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1. public class AbsoluteFile  
2.    {  
3.        public event EventHandler FinishDeleteFileEvent = null;  
4.   
5.        public event EventHandler FinishDeleteFolderEvent = null;  
6.   
7.        public event EventHandler DeleteErrorEvent = null;  
8.   
9.        public string ErrorString = string.Empty;  
10.   
11.        public void DoAbsoluteDeleteFile(object filePath)  
12.        {  
13.            try  
14.            {  
15.                string filename = filePath.ToString();  
16.   
17.                if (string.IsNullOrEmpty(filename))  
18.                {  
19.                    return;  
20.                }  
21.   
22.                if (File.Exists(filename))  
23.                {  
24.                    File.SetAttributes(filename, FileAttributes.Normal);  
25.                     
26.                    double sectors = Math.Ceiling(new FileInfo(filename).Length / 512.0);  
27.                     
28.                    byte[] dummyBuffer = new byte[512];  
29.                     
30.                    RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();  
31.                     
32.                    FileStream inputStream = new FileStream(filename, FileMode.Open);  
33.   
34.                    inputStream.Position = 0;  
35.                     
36.                    for (int sectorsWritten = 0; sectorsWritten < sectors; sectorsWritten++)  
37.                    {  
38.                        rng.GetBytes(dummyBuffer);  
39.   
40.                        inputStream.Write(dummyBuffer, 0, dummyBuffer.Length);  
41.   
42.                        sectorsWritten++;  
43.                    }  
44.   
45.                    inputStream.SetLength(0);  
46.   
47.                    inputStream.Close();  
48.                     
49.                    DateTime dt = new DateTime(2049, 1, 1, 0, 0, 0);  
50.   
51.                    File.SetCreationTime(filename, dt);  
52.   
53.                    File.SetLastAccessTime(filename, dt);  
54.   
55.                    File.SetLastWriteTime(filename, dt);  
56.   
57.                    File.Delete(filename);  
58.   
59.                    WipeDone();  
60.                }  
61.            }  
62.            catch (Exception e)  
63.            {  
64.                WipeError(e);  
65.            }  
66.        }  
67.   
68.        public void DoDeleteFolder(object folder)  
69.        {  
70.            string folderPath = folder.ToString();  
71.   
72.            if (string.IsNullOrEmpty(folderPath))  
73.            {  
74.                return;  
75.            }  
76.   
77.            DirectoryInfo direct = new DirectoryInfo(folderPath);  
78.   
79.            FileSystemInfo[] filesystem = direct.GetFileSystemInfos();  
80.   
81.            if (filesystem == null || filesystem.Length == 0)  
82.            {  
83.                direct.Delete();  
84.            }  
85.            else  
86.            {  
87.                foreach (FileSystemInfo fileItem in filesystem)  
88.                {  
89.                    if (fileItem is FileInfo)  
90.                    {  
91.                        this.DoAbsoluteDeleteFile(fileItem.FullName);  
92.                    }  
93.                    else  
94.                    {  
95.                        DoDeleteFolder(fileItem.FullName);  
96.                    }  
97.                }  
98.            }  
99.   
100.            if (this.FinishDeleteFolderEvent != null)  
101.            {  
102.                this.FinishDeleteFolderEvent(this, null);  
103.            }  
104.        }  
105.   
106.        private void WipeError(Exception e)  
107.        {  
108.            if (DeleteErrorEvent != null)  
109.            {  
110.                ErrorString = e.Message;  
111.   
112.                DeleteErrorEvent(this, null);  
113.            }  
114.        }  
115.   
116.        private void WipeDone()  
117.        {  
118.            if (FinishDeleteFileEvent != null)  
119.            {  
120.                FinishDeleteFileEvent(this, null);  
121.            }  
122.        }  
123.    }  

顺便写了个简单的界面：
 
 后台：

[csharp] view plaincopyprint?

