数据粉粹

public class AbsoluteFile
   {
       public event EventHandler FinishDeleteFileEvent = null;

       public event EventHandler FinishDeleteFolderEvent = null;

       public event EventHandler DeleteErrorEvent = null;

       public string ErrorString = string.Empty;

       public void DoAbsoluteDeleteFile(object filePath)
       {
           try
           {
               string filename = filePath.ToString();

               if (string.IsNullOrEmpty(filename))
               {
                   return;
               }

               if (File.Exists(filename))
               {
                   File.SetAttributes(filename, FileAttributes.Normal);

                   double sectors = Math.Ceiling(new FileInfo(filename).Length / 512.0);

                   byte[] dummyBuffer = new byte[512];

                   RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();

                   FileStream inputStream = new FileStream(filename, FileMode.Open);

                   inputStream.Position = 0;

                   for (int sectorsWritten = 0; sectorsWritten < sectors; sectorsWritten++)
                   {
                       rng.GetBytes(dummyBuffer);

                       inputStream.Write(dummyBuffer, 0, dummyBuffer.Length);

                       sectorsWritten++;
                   }

                   inputStream.SetLength(0);

                   inputStream.Close();

                   DateTime dt = new DateTime(2049, 1, 1, 0, 0, 0);

                   File.SetCreationTime(filename, dt);

                   File.SetLastAccessTime(filename, dt);

                   File.SetLastWriteTime(filename, dt);

                   File.Delete(filename);

                   WipeDone();
               }
           }
           catch (Exception e)
           {
               WipeError(e);
           }
       }

       public void DoDeleteFolder(object folder)
       {
           string folderPath = folder.ToString();

           if (string.IsNullOrEmpty(folderPath))
           {
               return;
           }

           DirectoryInfo direct = new DirectoryInfo(folderPath);

           FileSystemInfo[] filesystem = direct.GetFileSystemInfos();

           if (filesystem == null || filesystem.Length == 0)
           {
               direct.Delete();
           }
           else
           {
               foreach (FileSystemInfo fileItem in filesystem)
               {
                   if (fileItem is FileInfo)
                   {
                       this.DoAbsoluteDeleteFile(fileItem.FullName);
                   }
                   else
                   {
                       DoDeleteFolder(fileItem.FullName);
                   }
               }
           }

           if (this.FinishDeleteFolderEvent != null)
           {
               this.FinishDeleteFolderEvent(this, null);
           }
       }

       private void WipeError(Exception e)
       {
           if (DeleteErrorEvent != null)
           {
               ErrorString = e.Message;

               DeleteErrorEvent(this, null);
           }
       }

       private void WipeDone()
       {
           if (FinishDeleteFileEvent != null)
           {
               FinishDeleteFileEvent(this, null);
           }
       }
   }

顺便写了个简单的界面：
 
 后台：

 

 

public partial class Form1 : Form
   {
       private Thread dfileThread = null;

       private string fileObjectPath = string.Empty;

       private bool isFile = true;

       public delegate void DefaulEventDelegate(object sender, EventArgs e);

       public Form1()
       {
           InitializeComponent();
       }

       private void btnSelectFile_Click(object sender, EventArgs e)
       {
           isFile = true;

          this.openFileDialog1 = new OpenFileDialog();

          openFileDialog1.Multiselect = true;

          openFileDialog1.Title = "请选择文件";

          openFileDialog1.Filter = "所有文件(*.*)|*.*";

          if (openFileDialog1.ShowDialog() == DialogResult.OK)
           {
              this.txtFilePath.Text = openFileDialog1.FileName;
           }

          fileObjectPath = this.txtFilePath.Text.Trim();
       }

       private void btnSelectFolder_Click(object sender, EventArgs e)
       {
           isFile = false;

           this.folderBrowserDialog1  = new FolderBrowserDialog();

           folderBrowserDialog1.Description = "请选择文件路径";

           if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
           {
               this.txtFolder.Text = folderBrowserDialog1.SelectedPath;
           }

           fileObjectPath = this.txtFolder.Text.Trim();
       }

       private void btnAbsoluteDelete_Click(object sender, EventArgs e)
       {
           this.lblHint.Visible = true;

           if(string.IsNullOrEmpty(fileObjectPath))
           {
               MessageBox.Show("请选择要粉碎的文件和文件夹！");

               return;
           }

           AbsoluteFile dfile = new AbsoluteFile();

           dfile.DeleteErrorEvent += new EventHandler(Dfile_DeleteErrorEvent);

           if (isFile)
           {
               dfile.FinishDeleteFileEvent += new EventHandler(Dfile_FinishDeleteFileEvent);

               dfileThread = new Thread(new ParameterizedThreadStart(dfile.DoAbsoluteDeleteFile));

               dfileThread.IsBackground = true;

               dfileThread.Start(fileObjectPath);
           }
           else
           {
               dfile.FinishDeleteFolderEvent += new EventHandler(Dfile_FinishDeleteFolderEvent);

               dfileThread = new Thread(new ParameterizedThreadStart(dfile.DoDeleteFolder));

               dfileThread.IsBackground = true;

               dfileThread.Start(fileObjectPath);
           }

           this.lblHint.Text = @"正在删除...";
       }

       void Dfile_DeleteErrorEvent(object sender, EventArgs e)
       {
           if (!this.InvokeRequired)
           {
               MessageBox.Show((sender as AbsoluteFile).ErrorString);
           }
           else
           {
               this.BeginInvoke(new DefaulEventDelegate(Dfile_DeleteErrorEvent), new object[] { sender, e });

           }
       }

       void Dfile_FinishDeleteFolderEvent(object sender, EventArgs e)
       {
           if (!this.InvokeRequired)
           {
               this.lblHint.Visible = false;

               MessageBox.Show("删除完毕！");
           }
           else
           {
               this.BeginInvoke(new DefaulEventDelegate(Dfile_FinishDeleteFolderEvent),new object[] { sender,e });

           }
       }

       void Dfile_FinishDeleteFileEvent(object sender, EventArgs e)
       {
           if (!this.InvokeRequired)
           {
               this.lblHint.Visible = false;

               MessageBox.Show("删除完毕！");
           }
           else
           {
               this.BeginInvoke(new DefaulEventDelegate(Dfile_FinishDeleteFileEvent), new object[] { sender, e });

           }
       }
   }