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string textContent = fileStream.ReadToEnd();byte[] bytes = System.Text.Encoding.Default.GetBytes(textContent); 字符數(shù)據(jù)易于使用， 但是有些操作，比如隨機(jī)文件訪問(訪問文件中間某點(diǎn)的數(shù)據(jù))，就必須由FileStream對(duì)象執(zhí)行. 其中創(chuàng)建FileStream對(duì)象最簡(jiǎn)單的構(gòu)造函數(shù)如下： 1  FileStream file = new FileStream(fileName,FileMode.Member);2 FileStream file = new FileStream(fileName, FileMode.Member, FileAccess.Member);而FileAccess的成員：
對(duì)文件進(jìn)行不是FileAccess枚舉成員指定的操作會(huì)導(dǎo)致拋出異常。此屬性的作用是，基于用戶的身份驗(yàn)證級(jí)別改變用戶對(duì)文件的訪問權(quán)限。 在FileStream構(gòu)造函數(shù)不使用FileAccess枚舉參數(shù)的版本中，使用默認(rèn)值FileAccess. ReadWrite。 FileMode枚舉成員,使用每個(gè)值會(huì)發(fā)生什么，取決于指定的文件名是否表示已有的文件。
StreamWriter允許將字符和字符串寫入文件，它處理底層的轉(zhuǎn)換，向FileStream對(duì)象寫入數(shù)據(jù)。StreamReader也類似。 實(shí)例： 1 using System;2 using System.Data;3 using System.IO;4 using System.Text;5 6   /**//// <summary>7  /// Summary description for FileReadAndWrite8  /// </summary>9 public class FileReadAndWrite10 {11 public FileReadAndWrite()12 {13 //14 // TODO: Add constructor logic here15 //16 }17 /**//// <summary>18 /// 用FileStream寫文件19 /// </summary>20 /// <param name="str"></param>21 /// <returns></returns>22 public void FileStreamWriteFile(string str)23 {24 byte[] byData;25 char[] charData;26 try27 {28 FileStream nFile = new FileStream("love.txt", FileMode.Create);29 //獲得字符數(shù)組30 charData = str.ToCharArray();31 //初始化字節(jié)數(shù)組32 byData = new byte[charData.Length];33 //將字符數(shù)組轉(zhuǎn)換為正確的字節(jié)格式34 Encoder enc = Encoding.UTF8.GetEncoder();35 enc.GetBytes(charData, 0, charData.Length,byData,0,true);36 nFile.Seek(0, SeekOrigin.Begin);37 nFile.Write(byData, 0, byData.Length);38 }39 catch (Exception ex)40 {41 throw ex;42 }43 }44 /**//// <summary>45 /// FileStream讀取文件46 /// </summary>47 /// <param name="filePath"></param>48 /// <returns></returns>49 public string FileStreamReadFile(string filePath)50 {51 byte[] data = new byte[100];52 char[] charData = new char[100];53 try54 {55 FileStream file = new FileStream(filePath, FileMode.Open);56 //文件指針指向0位置57 file.Seek(0, SeekOrigin.Begin);58 //讀入兩百個(gè)字節(jié)59 file.Read(data, 0, 200);60 //提取字節(jié)數(shù)組61 Decoder dec = Encoding.UTF8.GetDecoder();62 dec.GetChars(data, 0, data.Length, charData, 0);63 }64 catch (Exception ex)65 {66 throw ex;67 }68 return Convert.ToString(charData);69 }70 /**//// <summary>71 /// StreamWriter寫文件72 /// </summary>73 public void StreamWriterWriteFile()74 {75 try76 {77 FileStream nFile = new FileStream("love.txt", FileMode.CreateNew);78 StreamWriter writer = new StreamWriter(nFile);79 80 writer.WriteLine("I love You!");81 writer.WriteLine("Do you love me!");82 writer.Close();83 }84 catch85 { }86 }87 /**//// <summary>88 /// StreamReader讀取文件89 /// </summary>90 /// <returns></returns>91 public string StreamReaderReadFile()92 {93 string str="";94 try95 {96 FileStream file = new FileStream("love.txt", FileMode.Open);97 StreamReader sr = new StreamReader(file);98 while (sr.ReadLine()!=null)99 {100 str += sr.ReadLine();101 }102 //或者str = sr.ReadToEnd();103 sr.Close();104 }105 catch106 { }107 return str;108 }109 }110 |
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