FileStream <object_name> = new FileStream(<file_name>, <FileMode Enumerator>, <FileAccess Enumerator>, <FileShare Enumerator>);

using System;
using System.IO;
namespace c.biancheng.net
{
    class Demo
    {
        static void Main(string[] args) 
        {
            FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite);
            for(int i = 0; i < 20; i++){
                file.WriteByte((byte)i);
            }
            file.Position = 0;
            for(int i = 0; i < 20; i++){
                Console.Write(file.ReadByte() + " ");
            }
            file.Close();
            Console.ReadKey();
        }
    }
}

using System;
using System.IO;
namespace c.biancheng.net
{
    class Demo
    {
        static void Main(string[] args) 
        {
            try{
                // 創(chuàng)建 StreamReader 類的對(duì)象
                StreamReader file = new StreamReader("test.txt");
                string line;
                // 從文件中讀取內(nèi)容
                while((line = file.ReadLine()) != null){
                    Console.WriteLine(line);
                }
            }catch(Exception e){
                // 展示出錯(cuò)信息
                Console.WriteLine("無(wú)法讀取文件");
                Console.WriteLine(e.Message);
            }
            Console.ReadKey();
        }
    }
}

using System;
using System.IO;
namespace c.biancheng.net
{
    class Demo
    {
        static void Main(string[] args) 
        {
            // 要寫(xiě)入文件中的數(shù)據(jù)
            string[] str = new string[]{
                "薪薪代碼",
                "你好",
                "C# 教程"
            };
            // 創(chuàng)建 StreamWriter 類的對(duì)象
            StreamWriter file = new StreamWriter("demo.txt");
            // 將數(shù)組中的數(shù)據(jù)寫(xiě)入文件
            foreach(string s in str){
                file.WriteLine(s);
            }
            file.Close();
            // 讀取文件中的內(nèi)容
            string line = "";
            StreamReader readfile = new StreamReader("demo.txt");
            while((line = readfile.ReadLine()) != null){
                Console.WriteLine(line);
            }
            readfile.Close();
            Console.ReadKey();
        }
    }
}

using System;
using System.IO;
namespace c.biancheng.net
{
    class Demo
    {
        static void Main(string[] args) 
        {
            BinaryWriter bw;
            BinaryReader br;
            int i = 520;
            double d = 3.14159;
            bool b = true;
            string s = "薪薪代碼";
            // 創(chuàng)建文件
            try{
                bw = new BinaryWriter(new FileStream("mydata", FileMode.Create));
            }catch (IOException e){
                Console.WriteLine(e.Message + "\n 文件創(chuàng)建失??！");
                return;
            }
            // 寫(xiě)入文件
            try{
                bw.Write(i);
                bw.Write(d);
                bw.Write(b);
                bw.Write(s);
            }catch (IOException e){
                Console.WriteLine(e.Message + "\n 文件寫(xiě)入失敗！");
            }
            bw.Close();
            // 讀取文件
            try{
                br = new BinaryReader(new FileStream("mydata", FileMode.Open));
            }catch (IOException e){
                Console.WriteLine(e.Message + "\n 文件打開(kāi)失??！");
                return;
            }
            try{
                i = br.ReadInt32();
                Console.WriteLine("Integer data: {0}", i);
                d = br.ReadDouble();
                Console.WriteLine("Double data: {0}", d);
                b = br.ReadBoolean();
                Console.WriteLine("Boolean data: {0}", b);
                s = br.ReadString();
                Console.WriteLine("String data: {0}", s);
            }catch (IOException e){
                Console.WriteLine(e.Message + "\n 文件讀取失?。?");
            }
            br.Close();
            Console.ReadKey();
        }
    }
}