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。
希望本文所述对大家的c#程序设计有所帮助。
如对本文有疑问,
点击进行留言回复!!
相关文章:
-
-
-
C#实现猜数字游戏
本文实例为大家分享了c#实现猜数字游戏具体代码,供大家参考,具体内容如下给定一个0-100的随机数字猜其大小题目样式:电脑产生一个0到100之间的随机数字,并且...
[阅读全文]
-
-
C# 可空类型的具体使用
在项目中我们经常会遇到可为空类型,那么到底什么是可为空类型呢?下面我们将从4个方面为大家剖析。1、可空类型基础知识顾名思义,可空类型指的就是某个对象类型可以为空...
[阅读全文]
-
-
-
C#实现猜数字小游戏
本文实例为大家分享了c#实现猜数字小游戏的具体代码,供大家参考,具体内容如下效果如图:代码:using system;using system.collecti...
[阅读全文]
-
-
C#实现简单俄罗斯方块
最近在看《.net游戏编程入门经典 c#篇》 第一章介绍了如何制作俄罗斯方块,自己试了试按照书上的步骤,可算是完成了。于是写下这篇文章留作纪念。1.类的设计在充...
[阅读全文]
-
网友评论