設計模式 State Pattern

下面示例**中，模擬context有兩個狀態，concretestatea與concretestateb，當context呼叫request()方法，觸發concretestatea轉移為concretestateb。

/*

*state pattern
*  */
using system;
using system.collections.generic;
namespace pattern03
}abstract
class
state
class
concretestatea
:state
}class
concretestateb
:state
}class
context
public
state state
set}
public
void
request()
}}

/*

* state pattern
*/using system;
using system.collections;
namespace pattern02
}/// 
/// state
/// 
abstract
class
state
set}
public
double balance
set}
public
abstract
void
deposit
(double amount)
;public
abstract
void
withdraw
(double amount)
;public
abstract
void
payinterest()
;}class
redstate
:state
public
redstate
(account account,
double balance)
private
void
initialize()
public
override
void
deposit
(double amount)
public
override
void
withdraw
(double amount)
public
override
void
payinterest()
private
void
statechangecheck()
}}class
silverstate
:state
public
silverstate
(double balance,
account account)
private
void
initialize()
public
override
void
deposit
(double amount)
public
override
void
withdraw
(double amount)
public
override
void
payinterest()
private
void
statechangecheck()
else
if(balance > upperlimit)}}
class
goldstate
:state
public
goldstate
(double balance,
account account)
private
void
initialize()
public
override
void
deposit
(double amount)
public
override
void
withdraw
(double amount)
public
override
void
payinterest()
private
void
statechangecheck()
else
if(balance < lowerlimit)}}
/// 
/// context class
/// 
class
account
// properties
public
double balance
}public
state state
set}
public
void
deposit
(double amount)
--- "
, amount)
;            console.
writeline
(" 當前餘額 = "
,this
.balance)
;            console.
writeline
(" 賬戶狀態 = "
,this
.state.
gettype()
.name)
;            console.
writeline(""
);}public
void
withdraw
(double amount)
--- "
, amount)
;            console.
writeline
(" 當前餘額 = "
,this
.balance)
;            console.
writeline
(" 賬戶狀態 = \n"
,this
.state.
gettype()
.name);}
public
void
payinterest()
",this
.balance)
;            console.
writeline
(" 賬戶狀態 = \n"
,this
.state.
gettype()
.name);}
}}

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