0 1 2 4 8 16,32,64,128,256,512,1024,2048, 4096,8192
--2的n次方 tinyint类型就够用了
--0 无权限
--1 可读(read)
--2 可新增（insert）
--4 可修改（update）
--8 可删除(delete)
--16 可审核
...
权限的组合
read +insert = 1+2=3
read +insert +delete = 1+2+8=11
read + update+delete =1+4+8=13
select 1 | 2 权限的加法 就是逻辑[或]运算 --结果: 3
select 3 & (~1) 权限的减法, 使用[与]运算+[非]运算来实现 --结果: 2
select 1 | 13 一次添加n个权限 --结果: 13
select 13 & (~11) 一次减去n个权限 --结果:4
select (3 & 2) 权限的判断 --结果:2
--例子
Select * From Customer Where ( @Status is null Or [Status] & @Status = [Status])
int[] power = new int[] { 1, 2, 4, 8, 16, 32, 64 };
int value = 126;
for (int i = 0; i < power.Length; i++)
{
if ((value & power[i]) != 0)
{
Console.WriteLine("有power[{0}]={1}所代表的权限", i, power[i]);
}
}
--读取权限
private int[] GetPermission(int PermissionSum)
{
List<int> list = new List<int>();
int[] table = {1,2,4,8,16,32,64};
for (int i = table.Length-1; i >-1; i--)
{
if (table[i] == PermissionSum)
{
list.Add(table[i]);
break;
}
if (table[i] > PermissionSum)
{
continue;
}
PermissionSum -= table[i];
list.Add(table[i]);
}
return list.ToArray();
}
using System.ComponentModel;
public enum ProjectPhase
{
[Description("Requirements Gathering")]
RequirementsGathering = 1,
[Description("Analysis and Design")]
AnalysisDesign = 1,
}
//EnumExtensions
public static string GetEnumDescription(Enum value)
{
FieldInfo fi = value.GetType().GetField(value.ToString());
DescriptionAttribute[] attributes =
(DescriptionAttribute[])fi.GetCustomAttributes(
typeof(DescriptionAttribute),
false);
if (attributes != null &&
attributes.Length > 0)
return attributes[0].Description;
else
return value.ToString();
}
Binding an enumeration to a dropdown list
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Text;
public enum ActiveFrom : int
{
[Description("Now")]
DateOfPurchase = 0,
[Description("Tomorrow")]
OnLogin = 1,
[Description("Day After Tomorrow")]
OnActivation = 2
}
public static class Extensions
{
public static IEnumerable BindWithEnum() where TEnum : struct
{
Type enumType = typeof(TEnum);
Type descriptionAttributeType = typeof(DescriptionAttribute);
List list = new List();
foreach (int value in Enum.GetValues(enumType))
{
MemberInfo enumObj = enumType.GetMember(Enum.ToObject(enumType, value).ToString()).SingleOrDefault();
object attr = enumObj.GetCustomAttributes(descriptionAttributeType, false).SingleOrDefault();
if (attr == null) continue;
string description = ((DescriptionAttribute)attr).Description;
list.Add(new { Code = value, Name = description });
}
return list;
}
}
//Pick a Random Enum in C# (Better than my old post)
static T RandomEnum() {
if ( typeof( T ).IsEnum ) {
var names = Enum.GetNames( typeof( T ) );
return ( T )Enum.Parse( typeof( T ), names[ threadsafeRandom.Value.Next( 0, names.Length ) ] );
}
return default( T );
}
static readonly ThreadLocal threadsafeRandom = new ThreadLocal( () => new Random( RandomSeed() ) );
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
using System.Text;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
string s1 = TextBox1.Text.Trim();
TextBox2.Text = SetBase64Str(TextBox1.Text);
}
//解密
internal static string GetBase64Str(string text1)
{
byte[] bytes = Convert.FromBase64String(text1);
return Encoding.Unicode.GetString(bytes, 0, bytes.Length);
}
//加密
internal static string SetBase64Str(string text)
{
string result = Convert.ToBase64String(System.Text.Encoding.Unicode.GetBytes(text));
return result;
}
//乱码
internal static string A(string text)
{
string str = "";
for (int i = 0; i < text.Length; i++)
{
str = str + ((char)(0xff - ((byte)text[i])));
}
return str;
}
protected void Button2_Click(object sender, EventArgs e)
{
// string strPage = HttpContext.Current.Request.AppRelativeCurrentExecutionFilePath;
string strPage = TextBox3.Text.Trim();
// if (!CheckMasterPower(strPage.Substring(strPage.LastIndexOf("/") + 1)))
if (!CheckMasterPower(strPage))
