c#文件流

流有很多种,文件流是一种.

FileMode是枚举类型

.Append 追加

.Create 创建或覆盖

.CreateNew 创建 相同则抛出异常

.Open 打开

.OpenOrCreate 有则打开无则创建

.Truncate 打开并截取成0字节

StreamReader写入中文

            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Write, FileShare.None);//创建文件流
            StreamWriter sw = new StreamWriter(fs,Encoding.GetEncoding("gb2312"));//支持中文

            sw.WriteLine("test");

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            FileStream fs = new FileStream(@"F:DotNetC#DotNet基础加强视频20110718 文件新建 文本文档.txt", FileMode.Open);//打开
            int bufferSize = 1024;//定义缓冲区大小
            byte[] buffer = new byte[bufferSize];
            int n;
            while ((n = fs.Read(buffer, 0, bufferSize))> 0)
            {
                //字节数组转换成字符串
                Console.WriteLine (Encoding.UTF8.GetString(buffer,0,n));//UTF8为文件编码类型
            }
            //关闭文件流
            fs.Close();

            Console.Read();
        }
    }
}

读取整个文件
            using (FileStream fs = File.OpenRead(@"F:DotNetC#DotNet基础加强视频20110718 文件新建 文本文档.txt")) 
            {
                using (StreamReader sr = new StreamReader(fs, Encoding.UTF8)) 
                {
                    Console.WriteLine(sr.ReadToEnd());
                }
            }
            Console.Read();

一行一行读取文件
            using (FileStream fs = File.OpenRead(@"F:DotNetC#DotNet基础加强视频20110718 文件新建 文本文档.txt")) 
            {
                using (StreamReader sr = new StreamReader(fs, Encoding.UTF8)) 
                {
                    string line;
                    while ((line = sr.ReadLine()) != null)
                    {
                        Console.WriteLine(line);
                    }
                }
            }
            Console.Read();

读取网页源代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Net;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            using (Stream str = wc.OpenRead("http://www.baidu.com")) 
            {
                using (StreamReader sr = new StreamReader(str, Encoding.UTF8)) 
                {
                    string line;
                    while ((line = sr.ReadLine()) != null) 
                    { 
                      Console.WriteLine(line);
                    }
                }
            }
            Console.Read();
        }
    }
}