彻底删除文件代码,CSharp代码库,德仔网

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【CSharp】彻底删除文件
作者:欣玉 / 发布于2015/11/4/ 599
经常用360的文件粉碎，删除隐私文件貌似还不错的。不过C#也可以实现彻底删除文件。试了下用360文件恢复恢复不了源文件了。

	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);
	 }
	 }
	 }

	

	

	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 });
	
	 }
	 }
	 }
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