C#对文件操作（基本的读写以及压缩和解压）

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主要是针对单个文件进行读写操作和压缩操作：用到的主要C#类有FileStream、FileInfo、StreamWrite、StreamRead、GZipStream。

字符数组和字节数组的转换：

 1  byte[] bytedata = new byte[200]; 2             char[] chardata = new char[200]; 3             try 4             { 5                 FileStream fs = new FileStream("App.config", FileMode.Open); 6                 fs.Seek(0, SeekOrigin.Begin); 7                 fs.Read(bytedata, 0, 200); 8             } 9             catch (IOException io)10             {11                 Console.WriteLine(io.ToString());12                 Console.ReadKey();13                 return;14             }15             Decoder dc = Encoding.UTF8.GetDecoder();//创建一个解码器用来对二进制数组解码成字符数组16             dc.GetChars(bytedata, 0, bytedata.Length, chardata, 0);17             Console.WriteLine(chardata);18             Console.ReadKey();19             byte[] byteData;20             char[] charData;21             try22             {23                 FileStream fs = new FileStream("Log.txt", FileMode.Create);24                 charData = "this is the user first log the software".ToCharArray();25                 Encoder e = Encoding.UTF8.GetEncoder();26                 byteData = new byte[charData.Length];27                 e.GetBytes(charData, 0, charData.Length, byteData, 0, true);28                 fs.Seek(0, SeekOrigin.End);29                 fs.Write(byteData, 0, byteData.Length);30             }31             catch (IOException io)32             {33                 Console.WriteLine(io.ToString());34                 Console.ReadKey();35                 return;36             }37             Console.ReadKey();

对文件进行压缩和解压（一单个文件为例）：

 1 string fileName = "CompressedFile.txt"; 2             Console.WriteLine("Please input a word and it will repeate 100 times"); 3             string inputString = Console.ReadLine(); 4             StringBuilder sourceString = new StringBuilder(inputString.Length * 100); 5             for (int i = 0; i < 100; i++)  6             { 7                 sourceString.AppendLine(inputString); 8             } 9             string sourceCompresses = sourceString.ToString();10             Console.WriteLine("source data's length is {0}", sourceCompresses.Length);11             try12             {13                 CompressedFile(fileName, sourceCompresses);14                 Console.WriteLine("Compressed successfully");15                 FileInfo fileInfo = new FileInfo(fileName);16                 Console.WriteLine("compressed file's length is{0}", fileInfo.Length);17                 string loadCompressed = LoadCompressedFile(fileName);18                 Console.WriteLine(loadCompressed);19             }20             catch (IOException io)21             {22                 Console.WriteLine(io.ToString());23                 Console.ReadKey();24                 return;25             }26             Console.ReadKey();27         }28 29         private static void CompressedFile(string fileName, string sourceCompress) 30         {31             FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);32             GZipStream gzCompressedFile = new GZipStream(fs, CompressionMode.Compress);33             StreamWriter sw = new StreamWriter(gzCompressedFile,Encoding.UTF8);34             sw.Write(sourceCompress);35             sw.Close();36         }37 38         private static string LoadCompressedFile(string fileName) 39         {40             FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);41             GZipStream gzLoadCompressed = new GZipStream(fs, CompressionMode.Decompress);42             StreamReader sr = new StreamReader(gzLoadCompressed,Encoding.UTF8);43             StringBuilder strBuild = new StringBuilder();44             string strReadLine = sr.ReadLine();45             while (!string.IsNullOrEmpty(strReadLine)) 46             {47                 strBuild.Append(strReadLine);48                 strReadLine = sr.ReadLine();49             }50             return strBuild.ToString();51         }

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