C# 文本文件和二进制文件读写

using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace 文件处理
{
    class Program
    {
        // 文本
        static void ReadFromText_ByStreamReader_line(string fileName)
        {
            StreamReader srFile = new StreamReader(fileName,true);
            string line = string.Empty;
            try
            {
                while ((line = srFile.ReadLine()) != null)
                {
                    Console.WriteLine(line);
                }
            }
            catch(Exception e)
            {
                Console.WriteLine("The file could not be read:");
                Console.WriteLine(e.Message);
            }
            srFile.Close();
        }

        static void ReadFromText_ByStreamReader_char(string fileName)
        {            
            char ch;
            try
            {
                // 创建一个 StreamReader 的实例来读取文件 
                // using 语句也能关闭 StreamReader
                using (StreamReader srFile = new StreamReader(fileName, true))
                {
                    while (srFile.Peek()> -1)
                    {
                        ch =  (char) srFile.Read();                      
                        Console.WriteLine(ch);
                       
                    }
                }    
            }
            catch (Exception e)
            {
                Console.WriteLine("The file could not be read:");
                Console.WriteLine(e.Message);
            }
        }
        static void WriteToText_ByStreamWriter(string fileName)
        {
            StreamWriter swFile = new StreamWriter(fileName);//如果增加bool值表示是不是增加
            swFile.WriteLine("hello world");
            swFile.Close();
        }

        // 二进制
        //转换string->byte格式 等效于 byte[] bb = Encoding.UTF8.GetBytes(ss);
        public static byte[] StrToByte(string strs)
        {
            try
            {
                byte[] returnBytes = new byte[strs.Length];
                for(int i = 0; i < returnBytes.Length; i++)
                {
                    returnBytes[i] = Convert.ToByte(strs[i]);
                }
                return returnBytes;
            }catch(Exception ex)
            {
                Console.WriteLine(ex.Message);
                return null;
            }
        }
        // Byte->char[]->string，等效于string s = Encoding.UTF8.GetString(bb);
        public static string ByteToCharToString(byte[] b)
        {
            char[] c = new char[b.Length];
            for(int i = 0; i < c.Length; i++)
            {
                c[i] = (char)b[i];
            }
            return new string(c);
        }

        static void ReadFromText_ByBinary_ByteToString(string fileName)
        {
            FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
            BinaryReader bw = new BinaryReader(fs);
            try
            {
                byte[] b = bw.ReadBytes(1024);
                String s = System.Text.Encoding.UTF8.GetString(b);
                // String s = ByteToCharToString(b);
                Console.WriteLine(s);
            }
            catch (EndOfStreamException e)
            {
                Console.WriteLine(e.Message);
                Console.WriteLine("已经读到末尾");
            }
            finally
            {
                bw.Close();
                fs.Close();
            }

        }

        static void WriteToText_ByBinary_StringToByte(string fileName)
        {
            FileStream fs = null;
            BinaryWriter bw = null;
            try
            {
                fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);
                 bw = new BinaryWriter(fs);
                Console.WriteLine("输入一行字符串");
                String temp = Console.ReadLine();
                // byte[] buffer = StrToByte(temp);
                byte[] buffer = System.Text.Encoding.UTF8.GetBytes(temp);
                if (buffer == null)
                {
                    Console.WriteLine("解析失败");
                    return ;
                }
                bw.Write(buffer);
               
            }catch(Exception e)
            {
                Console.WriteLine(e.Message);
            }
            finally
            {
                bw.Close();
                fs.Close();
            }
        }

        static void WriteToText_ByBinary_Object(string fileName)
        {
            FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);
            BinaryFormatter bf = new BinaryFormatter();
            MyData myData = new MyData();
            Console.WriteLine("Int:");
            myData.first = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Double:");
            myData.second = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("String:");
            myData.third = Console.ReadLine();
            bf.Serialize(fs, myData);
            fs.Close();
        }

        static void ReadFromText_ByBinary_Object(string fileName)
        {
         
            MyData myData = new MyData();
            FileStream fileStream = new FileStream(fileName,
                                        FileMode.Open,
                                        FileAccess.Read);
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            myData = (MyData)binaryFormatter.Deserialize(fileStream);
            Console.WriteLine(myData.first);
            Console.WriteLine(myData.second);
            Console.WriteLine(myData.third);
            fileStream.Close();
        }
        static void Main(string[] args)
        {
            string fileName = @"C:\Users\Lenovo\Desktop\hello.dat";
           // WriteToText_ByBinary_StringToByte(fileName);
            ReadFromText_ByBinary_ByteToString(fileName);
        }
    }

    [Serializable]
    class MyData
    {
        public int first;
        public double second;
        public string third;
    }

}

相关知识：

string 转换成 Char[]
　　string ss = "abcdefg";
　　char[] cc = ss.ToCharArray();

Char[] 转换成string
　　string s = new string(cc);

byte[] 与 string 之间的转换
　　byte[] bb = Encoding.UTF8.GetBytes(ss);
　　string s = Encoding.UTF8.GetString(bb);

byte[] 与 char[] 之间的转换

       byte[] bb;

       char[] cc = Encoding.ASCII.GetChars(bb);

        byte[] bb = Encoding.ASCII.GetBytes(

cc);