字 典 加 密

一、在网站项目中添加公共类endecode.cs

代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.Text;

/// 

/// endecode 的摘要说明
/// 
public class endecode
{
	public endecode()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
	}
    public static string encodedecodestr(string code,bool flag)
    {
        string restr = string.Empty;
        string[] keymin = {"math","computer","physical","Chinese" };//数组来字典存储
        string[] keypwd = {"3602","8431","4179","3806" };
        string oldkey = string.Empty;
        string newkey = string.Empty;
        for (int i = 0; i < keymin.Length;i++ )
        {
            if (flag == true)
            {
                oldkey = keymin[i];
                newkey = keypwd[i];
            }
            else 
            {
                oldkey = keypwd[i];
                newkey = keymin[i];
            }
            code = code.Replace(oldkey,newkey);
        }
        restr = code;
        return restr;
    }
}

二、创建pwddic窗体

设计前端界面：

                                        

运行结果：

加密显示：

 

解密显示：

后台pwddic.aspx.cs代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Security.Cryptography;


public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
   
    protected void Button1_Click(object sender, EventArgs e)
    {
        TextBox2.Text =reversetstr(endecode.encodedecodestr(TextBox1.Text.Trim(),true));
        TextBox1.Text=String.Empty;
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        TextBox1.Text = endecode.encodedecodestr(reversetstr(TextBox2.Text.Trim()),false);
        TextBox2.Text = String.Empty;
    }
    public string reversetstr(string codestr) 
    {
        string restr = "";
        char[] arraychar = codestr.ToCharArray();//把一个字符串转化成一个字符数组
        Array.Reverse(arraychar);//把字符数组倒置
        restr = new string(arraychar);//把一个字符数组转化为字符串0
        return restr;
    }
}

这里加密使用数组倒置，加密的时候明文的TextBox1就隐藏，解密的时候TextBox1就显示。