Console.WriteLine("技能1伤害：" + jinneg11shanghai);
            Console.WriteLine("技能2伤害：" + jinneg22shanghai);
            Console.ReadKey();



        }

（2）封装类属性后创键的对象

class Hero {
    public string name = "";
    public string sex = "男";
    public int age = 22;
    public int high = 180;
    public int shanghai = 100;
    public int xueliang = 100;
    public string jineng1 = "飞檐走壁";
    public int jinneg1shanghai = 20;
    public string jineng2 = "飞沙走石";
    public int jinneg2shanghai = 30;
}

internal class Program
{
    static void Main(string[] args)
    {   
        Console.WriteLine("锄禾日当午！");
        Console.WriteLine("（请按任意键继续）！");
        Console.ReadKey();//代码暂停，输入任意键继续
        Console.WriteLine("汗滴禾想吐！");
        Console.WriteLine("（请按任意键继续）！");
        Console.ReadKey();//代码暂停，输入任意键继续
        Console.WriteLine("谁知盘中餐！");
        Console.WriteLine("（请按任意键继续）！");
        Console.ReadKey();//代码暂停，输入任意键继续
        Console.WriteLine("粒粒皆辛苦！");
        Console.WriteLine("（请按任意键继续）！");
        Console.ReadKey();//代码暂停，输入任意键继续
        Console.WriteLine("这位农民工是谁？");

        Hero hr1=new Hero();
        hr1.name =Console.ReadLine();
        Console.WriteLine("这位农民原来是--->" + hr1.name);
        Console.WriteLine("（请按任意键继续）！");
        Console.ReadKey();
        //这位农民的基本信息，技能及伤害
        

        hr1.sex = "男";
        hr1.age = 22;
        hr1.high = 180;
        hr1.shanghai = 100;
        hr1.xueliang = 100;
        hr1.jineng1 = "飞檐走壁";
        hr1.jinneg1shanghai = 20;
        hr1.jineng2 = "飞沙走石";
        hr1.jinneg2shanghai = 30;
        Console.WriteLine("性别："+ hr1.sex);
        Console.WriteLine("年龄："+ hr1.age);
        Console.WriteLine("身高："+ hr1.high);
        Console.WriteLine("基础伤害："+ hr1.shanghai);
        Console.WriteLine("基础血量："+ hr1.xueliang);
        Console.WriteLine("技能1伤害："+ hr1.jinneg1shanghai);
        Console.WriteLine("技能2伤害："+ hr1.jinneg2shanghai);
        Console.ReadKey();
        // Console.WriteLine("基础伤害：");

        Console.WriteLine("此时远处传来一个粗犷的声音");
        Console.WriteLine("（请按任意键继续）！");
        Console.ReadKey();
        Console.WriteLine("走进一看是一位警察");
        Console.WriteLine("（请按任意键继续）！");
        Console.ReadKey();
        Console.WriteLine("这个警察的名称");

        Hero hr2 = new Hero();
        hr2.name = Console.ReadLine();
        Console.WriteLine("这位警察原来是--->" + hr2.name);
        Console.WriteLine("（请按任意键继续）！");
        Console.ReadKey();

        //这位警察的基本信息，技能及伤害
        hr2.sex= "男";
        hr2.age = 22;
        hr2.high = 180;
        hr2.shanghai = 100;
        hr2.xueliang= 100;
        hr2.jineng1 = "跆拳道";
        hr2.jinneg1shanghai = 20;
        hr2.jineng2 = "狙击手";
        hr2.jinneg2shanghai = 30;
        Console.WriteLine("性别：" + hr2.sex);
        Console.WriteLine("年龄：" + hr2.age);
        Console.WriteLine("身高：" + hr2.high);
        Console.WriteLine("基础伤害：" + hr2.shanghai);
        Console.WriteLine("基础血量：" + hr2.xueliang);
        Console.WriteLine("技能1伤害：" + hr2.jinneg1shanghai);
        Console.WriteLine("技能2伤害：" + hr2.jinneg2shanghai);
        Console.ReadKey();



