我正忙于在 VS2010（大学作业）中创建索引 Windows 窗体应用程序的文件/文件夹。出于测试目的，文件/文件夹索引类位于控制台应用程序中
我使用以下内容浏览文件夹，它运行良好并写入指定驱动器中的所有文件夹名称。我主要从 msdn 资源（使用递归方法）将它放在一起，并进行了修改，因为它不包括获取文件夹名称。
我想排除某些文件夹，并决定使用 lambda 表达式和带有单词列表的 List 将是最快的，尽管我可以放置一个循环通过一个带有 if 比较的数组，但在我看来这会更慢（并不是说我对 c# 中复杂的工作方式了解得足够多）。我已经简要了解了 lambda 表达式，看看我自己是否无法修复它。
这是我的代码在没有任何文件夹排除的情况下工作
class Program
{
static System.Collections.Specialized.StringCollection log = new System.Collections.Specialized.StringCollection();
private static List<string> _excludedDirectories = new List<string>() { "Windows", "AppData", "$WINDOWS.~BT", "MSOCache", "ProgramData", "Config.Msi", "$Recycle.Bin", "Recovery", "System Volume Information", "Documents and Settings", "Perflogs" };
//method to check
static bool isExcluded(List<string> exludedDirList, string target)
{
return exludedDirList.Any(d => new DirectoryInfo(target).Name.Equals(d));
}
static void Main()
{
string[] drives = {"C:\\"};
foreach (string dr in drives)
{
DriveInfo di = new System.IO.DriveInfo(dr);
// Here we skip the drive if it is not ready to be read.
if (di.IsReady)
{
DirectoryInfo rootDir = di.RootDirectory;
WalkDirectoryTree(rootDir);
}
else
{
Console.WriteLine("The drive {0} could not be read", di.Name);
continue;
}
}
// Write out all the files that could not be processed.
Console.WriteLine("Files with restricted access:");
foreach (string s in log)
{
Console.WriteLine(s);
}
// Keep the console window open in debug mode.
Console.WriteLine("Press any key");
Console.ReadKey();
}
static void WalkDirectoryTree(System.IO.DirectoryInfo root)
{
FileInfo[] files = null;
DirectoryInfo[] subDirs = null;
StreamWriter filex = new System.IO.StreamWriter("test.txt", true);
if (filex != null)
{
filex.Close();
}
// Process all the folders directly under the root
try
{
subDirs = root.GetDirectories();
}// This is thrown if even one of the folders requires permissions greater than the application provides.
catch (UnauthorizedAccessException e)
{
log.Add(e.Message);
}
catch (System.IO.DirectoryNotFoundException e)
{
Console.WriteLine(e.Message);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
// Process all the files directly under the root
try
{
files = root.GetFiles("*.*");
}// This is thrown if even one of the files requires permissions greater than the application provides.
catch (UnauthorizedAccessException e)
{
log.Add(e.Message);
}
catch (System.IO.DirectoryNotFoundException e)
{
Console.WriteLine(e.Message);
}
catch(Exception e)
{
Console.WriteLine(e.Message);
}
if (files != null)
{
filex = new StreamWriter("test.txt", true);
foreach (FileInfo fi in files)
{
// In this example, we only access the existing FileInfo object. If we
// want to open, delete or modify the file, then
// a try-catch block is required here to handle the case
// where the file has been deleted since the call to TraverseTree().
Console.WriteLine(fi.FullName);
filex.WriteLine(fi.FullName);
}
filex.Close();
}
if (subDirs != null)
{
//var filteredDirs = Directory.GetDirectories(root.Name).Where(d => !isExcluded(_excludedDirectories, d));
foreach (DirectoryInfo subds in subDirs)
{
filex = new StreamWriter("test.txt", true);
Console.WriteLine(subds.FullName);
filex.WriteLine(subds.FullName);
filex.Close();
foreach (DirectoryInfo dirInfo in subDirs)
{
// Resursive call for each subdirectory.
WalkDirectoryTree(dirInfo);
}
}
filex.Close();// Because at end filestream needs to close
}
}
}
所以我尝试将 .Where(d => !isExcluded(_excludedDirectories, d)) 合并到我的循环中：
if (subDirs != null)
{
//var filteredDirs = Directory.GetDirectories(root.Name).Where(d => !isExcluded(_excludedDirectories, d));
foreach (DirectoryInfo subds in subDirs.Where(d => !isExcluded(_excludedDirectories, d)))
{
filex = new StreamWriter("test.txt", true);
Console.WriteLine(subds.FullName);
filex.WriteLine(subds.FullName);
filex.Close();
foreach (DirectoryInfo dirInfo in subDirs)
{
// Resursive call for each subdirectory.
WalkDirectoryTree(dirInfo);
}
}
filex.Close();// Because at end filestream needs to close
}
问题：在感叹号“最好的重载方法匹配有一些无效的参数......”之后我得到一个错误我应该做什么/改变，我应该采取更简单的路线并在我的循环中使用循环和 if 语句文件夹名称？因为我也明白怎么做。并记住我目前正在做的方式（至少尝试）是因为我认为它会更优化/更快。如果它没有产生如此大的不同，请告诉我，我会使用我知道的方式。
我的猜测是，我试图在 foreach 中放置一个 .where 是在做一件坏事，我意识到它为什么是或可能是。
我也试过：
if (subDirs != null)
{
//var filteredDirs = Directory.GetDirectories(root.Name).Where(d => !isExcluded(_excludedDirectories, d));
foreach (DirectoryInfo subds in subDirs)
{
if ((d => !isExcluded(_excludedDirectories, d)))
{
filex = new StreamWriter("test.txt", true);
Console.WriteLine(subds.FullName);
filex.WriteLine(subds.FullName);
filex.Close();
foreach (DirectoryInfo dirInfo in subDirs)
{
// Resursive call for each subdirectory.
WalkDirectoryTree(dirInfo);
}
}
}
filex.Close();// Because at end filestream needs to close
}
但是得到一个错误，因为它不是委托，所以无法将 Lamba 表达式转换为类型 bool
如果您想查看其他代码，请告诉我，然后我将添加它，只是看起来有点多。