C#实现彻底删除文件的方法

资料来源：网络整理时间：2023/2/14 1:02:07 共计：3603 浏览

本文实例讲述了C#实现彻底删除文件的方法。分享给大家供大家参考。具体实现方法如下：

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。

主要代码如下：

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：

后台代码如下所示：

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 });
           }
       }
}

完整实例代码点击此处本站下载。

希望本文所述对大家的C#程序设计有所帮助。

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