    }

（3）封装到hero类中，并定义showInfo方法

    class Hero {
        public string name = "";
        public string sex = "男";
        public int age = 22;
        public int high = 180;
        public int shanghai = 100;
        public int xueliang = 100;
        public string jineng1 = "飞檐走壁";
        public int jinneg1shanghai = 20;
        public string jineng2 = "飞沙走石";
        public int jinneg2shanghai = 30;

        public void showInfo(){
        Console.WriteLine("性别：" + sex);
        Console.WriteLine("年龄：" + age);
        Console.WriteLine("身高：" + high);
        Console.WriteLine("基础伤害：" + shanghai);
        Console.WriteLine("基础血量：" + xueliang);
        Console.WriteLine("技能1伤害：" + jinneg1shanghai);
        Console.WriteLine("技能2伤害：" + jinneg2shanghai);
        }
    }

    internal class Program
    {
        static void Main(string[] args)
        {   
            Console.WriteLine("锄禾日当午！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("汗滴禾想吐！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("谁知盘中餐！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("粒粒皆辛苦！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("这位农民工是谁？");

            Hero hr1=new Hero();
            hr1.name =Console.ReadLine();
            Console.WriteLine("这位农民原来是--->" + hr1.name);
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            //这位农民的基本信息，技能及伤害
            

            hr1.sex = "男";
            hr1.age = 22;
            hr1.high = 180;
            hr1.shanghai = 100;
            hr1.xueliang = 100;
            hr1.jineng1 = "飞檐走壁";
            hr1.jinneg1shanghai = 20;
            hr1.jineng2 = "飞沙走石";
            hr1.jinneg2shanghai = 30;
            //Console.WriteLine("性别：" + hr1.sex);
            //Console.WriteLine("年龄：" + hr1.age);
            //Console.WriteLine("身高：" + hr1.high);
            //Console.WriteLine("基础伤害：" + hr1.shanghai);
            //Console.WriteLine("基础血量：" + hr1.xueliang);
            //Console.WriteLine("技能1伤害：" + hr1.jinneg1shanghai);
            //Console.WriteLine("技能2伤害：" + hr1.jinneg2shanghai);
            hr1.showInfo();
            Console.ReadKey();
            // Console.WriteLine("基础伤害：");

            Console.WriteLine("此时远处传来一个粗犷的声音");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            Console.WriteLine("走进一看是一位警察");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            Console.WriteLine("这个警察的名称");

            Hero hr2 = new Hero();
            hr2.name = Console.ReadLine();
            Console.WriteLine("这位警察原来是--->" + hr2.name);
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();

            //这位警察的基本信息，技能及伤害
            hr2.sex= "男";
            hr2.age = 22;
            hr2.high = 180;
            hr2.shanghai = 100;
            hr2.xueliang= 100;
            hr2.jineng1 = "跆拳道";
            hr2.jinneg1shanghai = 20;
            hr2.jineng2 = "狙击手";
            hr2.jinneg2shanghai = 30;
            //Console.WriteLine("性别：" + hr2.sex);
            //Console.WriteLine("年龄：" + hr2.age);
            //Console.WriteLine("身高：" + hr2.high);
            //Console.WriteLine("基础伤害：" + hr2.shanghai);
            //Console.WriteLine("基础血量：" + hr2.xueliang);
            //Console.WriteLine("技能1伤害：" + hr2.jinneg1shanghai);
            //Console.WriteLine("技能2伤害：" + hr2.jinneg2shanghai);
            hr2.showInfo();
            Console.ReadKey();



        }

static的使用

static可以直接使用，不用对类实例化。

定义showInfo类和Hero类

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

namespace ConsoleAppFramework
{
    class Hero {
        public string name = "";
        public string sex = "男";
        public int age = 22;
        public int high = 180;
        public int shanghai = 100;
        public int xueliang = 100;
        public string jineng1 = "飞檐走壁";
        public int jinneg1shanghai = 20;
        public string jineng2 = "飞沙走石";
        public int jinneg2shanghai = 30;

       
    }
    class ShowInfo{
        public static void showInfo(Hero hero)
        {
            Console.WriteLine("性别：" + hero.sex);
            Console.WriteLine("年龄：" + hero.age);
            Console.WriteLine("身高：" + hero.high);
            Console.WriteLine("基础伤害：" + hero.shanghai);
            Console.WriteLine("基础血量：" + hero.xueliang);
            Console.WriteLine("技能1伤害：" + hero.jinneg1shanghai);
            Console.WriteLine("技能2伤害：" + hero.jinneg2shanghai);
        }
    }

    internal class Program
    {
        static void Main(string[] args)
        {   
            Console.WriteLine("锄禾日当午！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("汗滴禾想吐！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("谁知盘中餐！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("粒粒皆辛苦！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("这位农民工是谁？");

