FileStream fs = new FileStream("F:\\log.txt", FileMode.OpenOrCreate);
fs.Position = fs.Length;//设置尾部添加
StreamWriter sw = new StreamWriter(fs);
sw.WriteLine("111111");
sw.Close();
fs.Position = fs.Length;//设置尾部添加
StreamWriter sw = new StreamWriter(fs);
sw.WriteLine("111111");
sw.Close();