 

1. public partial class Form1 : Form  
2.    {  
3.        private Thread dfileThread = null;  
4.   
5.        private string fileObjectPath = string.Empty;  
6.   
7.        private bool isFile = true;  
8.   
9.        public delegate void DefaulEventDelegate(object sender, EventArgs e);  
10.   
11.        public Form1()  
12.        {  
13.            InitializeComponent();  
14.        }  
15.   
16.        private void btnSelectFile_Click(object sender, EventArgs e)  
17.        {  
18.            isFile = true;  
19.   
20.           this.openFileDialog1 = new OpenFileDialog();  
21.   
22.           openFileDialog1.Multiselect = true;  
23.   
24.           openFileDialog1.Title = "请选择文件";  
25.   
26.           openFileDialog1.Filter = "所有文件(*.*)|*.*";  
27.   
28.           if (openFileDialog1.ShowDialog() == DialogResult.OK)  
29.            {  
30.               this.txtFilePath.Text = openFileDialog1.FileName;  
31.            }  
32.   
33.           fileObjectPath = this.txtFilePath.Text.Trim();  
34.        }  
35.   
36.        private void btnSelectFolder_Click(object sender, EventArgs e)  
37.        {  
38.            isFile = false;  
39.   
40.            this.folderBrowserDialog1  = new FolderBrowserDialog();  
41.   
42.            folderBrowserDialog1.Description = "请选择文件路径";  
43.   
44.            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)  
45.            {  
46.                this.txtFolder.Text = folderBrowserDialog1.SelectedPath;  
47.            }  
48.   
49.            fileObjectPath = this.txtFolder.Text.Trim();  
50.        }  
51.   
52.        private void btnAbsoluteDelete_Click(object sender, EventArgs e)  
53.        {  
54.            this.lblHint.Visible = true;  
55.   
56.            if(string.IsNullOrEmpty(fileObjectPath))  
57.            {  
58.                MessageBox.Show("请选择要粉碎的文件和文件夹！");  
59.   
60.                return;  
61.            }  
62.   
63.            AbsoluteFile dfile = new AbsoluteFile();  
64.   
65.            dfile.DeleteErrorEvent += new EventHandler(Dfile_DeleteErrorEvent);  
66.   
67.            if (isFile)  
68.            {  
69.                dfile.FinishDeleteFileEvent += new EventHandler(Dfile_FinishDeleteFileEvent);  
70.   
71.                dfileThread = new Thread(new ParameterizedThreadStart(dfile.DoAbsoluteDeleteFile));  
72.   
73.                dfileThread.IsBackground = true;  
74.   
75.                dfileThread.Start(fileObjectPath);  
76.            }  
77.            else  
78.            {  
79.                dfile.FinishDeleteFolderEvent += new EventHandler(Dfile_FinishDeleteFolderEvent);  
80.   
81.                dfileThread = new Thread(new ParameterizedThreadStart(dfile.DoDeleteFolder));  
82.   
83.                dfileThread.IsBackground = true;  
84.   
85.                dfileThread.Start(fileObjectPath);  
86.            }  
87.   
88.            this.lblHint.Text = @"正在删除...";  
89.        }  
90.   
91.        void Dfile_DeleteErrorEvent(object sender, EventArgs e)  
92.        {  
93.            if (!this.InvokeRequired)  
94.            {  
95.                MessageBox.Show((sender as AbsoluteFile).ErrorString);  
96.            }  
97.            else  
98.            {  
99.                this.BeginInvoke(new DefaulEventDelegate(Dfile_DeleteErrorEvent), new object[] { sender, e });  
100.   
101.            }  
102.        }  
103.   
104.        void Dfile_FinishDeleteFolderEvent(object sender, EventArgs e)  
105.        {  
106.            if (!this.InvokeRequired)  
107.            {  
108.                this.lblHint.Visible = false;  
109.   
110.                MessageBox.Show("删除完毕！");  
111.            }  
112.            else  
113.            {  
114.                this.BeginInvoke(new DefaulEventDelegate(Dfile_FinishDeleteFolderEvent),new object[] { sender,e });  
115.                  
116.            }  
117.        }  
118.   
119.        void Dfile_FinishDeleteFileEvent(object sender, EventArgs e)  
120.        {  
121.            if (!this.InvokeRequired)  
122.            {  
123.                this.lblHint.Visible = false;  
124.   
125.                MessageBox.Show("删除完毕！");  
126.            }  
127.            else  
128.            {  
129.                this.BeginInvoke(new DefaulEventDelegate(Dfile_FinishDeleteFileEvent), new object[] { sender, e });  
130.   
131.            }  
132.        }  
133.    }  

数据粉粹

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原文地址：http://www.cnblogs.com/watchfluture/p/4744035.html