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。哪裏出錯我忙創建文件/文件夾的索引Windows窗體應用程序VS2010（分配上大學）。出於測試目的，文件/文件夾的索引類是在一個控制檯應用程序掌握使用foreach循環lambda表達式爲無效的參數
我用下面去通過文件夾，它運行良好，並寫入到文件中指定的驅動器中的所有文件夾的名稱。我主要從msdn資源（使用遞歸方法）一起拋出它，並且因爲它不包括獲取文件夾名稱而被修改。
我想排除某些文件夾，並決定使用一個lambda表達式和列表的單詞將是最快的，雖然我可以放置一個循環，通過數組與if比較，但在我看來，這會比較慢（這不是我對c＃中錯綜複雜的工作知之甚少）。我簡要了解了lambda表達式，看看我自己是否無法修復它。
這裏工作我的代碼沒有任何文件夾排除
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，我想結合。哪裏（d => isExcluded（_excludedDirectories，d）！）到我的循環：
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
}
問題：我得到一個錯誤，從感嘆說：「最好的重載的方法匹配具有一些無效的ARGS ...」我應該怎麼辦/變更後，我應該走簡單的路線，並使用一個循環，如果在我的循環語句寫入文件夾名稱？因爲我也明白如何做到這一點。請記住我目前的工作方式（至少嘗試）是因爲我認爲它會更優化/更快。如果它沒有這麼大的差別，讓我知道，我會用我知道的方式。
我的猜測是，我試圖把一個。凡有在foreach做了壞事，我明白爲什麼這是或可能是。
我也試過：
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
}
但獲取有關不能轉換蘭巴表達式bool類型的錯誤，因爲它不是委託
讓我知道，如果你想看到的其他代碼，然後我會添加它，似乎有點多。
你能粘貼代碼作爲一個塊？這樣很難全部閱讀。 – Haney
@ DavidH，好的，我會在這裏添加代碼 –