using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Security.Cryptography;

namespace Wpfbinding

{

    class DES

    {

        DESCryptoServiceProvider des;

        public DES()

        {

            des = DESCryptoServiceProvider.Create() as DESCryptoServiceProvider;

            des.IV = des.Key;

        }

        public string Key

        {

            get { return Convert.ToBase64String(des.Key); }

            set { des.Key = Convert.FromBase64String(value); }

        }

        // 加密字符串

        public string Encode(string sInputString)

        {

            byte[] data = Encoding.UTF8.GetBytes(sInputString);

            ICryptoTransform desEncrypt = des.CreateEncryptor();

            byte[] result = desEncrypt.TransformFinalBlock(data, , data.Length);

            return Convert.ToBase64String(result);

        }

        // 解密字符串

        public string Decode(string sInputString)

        {

            byte[] data = Convert.FromBase64String(sInputString);

            ICryptoTransform desDecrypt = des.CreateDecryptor();

            byte[] result = desDecrypt.TransformFinalBlock(data, , data.Length);

            return Encoding.UTF8.GetString(result);

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace Wpfbinding

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

            testc();

        }

        void testc()

        {

            DES des = new DES(); string str = "测试,Hello Word";

            textBlock1.Text = str;

            textBlock2.Text = des.Encode(str);

            textBlock3.Text = des.Decode(des.Encode(str));

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Security.Cryptography;

namespace Wpfbinding

{

    class DES

    {

　　　　public string strKey = "";

　　　　public string strIV = "Edward.K";

　　　　public string Encrypt(string _strQ)

　　　　{

    　　　　byte[] buffer = Encoding.UTF8.GetBytes(_strQ);

   　　　　 MemoryStream ms = new MemoryStream();

   　　 　　DESCryptoServiceProvider tdes = new DESCryptoServiceProvider();

  　　 　　 CryptoStream encStream = new CryptoStream(ms, tdes.CreateEncryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strIV)), CryptoStreamMode.Write);

   　　　　 encStream.Write(buffer, , buffer.Length);

   　　　　 encStream.FlushFinalBlock();

    　　　　return Convert.ToBase64String(ms.ToArray()).Replace("+", "%");

　　　　}

　　　　public string Decrypt(string _strQ)

　　　　{

   　　　　 _strQ = _strQ.Replace("%", "+");

    　　　　byte[] buffer = Convert.FromBase64String(_strQ);

    　　　　MemoryStream ms = new MemoryStream();

    　　　　DESCryptoServiceProvider tdes = new DESCryptoServiceProvider();

   　　 　　CryptoStream encStream = new CryptoStream(ms, tdes.CreateDecryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strIV)), CryptoStreamMode.Write);

    　　　　encStream.Write(buffer, , buffer.Length);

   　　　　 encStream.FlushFinalBlock();

   　　 　　return Encoding.UTF8.GetString(ms.ToArray());

　　　　}

    }

}