            Hero hr1=new Hero();
            hr1.name =Console.ReadLine();
            Console.WriteLine("这位农民原来是--->" + hr1.name);
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            //这位农民的基本信息，技能及伤害
            

            hr1.sex = "男";
            hr1.age = 22;
            hr1.high = 180;
            hr1.shanghai = 100;
            hr1.xueliang = 100;
            hr1.jineng1 = "飞檐走壁";
            hr1.jinneg1shanghai = 20;
            hr1.jineng2 = "飞沙走石";
            hr1.jinneg2shanghai = 30;

            ShowInfo.showInfo(hr1);//不需要实例化ShowInfo类
            Console.ReadKey();

            Console.WriteLine("此时远处传来一个粗犷的声音");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            Console.WriteLine("走进一看是一位警察");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            Console.WriteLine("这个警察的名称");

            Hero hr2 = new Hero();
            hr2.name = Console.ReadLine();
            Console.WriteLine("这位警察原来是--->" + hr2.name);
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();

            //这位警察的基本信息，技能及伤害
            hr2.sex= "男";
            hr2.age = 22;
            hr2.high = 180;
            hr2.shanghai = 100;
            hr2.xueliang= 100;
            hr2.jineng1 = "跆拳道";
            hr2.jinneg1shanghai = 20;
            hr2.jineng2 = "狙击手";
            hr2.jinneg2shanghai = 30;
            ShowInfo.showInfo(hr1);//不需要实例化ShowInfo类
            Console.ReadKey();
        }
    }
}

把类抽离出来，放到新的文件里【新建了Hero和ShowInfo文件夹】
在这里插入图片描述
program.cs

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

namespace ConsoleAppFramework
{
    internal class Program
    {
        static void Main(string[] args)
        {   
            Console.WriteLine("锄禾日当午！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("汗滴禾想吐！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("谁知盘中餐！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("粒粒皆辛苦！");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();//代码暂停，输入任意键继续
            Console.WriteLine("这位农民工是谁？");

            Hero hr1=new Hero();
            hr1.name =Console.ReadLine();
            Console.WriteLine("这位农民原来是--->" + hr1.name);
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            //这位农民的基本信息，技能及伤害
            

            hr1.sex = "男";
            hr1.age = 22;
            hr1.high = 180;
            hr1.shanghai = 100;
            hr1.xueliang = 100;
            hr1.jineng1 = "飞檐走壁";
            hr1.jinneg1shanghai = 20;
            hr1.jineng2 = "飞沙走石";
            hr1.jinneg2shanghai = 30;

            ShowInfo.showInfo(hr1);//不需要实例化ShowInfo类
            Console.ReadKey();

            Console.WriteLine("此时远处传来一个粗犷的声音");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            Console.WriteLine("走进一看是一位警察");
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();
            Console.WriteLine("这个警察的名称");

            Hero hr2 = new Hero();
            hr2.name = Console.ReadLine();
            Console.WriteLine("这位警察原来是--->" + hr2.name);
            Console.WriteLine("（请按任意键继续）！");
            Console.ReadKey();

            //这位警察的基本信息，技能及伤害
            hr2.sex= "男";
            hr2.age = 22;
            hr2.high = 180;
            hr2.shanghai = 100;
            hr2.xueliang= 100;
            hr2.jineng1 = "跆拳道";
            hr2.jinneg1shanghai = 20;
            hr2.jineng2 = "狙击手";
            hr2.jinneg2shanghai = 30;
            ShowInfo.showInfo(hr1);//不需要实例化ShowInfo类
            Console.ReadKey();



        }
      

        static string ChangeData(String name1) {
            if (name1 == "张三")
            {
                Console.WriteLine("你输入的是张三");
                name1 = "法外狂徒张三";
            }
            else if (name1 == "李四")
            {
                Console.WriteLine("你输入的是李四");
                name1 = "无情铁手李四";
            }
            else if (name1 == "王五")
            {
                Console.WriteLine("你输入的是王五");
                name1 = "柔情姐姐王五";
            }
            else {
                Console.WriteLine("你输入的不正确，无法修改");
            }
            return name1;
        }
        public static void GetUserInfo() {
            Console.WriteLine("这是我的第一个程序");
            Console.WriteLine("请输入你的故乡");
            string home = Console.ReadLine();
            Console.WriteLine("请输入你的名字");
            string name = Console.ReadLine();
            name=ChangeData(name);
            Console.WriteLine("请输入你的年龄");
            string age = Console.ReadLine();
            Console.WriteLine("请输入你的爱好");
            string hobby = Console.ReadLine();
            Console.WriteLine("");
            Console.WriteLine($"故乡:{home}  名字:{name}  年龄:{age}  爱好:{hobby}");
        }
    }
}

