作者:slightboy,时间:2006-10-14

首发于:http://cs.alienwave.cn/Topic/329.aspx

看到好多同学权限判断都是用字符串然后或分割或截取

其实对于允许/不允许(true/false)这种的权限,用逻辑运算再恰当不过了

声明下:本文针对入门和为掌握的同学,如果已经懂了那可以无视了

可能意思表达的不是很清楚,敬请原谅.

逻辑运算符介绍:

And:逻辑与

0And0=0

0And1=0

1And0=0

1And1=1

Or:逻辑或

0Or0=0

0Or1=1

1Or0=1

1Or1=1

Xor:异或

0Xor0=1

0Xor1=1

1Xor0=1

1Xor1=1

Not:逻辑非

Not1=0

Not0=1

表达方式介绍:

1表示ture,0表示false

举二位为例

第一位表示Read的权限,第二位表示Write的权限,可以表示一下四种权限

00Read(false)Write(false)

01Read(true)Write(false)

10Read(false)Write(true)

11Read(true)Write(true)

运算方式介绍:

还是继续上面的例子

Read=01(1),Write=10(2)

00(0)AndRead=0

01(1)AndRead=Read

10(2)AndRead=0

11(3)AndRead=Read

00(0)AndWrite=0

01(1)AndWrite=0

10(2)AndWrite=Write

11(3)AndWrite=Write

下面给出示例代码:

权限定义类(要有枚举类型该多好啊...)

ClassPermissionTypePublicReadPublicWritePublicDeletePrivateSubClass_InitializeRead=1Write=2Delete=4EndSubEndClass

权限类

ClassPermissionSetComponentPrivateintValuePublicPropertyGetRead()Read=GetValue(Permission.Read)EndPropertyPublicPropertyLetRead(arg)CallSetValue(Permission.Read,arg)EndPropertyPublicPropertyGetWrite()Write=GetValue(Permission.Write)EndPropertyPublicPropertyLetWrite(arg)CallSetValue(Permission.Write,arg)EndPropertyPublicPropertyGetDelete()Delete=GetValue(Permission.Delete)EndPropertyPublicPropertyLetDelete(arg)CallSetValue(Permission.Delete,arg)EndPropertyPublicPropertyGetValue()Value=intValueEndPropertyPublicPropertyLetValue(arg)intValue=argEndPropertyPublicFunctionGetValue(intType)GetValue=(ValueandintType)=intTypeEndFunctionPublicSubSetValue(intType,boolValue)IF(boolValue)ThenValue=ValueOrintTypeElseValue=ValueAnd(NotintType)EndIFEndSubEndClass

运用示例代码:

DimPermission:SetPermission=newPermissionTypeDimPermissionSet:SetPermissionSet=newPermissionSetComponentPermissionSet.Value=0w("Read:")PermissionSet.Read=falsew(PermissionSet.Value&""&PermissionSet.Read)PermissionSet.Read=truew(PermissionSet.Value&""&PermissionSet.Read)w("Write:")PermissionSet.Write=falsew(PermissionSet.Value&""&PermissionSet.Write)PermissionSet.Write=truew(PermissionSet.Value&""&PermissionSet.Write)w("Delete:")PermissionSet.Delete=falsew(PermissionSet.Value&""&PermissionSet.Delete)PermissionSet.Delete=truew(PermissionSet.Value&""&PermissionSet.Delete)Functionw(o)Response.Write("<br/>"&o)EndFunction

今天的课程就到这里,大家可以举一反三,下课...