WeiBlog

using System;
using System.IO;

namespace FileClass_Read_and_Wright
{
class Program
{
static void Main(string[] args)
{
/string[] strarray = File.ReadAllLines("TextFile1.txt");//读取文件，把每一行文本文件读取成一个字符串，
//最后主城一个字符串数组
foreach (var s in strarray )
{
Console.WriteLine(s);
}/

        /*string s = File.ReadAllText("TextFile1.txt");
        Console.WriteLine(s);*/

        byte[] byteArray = File.ReadAllBytes("20191103200554.jpg");
        foreach (var b in byteArray)
        {
            Console.Write(b);
        }

        /*File.WriteAllText("TextFile2.txt", "WEI");

        File.WriteAllLines("TextFile3.txt", new string[] { "wei", "zzz" });*/

        //读取文件二进制数据
        //byte[] data = File.ReadAllBytes("20191103200554.jpg");
        //写入文件二进制数据（复制）
        //File.WriteAllBytes("1.png", data);

    }
}

}
class Program
{
static void Main(string[] args)
{
//Path类与String类相似
string path = @"C:\Users\qweasd\Desktop\NewC\NNN\GaO4\CYG1114\2CYG\1.txt";
/int index = path.LastIndexOf("\");
string s = path.Substring(index + 1);
Console.WriteLine(s);/
//获取文件名
Console.WriteLine( Path.GetFileName(path));
//获取文件名不包含扩展名
Console.WriteLine(Path.GetFileNameWithoutExtension(path));
//获取文件的扩展名
Console.WriteLine(Path.GetExtension(path));
//获取文件所在文件夹的名称
Console.WriteLine(Path.GetDirectoryName(path));
//绝对路径
Console.WriteLine(Path.GetFullPath(path));
//合并路径
Console.WriteLine(Path.Combine(@"c\a","b.txt"));

        //File类
        //创建文件
        /*File.Create("2.txt");
        Console.WriteLine("Create f");
        Console.ReadKey();*/
        //删除文件
        //File.Delete(@"D:\715\CSharp\2.txt");

        //字符串转字节数组
        byte[] bit = Encoding.Default.GetBytes(path);
        //字节数组转字符串
        string str = Encoding.Default.GetString(bit);

        //写入
        string ss  = "WWWWWWWWWCXRCMCOTXNOMX";
        byte[] dt = Encoding.Default.GetBytes(ss);
        File.WriteAllBytes("1.txt", dt);
        //由字符串数组逐行写入
        File.WriteAllLines("1.txt", new string[] { "weqr", "fsdf", "rfsf" });
        File.WriteAllText("1.txt", "decwdsq");
        //追加写入
        File.AppendAllText("1.txt", "---wei");

        //读取
        byte[] b = File.ReadAllBytes("1.txt");
        //相对路径：D:\715\CSharp\文件类\bin\Debug\netcoreapp3.0-程序调试文件夹下
        Console.WriteLine(Encoding.UTF8.GetString(b));
        File.ReadAllLines(@"D:\715\CSharp\1.txt");//返回字符串数组
        File.ReadAllText(@"D:\715\CSharp\1.txt");//返回一个字符串

        //FileStream类

        //读取数据
        /*FileStream fil = new FileStream(@"D:\715\CSharp\1.txt", FileMode.OpenOrCreate, FileAccess.Read);
        //参数-FileStream（路径，对文件的操作，对文件里面的数据进行的操作）
        byte[] buffer = new byte[1025 * 1024 * 5];
        //返回读取到的有效字节数
        int r = fil.Read(buffer, 0, buffer.Length);//读取长度
        string s = Encoding.Default.GetString(buffer, 0, r);
        fil.Close();//关闭流
        fil.Dispose();//释放占用资源
        Console.WriteLine(s);*/

        //写入数据
        //将文件流对象写入using{}中，系统会自动释放所占用的资源
        /*using (FileStream fileWrite = new FileStream(@"D:\715\CSharp\1.txt", FileMode.Create, FileAccess.Write))
        {
            string date = "Date Save";
            byte[] bufferW = Encoding.Default.GetBytes(date);
            fileWrite.Write(bufferW, 0, bufferW.Length);
        }*/

        string soucre = @"C:\Users\qweasd\Desktop\SAVE.png";
        string target = @"D:\715\CSharp\new.png";
        CoppyFile(soucre, target);
        Console.WriteLine("复制成功");
        Console.ReadLine();
        
        //StreamReader & StreamWriter
        //文本文件操作
        //读取
        using (StreamReader sr = new StreamReader(@"D:\715\CSharp\1.txt"))
        {
            while (!sr.EndOfStream)
            {
                Console.WriteLine(sr.ReadLine());
            }
        }
        //写入
        using (StreamWriter sw = new StreamWriter (@"D:\715\CSharp\1.txt",true))//bool是否追加文本
        {
            sw.Write("weiforzz");
        }


    }
    public static void CoppyFile(string soucre,string target)
    {
        //创建一个读取流
        using (FileStream fsRead = new FileStream(soucre, FileMode.Open, FileAccess.Read))
        {
            //创建一个写入流
            using (FileStream fsWrite = new FileStream (target ,FileMode.OpenOrCreate,FileAccess.Write))
            {
                byte[] buffer = new byte[1024 * 1024 * 5];

                while (true)
                {
                    int r = fsRead.Read(buffer, 0, buffer.Length);
                    if (r == 0)
                        break;
                    fsWrite.Write(buffer, 0, r);
                }
                
            }
        }
    }
}

}