ShowInfo.cs

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

namespace MyShowInfo
{

        class ShowInfo
        {
            public static void showInfo(Hero hero)
            {
                Console.WriteLine("性别：" + hero.sex);
                Console.WriteLine("年龄：" + hero.age);
                Console.WriteLine("身高：" + hero.high);
                Console.WriteLine("基础伤害：" + hero.shanghai);
                Console.WriteLine("基础血量：" + hero.xueliang);
                Console.WriteLine("技能1伤害：" + hero.jinneg1shanghai);
                Console.WriteLine("技能2伤害：" + hero.jinneg2shanghai);
            }
        }
    }

Hero.cs

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

namespace ConsoleAppFramework
{
    class Hero
    {
        public string name = "";
        public string sex = "男";
        public int age = 22;
        public int high = 180;
        public int shanghai = 100;
        public int xueliang = 100;
        public string jineng1 = "飞檐走壁";
        public int jinneg1shanghai = 20;
        public string jineng2 = "飞沙走石";
        public int jinneg2shanghai = 30;


    }

}

然后在该解决方案add新建一个类库，点击rebuild，会在bin文件夹下生成.dll文件

现在解决方案里有ConsoleAppFrameWork和ClassLibrary两个项目,需要把类库中的.dll文件引入进来，然后会在ConsoleAppFrameWork的References下面看到。

重新启动,将ConsoleAppFrameWork设为启动项，再次执行时多了两个文件classLibrary.cll和pdb文件，【这个是结果】
可能处出现的问题：哪些文件中使用到新建的类库，就在哪些文件里using 类库【类库记得rebuild，.dll文件】
在这里插入图片描述

文件读写

删除一个文件
ChangFile/programmer.cs

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

namespace ChangeFile
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string path = "C:/Users/sesa779614/learning";
            //获取路径下的所有文件
            DirectoryInfo root=new DirectoryInfo(path);
            FileInfo[] files= root.GetFiles();
          
            List< FileInfo > filesInfo = files.ToList();

            for (int i=0; i<filesInfo.Count;i++) { 
                FileInfo file = filesInfo[i];
                if (file.Name== "Async in C# 5.0.pdf") { 
                    System.IO.File.Delete(file.FullName);
                    Console.WriteLine("Async in C# 5.0.pdf已经被删除了");
                }
               // Console.WriteLine(file.FullName);
               // Console.WriteLine(file.Name);
            }

            //string[] files = Directory.GetFiles(path, "*", SearchOption.AllDirectories);

            //foreach (string file in files)
            //{
            //    Console.WriteLine(file);
            //}
            Console.ReadKey();
        }
    }
}

文件改名

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

namespace ChangeFile
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string path = "C:/Users/sesa779614/learning";
            //获取路径下的所有文件
            DirectoryInfo root=new DirectoryInfo(path);
            FileInfo[] files= root.GetFiles();
          
            List< FileInfo > filesInfo = files.ToList();

            for (int i=0; i<filesInfo.Count;i++) { 
                FileInfo file = filesInfo[i];
                string filename = file.Name;

                if (filename== "Async in C# 5.0.pdf") { 
                    System.IO.File.Delete(file.FullName);
                    Console.WriteLine("Async in C# 5.0.pdf已经被删除了");
                }
                if (filename.Contains("C#")) {
                    //如果文件名中包含C#,就给文件改名称
                    string srgFileName=filesInfo[i].FullName;
                    string destFileName=filesInfo[i].Directory.FullName+"/gaigai"+ filesInfo[i].Extension;//文件夹路径+新的文件名
                    File.Move(srgFileName,destFileName);

                }
                Console.WriteLine(filename);
                Console.WriteLine(filename.Contains("C#"));
            }

            //string[] files = Directory.GetFiles(path, "*", SearchOption.AllDirectories);

            //foreach (string file in files)
            //{
            //    Console.WriteLine(file);
            //}
            Console.ReadKey();

        
        
        }
    }
}