{
Alert("Sorry! 您没有此项【操作权限】！");
}
else
{
Alert("成功！");
}
}
public void Alert(string msg)
{
HttpContext.Current.Response.Write("<script>alert(\"" + msg + "\");</script>");
}
public bool CheckMasterPower(string A_1)
{
if (A_1.ToLower() == "main.aspx")
{
return true;
}
string[, ,] strArray = SystemArray();
int length = strArray.GetLength(0);
for (int i = 0; i < length; i++)
{
int num3 = strArray.GetLength(2);
for (int j = 1; j < num3; j++)
{
if (strArray[i, 0, j] == null)
{
break;
}
if (strArray[i, 0, j].ToLower().IndexOf(A_1.ToLower()) > -1)
{
return this.IsHasPower(i.ToString() + j.ToString());
}
}
}
return false;
}
public bool IsHasPower(string A_1)
{
// return ((HttpContext.Current.Session["UserPower"] != null) && (("," + HttpContext.Current.Session["UserPower"].ToString() + ",").IndexOf("," + A_1 + ",") > -1));
return ((("," + TextBox4.Text.Trim() + ",").IndexOf("," + A_1 + ",") > -1));
}
public string[, ,] SystemArray()
{
string[, ,] strArray = new string[6, 8, 8];
strArray[0, 0, 0] = "系统配置";
strArray[0, 1, 0] = "系统信息";
strArray[0, 0, 1] = "MWebConfig.Aspx";
strArray[0, 2, 0] = "公司信息";
strArray[0, 0, 2] = "MCompany.Aspx";
strArray[0, 3, 0] = "系统重启";
strArray[0, 0, 3] = "Reset.Aspx";
strArray[0, 4, 0] = "统计图标";
strArray[0, 0, 4] = "MStatLogo.Aspx";
strArray[0, 5, 0] = "邮件服务";
strArray[0, 0, 5] = "MStmp.Aspx";
strArray[0, 6, 0] = "网站导航";
strArray[0, 0, 6] = "Navigate.Aspx";
strArray[1, 0, 0] = "网站管理";
strArray[1, 1, 0] = "站点列表";
strArray[1, 0, 1] = "MWebList.Aspx";
strArray[2, 0, 0] = "账户管理";
strArray[2, 1, 0] = "管理员管理";
strArray[2, 0, 1] = "Master.aspx";
strArray[2, 2, 0] = "用户管理";
strArray[2, 0, 2] = "MUserList.Aspx";
strArray[3, 0, 0] = "信息管理";
strArray[3, 1, 0] = "网站公告";
strArray[3, 0, 1] = "MNotify.aspx";
strArray[3, 2, 0] = "新闻聚焦";
strArray[3, 0, 2] = "MNews.aspx";
strArray[3, 3, 0] = "用户反馈";
strArray[3, 0, 3] = "MMessage.aspx";
strArray[4, 0, 0] = "网站广告";
strArray[4, 1, 0] = "广告管理";
strArray[4, 0, 1] = "MFrendLick.aspx|MSponsorLink.aspx|MAdImg.aspx|MAdCode.aspx";
strArray[5, 0, 0] = "技术员专区";
strArray[5, 1, 0] = "系统运行";
strArray[5, 0, 1] = "ShowAppRuned.aspx";
strArray[5, 2, 0] = "源数据";
strArray[5, 0, 2] = "ShowDatabase.aspx";
strArray[5, 3, 0] = "缓存数据";
strArray[5, 0, 3] = "ShowCache.aspx";
strArray[5, 4, 0] = "作业情况";
strArray[5, 0, 4] = "ShowTask.aspx";
strArray[5, 5, 0] = "程序报错";
strArray[5, 0, 5] = "ShowError.aspx";
strArray[5, 6, 0] = "升级参考";
strArray[5, 0, 6] = "ShowConsult.aspx";
strArray[5, 7, 0] = "活跃指数";
strArray[5, 0, 7] = " ShowActive.aspx";
return strArray;
}
//生成权限列表
protected void Button3_Click(object sender, EventArgs e)
{
this.ltrPowerList.Text = GetMasterPowerList("01,02,03,04,05,06,11,21,22,31,32,33,41,51,52,53,54,55,56,57");
}
public string GetMasterPowerList(string admin_power)
{
return PowerList(admin_power);
}
public string PowerList(string admin_power)
{
string[, ,] strArray = this.SystemArray();
admin_power = "," + admin_power + ",";
StringBuilder builder = new StringBuilder();
builder.Append("<table width='98%' cellpadding='5' cellspacing='0' border='0' >");
for (int i = 0; i < strArray.GetLength(0); i++)
{
builder.Append("<tr><td height=25 class=forumRowHighlight colspan=2 align=left><strong>" + strArray[i, 0, 0] + "</strong></td></tr>");
builder.Append("<tr><td height=20 class=forumrow colspan=2 align=left>");
for (int j = 1; j < strArray.GetLength(1); j++)
{
if (strArray[i, j, 0] == null)
{
break;
}
builder.Append(" <input type=checkbox class='checkbox' name='website_power' value=" + i.ToString() + j.ToString() + ",");
if (admin_power.IndexOf("," + i.ToString() + j.ToString() + ",") > -1)
{
builder.Append(" checked");
}
builder.Append(">" + i.ToString() + j.ToString() + "." + strArray[i, j, 0]);
if ((j % 5) == 0)
{
builder.Append("<br><br>");
}
}
builder.Append("</td></tr>");
}
builder.Append("</table>");
return builder.ToString();
}
}
