c# 文件操作的一些函数

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遍历文件夹

public void GetAllFiles(string directoryPath){     var rootDirectory = new DirectoryInfo(directoryPath);     foreach (var file in rootDirectory.GetFiles())     {         Console.WriteLine("File Name: {0}", file.Name);     }     foreach (var directory in rootDirectory.GetDirectories())     {         Console.WriteLine("Directory Name: {0}", directory.Name);         this.GetAllFiles(directory.FullName);     } }

MemoryStream内存读写

public static void ShowMemoryString(string testString){     using (MemoryStream stream = new MemoryStream())     {         if (stream.CanWrite)         {             byte[] buffer = Encoding.Default.GetBytes(testString);             stream.Write(buffer, 0, buffer.Length);             byte[] resultBuffer = stream.ToArray();             string resultString = Encoding.UTF8.GetString(resultBuffer);             Console.WriteLine(resultString);         }     }}

二进制流文件读取
第一种方法（直接申请等于数据长的缓存）

public static void ShowFileContent(string filePath) {     FileStream fileStream = File.Open(filePath, FileMode.Open);     byte[] fileContentBuffer = new byte[fileStream.Length];     fileStream.Read(fileContentBuffer, 0, fileContentBuffer.Length);     fileStream.Close();     string fileContent = Encoding.Default.GetString(fileContentBuffer);     Console.WriteLine(fileContent);}

第二种方法（第一种的改进 使用完流之后进行关闭）

public static void ShowFileContent(string filePath) {     // Way 2     byte[] fileContentBuffer;     using (FileStream fileStream = File.Open(filePath, FileMode.OpenOrCreate))     {         fileContentBuffer = new byte[fileStream.Length];         fileStream.Read(fileContentBuffer, 0, fileContentBuffer.Length);     }     string fileContent = Encoding.Default.GetString(fileContentBuffer);     Console.WriteLine(fileContent);}

第三种方法 （每次读四字节）

public static void CopyFileContent(string sourceFilePath, string destinationFilePath) {     using (FileStream destinationFileStream = File.Open(                  destinationFilePath, FileMode.Create, FileAccess.Write))     {        // Way 1         const int bufferSize = 4 * 1024 * 1024;         byte[] fileContentBuffer = new byte[bufferSize];         using (FileStream sourceFileStream = File.Open(                   sourceFilePath, FileMode.Open, FileAccess.Read))         {             int data;             do             {                 data = sourceFileStream.Read(fileContentBuffer, 0, fileContentBuffer.Length);                 destinationFileStream.Write(fileContentBuffer, 0, data);             } while (data > 0);         }     }}

第四种更简化

public static void ShowFileContent(string filePath) {     // Way 3     using (StreamReader fileReader = new StreamReader(          File.Open(filePath, FileMode.OpenOrCreate)))     {         Console.WriteLine(fileReader.ReadToEnd());     }}

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