创建和读写文件的一些简单方法_在读写文件前，必须采用什么方法创建文件-优快云博客

本文介绍了如何使用C#进行文件的基本读写操作，包括使用StreamWriter向文件写入数据、使用StreamReader读取整个文件内容、逐行读取文件内容、按字节读取文件以及按块读取文件的方法。

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1 使用StreamWriter向文件写入数据

public static void WriteToLog(string logFileName, string data) { using (FileStream fileStream = new FileStream(logFileName, FileMode.Append, FileAccess.Write, FileShare.None)) { using (StreamWriter streamWrtie = new StreamWriter(fileStream)) { streamWrtie.Write(data); } } }

2 用StreamReader读取文本

public static string ReadAllLog(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } string contents = ""; using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamRead = new StreamReader(fileStream)) { contents = streamRead.ReadToEnd(); } } return contents; }

3 要逐行的读取文本，则使用peek（）方法

public static void ReadLogPeeking(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { while (streamReader.Peek() != -1) { Console.WriteLine(streamReader.ReadLine()); } } } }

或

public static void ReadLogByLines(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { string text = streamReader.ReadLine(); while (text != null) { Console.WriteLine(text); text = streamReader.ReadLine(); } } } }

4 若要读取一个字节则用read()方法

public static void ReadLogAsBytes(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { while (streamReader.Peek() != -1) { Console.WriteLine(streamReader.Read()); } } } }

5 按块读取，则要创建一个任意长度的缓冲区,这个长度根据你的性能需求来决定

public static void ReadAllBuffereLog(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { while (streamReader.Peek() != -1) { char[] buffer=new char [10]; int bufferFileSize = streamReader.Read(buffer, 0, 10); foreach (char c in buffer) { Console.Write(c); } Console.WriteLine(); Console.WriteLine(bufferFileSize); } } } }