Question

如何在循环到Directory.GetDirectories之前动态添加其他路径？：

foreach (string d in Directory.GetDirectories(dirpath))
{
    foreach (string f in Directory.GetFiles(d))
    {
        Console.WriteLine(f);
        File.Copy(f,"");
    }

}

例如，我需要它像

foreach (Directory dir in Directory.GetDirectories(dirpath).Add("another path"))
{ 
//My other code here.... 
}

怎么做？

由于

Answer 1

也许是这样的：

Directory.GetDirectories(dirpath).Concat(new string[] { "another path"});

您需要在课程顶部添加using System.Linq;。

关于预期结果的附注：

你不能foreach (Directory dir因为Directory是一个静态类，你不能拥有它的实例。但您可以使用DirectoryInfo：

var dirs = Directory.GetDirectories(dirpath)
                    .Concat(new string[] { "another path" })
                    .Select(path => new DirectoryInfo(path));

foreach (DirectoryInfo dir in dirs)
{

}

Answer 2

var dir = Directory.GetDirectories(dirpath);
dir.Add("another path");
foreach (string d in dir)
 {
     foreach (string f in Directory.GetFiles(d))
     {
        Console.WriteLine(f);
        File.Copy(f,"");
     }
 }

Answer 3

为了实现这样的目标，您可以使用递归方法，如：

  public void Fileprocessing(directories){
             foreach (string d in directories)
                            {
                foreach (string f in Directory.GetFiles(d))
                                    {
                                    Console.WriteLine(f);
                                        File.Copy(f,"");
                                    }
            }
                if(conditionToAddPath){
                directories.Add("another path");
                Fileprocessing(directories);
                }
    }

当您第一次调用初始化目录时，如：

...

string[] directories = Directory.GetDirectories(dirpath);
Fileprocessing(directories);

...

注意：这是一个伪编码的答案!!请在实施之前查看或通过添加即用型实施代码来完成此答案。

Answer 4

使用SelectMany的一种方式：

var paths = new List<string> { "path1", "path2", "path3" };
var files = paths.SelectMany(Directory.GetDirectories).SelectMany(Directory.GetFiles);
paths.Add("path4");

foreach (var file in files)
    Console.WriteLine(file);

使用select的另一种方式：

var paths = new List<string> { "path1", "path2", "path3" };
var query = from path in paths
            from dir in Directory.GetDirectories(path)
            from file in Directory.GetFiles(dir)
            select file;
paths.Add("path4");

foreach (var file in query)
    Console.WriteLine(file);

在C＃开始循环之前将项添加到集合中

4 个答案:

关于预期结果的附注：