using( StreamWriter logWriter = File.CreateText( logFileName ) )
  {
    for (int i = 0; i < 500; i++)
      logWriter.WriteLine( "Process completed successfully." );
  }

写出文件时,会生成以下输出：

Process completed successfully.
  ...  (497 more lines)
  Process completed successfully.
  Process completed s

尝试在关闭前添加logWriter.Flush(),没有任何帮助.我写出的文本行越多,发生的数据丢失就越多.