c# 读写文件

StreamWriter writeLog;
writeLog = new StreamWriter("log.txt");
writeLog.WriteLine("hello world");
writeLog.Flush();   //清空缓存，否者文件的内容不会实时更新
writeLog.close();

StreamReader readLog
readLog = new StreamReader("log.txt"))
string line;
line = sr.ReadLine();
Console.WriteLine(line);
readLog.close();

StreamWriter writeLog;
StreamWriter writeTempLog;
StreamReader readTempLog;
FileStream Log;

Log = new FileStream("log.txt", FileMode.Create, FileAccess.ReadWrite,FileShare.ReadWrite);
writeLog = new StreamWriter(Log);

readTempLog = new StreamReader(LogTemp);
string logData;
logData = readTempLog.ReadLine();
while ((logData = readTempLog.ReadLine()) != null)
{
writeLog.WriteLine(logData);
writeLog.Flush();
}
readTempLog.Close();
writeLog.Close();
Log.Close();