using System.IO;

using System.Security.Cryptography;

using System.Collections;

using System.Windows.Forms;

 IDataObject iData = Clipboard.GetDataObject();

   if (iData.GetDataPresent(DataFormats.Text))

   {

string filepath=(string)iData.GetData(DataFormats.Text);

StringBuilder sbMD5= new StringBuilder(1024);

string filepath=@"C:\tmp";

DirectoryInfo dir = new DirectoryInfo((filepath.LastIndexOf(Path.DirectorySeparatorChar) == filepath.Length - 1) ? filepath : filepath + Path.DirectorySeparatorChar);

FileSystemInfo[] fileArr = dir.GetFileSystemInfos();

Queue<FileSystemInfo> Folders = new Queue<FileSystemInfo>(dir.GetFileSystemInfos());

while (Folders.Count > 0)

    FileSystemInfo atom = Folders.Dequeue();

    FileInfo f = atom as FileInfo;

    if (f == null)

    {

        DirectoryInfo d = atom as DirectoryInfo;

        foreach (FileSystemInfo fi in d.GetFileSystemInfos())

            Folders.Enqueue(fi);

    }

    else

    {

        FileStream fs = new FileStream(f.FullName,FileMode.Open,FileAccess.Read);

        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

        byte [] md5byte = md5.ComputeHash(fs);

        int i,j;

        StringBuilder sb = new StringBuilder(16);

        foreach (byte b in md5byte)

        {

        　   i = Convert.ToInt32(b);

        　　 j = i >> 4;

        　　 sb.Append(Convert.ToString(j,16));

        　　 j = ((i << 4) & 0x00ff) >> 4;

        　　 sb.Append(Convert.ToString(j,16));

        }

        sbMD5.Append(f.FullName);

        sbMD5.Append("\t");

        sbMD5.Append(sb.ToString());

        sbMD5.Append("\r\n");

    }

Clipboard.SetText(sbMD5.ToString());

   }

   else

    MessageBox.Show("目前剪贴板中数据不可转换为文本","错误");