C#实现彻底删除文件的方法

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。