在同一语句中检查空值和流结尾 [英] check for null and end of stream in same statement

问题描述

while ((line = sr.ReadLine()) != null && !sr.EndOfStream)

这不起作用.它实际上一直在循环，我得到一个异常，因为行"为空，并且已达到 EndofStream.有什么想法吗?

This does not work. It literally keeps looping and I get an exception because "line" is null, and the EndofStream has been reached. Any idea?

推荐答案

如果你把这两个检查放在一起，即使 ReadLine() 在到达 EndOfStream 之前为空，代码也会避免循环代码>.以下是细分版本，但会贯穿整个流程.

If you put both checking together, code will escape looping even if ReadLine() is null before reaching EndOfStream. Following is a breakdown version but will go through the whole stream.

while (!sr.EndOfStream)
{
   if ((line = sr.ReadLine()) != null)
   {
      //do your work here
   }
}

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