获取目录与并行的ForEach

Question

我有一个递归通过目录，并建立一个树的方法：

public void RecurseFolders(TreeNode mainNode) { 
    DirectoryInfo nodeDir = new DirectoryInfo(mainNode.Tag.ToString()); 
    try { 
    foreach (var dir in nodeDir.GetDirectories()) { 
     int index = GetSystemIcon(dir.FullName, treeView1.ImageList, false); 
     var subNode = new TreeNode(dir.Name, index, index); 
     subNode.Tag = dir.FullName; 
     mainNode.Nodes.Add(subNode); 
     RecurseFolders(subNode); 
    } 
    } catch (UnauthorizedAccessException err) { 
    Console.WriteLine(err); 
    } 
} 

我想如何处理此做的是找到一种方法来写一个Parallel.ForEach出来的它，但我的LINQ知识太处女了。

显然，我不能将TreeNode传入线程，所以我修改了签名以使其更通用。这是我得到的：

public string[] RecurseFolders(string dirString) { 
    List<string> list = new List<string>(); 
    DirectoryInfo nodeDir = new DirectoryInfo(dirString); 
    Parallel.ForEach(nodeDir.GetDirectories(), dir => { 
    // how do I write this? 
    }); 
    return list.ToArray(); 
} 

我该如何完成它？

编辑：

这是拉动目录和文件的列表，从我们的网络存储驱动器。通过网络获取信息目前是我们的瓶颈，但它是我学习一些并行处理技术的好地方。

Answer 1

但你已经做到了！

public string[] RecurseFolders(string dirString) { 
     List<string> list = new List<string>(); 
     DirectoryInfo nodeDir = new DirectoryInfo(dirString); 
     Parallel.ForEach(nodeDir.GetDirectories(), dir => { 
//Just continue writing here. This is an Action. Google it for more info. But for the purposes of this example you may consider it as method which will be called for each of the items 
     }); 
     return list.ToArray(); 
    }