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();
}
http: //www.cnblogs.com /zhuqil /archive / 2010 / 04 / 02 /Permission.html
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(); }
本文转自曾祥展博客园博客，原文链接：http://www.cnblogs.com/zengxiangzhan/archive/2010/10/06/1844845.html，如需转载请自行联系原作者
