在C＃中嵌套使用语句 [英] Nested using statements in C#

问题描述

我工作的一个项目，要比较两个文件，​​并查看它们是否匹配海誓山盟excatly。

I am working on a project and have to compare two files and see if they match eachother excatly.

错误检查和验证之前，很多我的第一份草案提出了：

My first draft before alot of error checking and validation came up with:

  DirectoryInfo di = new DirectoryInfo(Environment.CurrentDirectory + "\\TestArea\\");
  FileInfo[] files = di.GetFiles(filename + ".*");

  FileInfo outputFile = files.Where(f => f.Extension == ".out").Single<FileInfo>();
  FileInfo expectedFile = files.Where(f => f.Extension == ".exp").Single <FileInfo>();

  using (StreamReader outFile = new StreamReader(outputFile.OpenRead()))
  {
    using (StreamReader expFile = new StreamReader(expectedFile.OpenRead()))
    {
      while (!(outFile.EndOfStream || expFile.EndOfStream))
      {
        if (outFile.ReadLine() != expFile.ReadLine())
        {
          return false;
        }
      }
      return (outFile.EndOfStream && expFile.EndOfStream);
    }
  }

这似乎有点奇怪using语句嵌套的。

It seems a little odd to have nested using statements.

有没有更好的方式来做到这一点？

Is there a better way to do this?

推荐答案

在preferred办法做到这一点是只把开括号 {在最后使用语句，像这样的：

The preferred way to do this is to only put an opening brace { after the last using statement, like this:

using (StreamReader outFile = new StreamReader(outputFile.OpenRead()))
using (StreamReader expFile = new StreamReader(expectedFile.OpenRead())) 
{
    ///...
}

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