從目錄中刪除除文件夾及其內容以外的所有文件

Question

我試圖刪除存儲卡上的所有文件而不刪除其中的一個。 我可以保留當前指定的目錄，但不能保留其內容。 它只保留空白文件夾數據，因為它刪除了其中的所有內容。 如何防止其刪除該文件夾及其內容？

private void button1_Click(object sender, EventArgs e)
{
   ScanDirectory scanDirectory = new ScanDirectory();
   scanDirectory.WalkDirectory(@"/Storage Card");
   scanDirectory.WalkDirectory(@"/Application");
}

public class ScanDirectory
{
   public void WalkDirectory(string directory)
   {
      WalkDirectory(new DirectoryInfo(directory));
   }

   private static void WalkDirectory(DirectoryInfo directory)
   {
      // Scan all files in the current path
      foreach (FileInfo file in directory.GetFiles())
      {
         file.Attributes &= ~FileAttributes.ReadOnly;

         var name = file.Name;
         name = name.ToLower();
         if (name != "test.txt")
         {
            file.Delete();
         }
      }
      DirectoryInfo[] subDirectories = directory.GetDirectories();
      foreach (DirectoryInfo subDirectory in subDirectories)
      {
         WalkDirectory(subDirectory);
         subDirectory.Attributes &= ~FileAttributes.ReadOnly;

         var name = subDirectory.Name;
         name = name.ToLower();
         if (name != "data")
         {
            subDirectory.Delete();
         }
      }
   }
}    

Answer 1

問題在於完成遞歸函數調用的方式：主函數private static void WalkDirectory(DirectoryInfo directory)刪除所有文件，並且每次都被調用（即使在分析子目錄時）。 在這里，您有一個修復程序，可以使此代碼按您的意願工作：

   private static void WalkDirectory(DirectoryInfo directory)
   {
       if (directory.Name.ToLower() != "data")
       {
         // Scan all files in the current path
         foreach (FileInfo file in directory.GetFiles())
         {
             file.Attributes &= ~FileAttributes.ReadOnly;

             var name = file.Name;
             name = name.ToLower();
             if (name != "test.txt")
             {
               file.Delete();
             }
         }

         DirectoryInfo[] subDirectories = directory.GetDirectories();
         foreach (DirectoryInfo subDirectory in subDirectories)
         {
            WalkDirectory(subDirectory);
            subDirectory.Attributes &= ~FileAttributes.ReadOnly;

            var name = subDirectory.Name;
            name = name.ToLower();
            if (name != "data")
            {
               subDirectory.Delete();
            }
         }
      }
   }

Answer 2

private static void WalkDirectory(DirectoryInfo directory)
   {
       if (directory.Name.ToLower() != "data")
       {
         // Scan all files in the current path
         foreach (FileInfo file in directory.GetFiles())
         {
             file.Attributes &= ~FileAttributes.ReadOnly;

             var name = file.Name;
             name = name.ToLower();
             if (name != "test.txt")
             {
               file.Delete();
             }
         }

         DirectoryInfo[] subDirectories = directory.GetDirectories();
         foreach (DirectoryInfo subDirectory in subDirectories)
         {
            WalkDirectory(subDirectory);
            subDirectory.Attributes &= ~FileAttributes.ReadOnly;

            var name = subDirectory.Name;
            name = name.ToLower();
            if (name != "data")
            {
               subDirectory.Delete();
            }
         }
      }
   }