将foreach语句转换为for语句 [英] Convert foreach statement to for statement

问题描述

我的代码中有一个要求，我需要在For循环中使用以下语句:

I have a requirement in my code where i need the below statement in For loop:

foreach (FileInfo fi in source_s.GetFiles())
{
   fi.CopyTo(Path.Combine(dest_d.ToString(), fi.Name), true);
}

如果有人知道，请帮帮我..

help me if anybody knows..

推荐答案

为避免重复调用GetFiles()，这可能会使您的应用程序运行速度大大降低，请一次获取文件在开始for循环之前.

To avoid repeated calls to GetFiles(), which could slow your application down considerably, get the files once before starting the for loop.

FileInfo[] foundFiles = source_s.GetFiles();
for (int i = 0; i < foundFiles.Length; i++)
{
  foundFiles[i].CopyTo(Path.Combine(dest_d.ToString(), foundFiles[i].Name), true);
}

甚至

or even

FileInfo[] foundFiles = source_s.GetFiles();
for (int i = 0; i < foundFiles.Length; i++)
{
  FileInfo fi = foundFiles[i];
  fi.CopyTo(Path.Combine(dest_d.ToString(), fi.Name), true);
}

首先，我不明白为什么要将foreach转换为for.

如果仍要执行此操作，则将所有文件的计数放入变量
然后运行for循环-

Firstly I dont see why you should be converting foreach to for.

If you still want to do it get the count of all files into a variable
and then run a for loop -

for(int i=0;i++,i<count)
{
      fi.CopyTo(Path.Combine(dest_d.ToString(), source_s.GetFiles()[i].Name), true);
}

其中count是文件列表.

我不确定{c1>是否可以正常工作，因为我不知道source_s.GetFiles()返回的是....

where count is the list of your files.

I''m not absolutely sure if source_s.GetFiles()[i].Name this work as I dont know what source_s.GetFiles() is returning....

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