DIFF。在单例类和静态类之间 [英] Diff. between singleton class and static class

问题描述

大家好，


什么是差异。在C＃中的单例类和静态类之间？

Hi All,

What is the diff. between a singleton class and a static class in C#?

推荐答案

静态类不允许任何东西创建自己的实例

除了它自己 - 它没有公共ctors：


class T

{

private T（） {}


public static T Get（）{return new T（）; }

};


T t1 = new T（）; //错误，没有公共构造函数

T t2 = T.Get（）; // Ok

T t3 = T.Get（）; // 好;返回T的另一个实例

单身人士只允许创建一个类的实例：


class S

{

private S（）{}


private static S instance = new S（）;


public static S Get（）{return S.instance; }

};


S s1 = new S（）; //错误，没有公共构造函数

S s2 = S.Get（）; // 好;总是返回相同的实例

S s3 = S.Get（）; // 好;返回与s2相同的实例


" DBA"写道：

A static class does not allow an instance of itself to be created by anything
other than itself - it has no public ctors:

class T
{
private T() { }

public static T Get() { return new T(); }
};

T t1 = new T(); // Error, no public constructor
T t2 = T.Get(); // Ok
T t3 = T.Get(); // Ok; returns another instance of T

A singleton allows only one instance of the class to ever be created:

class S
{
private S() { }

private static S instance = new S();

public static S Get() { return S.instance; }
};

S s1 = new S(); // Error, no public constructor
S s2 = S.Get(); // Ok; always returns the same instnace
S s3 = S.Get(); // Ok; returns the same instance as s2


"DBA" wrote:

大家好，

什么是差异。单例类和C＃中的静态类之间？

Hi All,

What is the diff. between a singleton class and a static class in C#?

DBA< DB*@discussions.microsoft.com>写道：

DBA <DB*@discussions.microsoft.com> wrote:

什么是差异。单例类和C＃中的静态类之间？

What is the diff. between a singleton class and a static class in C#?

单例允许访问单个创建的实例 - 该实例

（或者更确切地说） ，对该实例的引用）可以作为参数

传递给其他方法，并作为普通对象处理。


静态类只允许静态方法。


-

Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet

如果回复群组，请不要给我发邮件

A singleton allows access to a single created instance - that instance
(or rather, a reference to that instance) can be passed as a parameter
to other methods, and treated as a normal object.

A static class allows only static methods.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

首先目前没有办法声明一个类静态，你通过声明静态的所有成员来隐含地实现
。只要Appdomain这样做，成员就会存在
。


单身是一个正常的唯一的区别是

构造函数是私有的，因此是创建的唯一方法。一个实例正在使用

返回实例的属性/方法。如果需要，你也可以声明

a方法来处理实例，所以当需要

时它可以重新创建。

欢呼，

-

Ignacio Machin，

ignacio.machin at dot.state.fl.us

Florida交通部


" DBA" < DB*@discussions.microsoft.com>在消息中写道

新闻：D4 ********************************** @ microsof t.com ...

Hi,

first the currently there is no a way to declare a class static, you do it
implicitely by declaring static all the members of it. The members will
exist as long as the Appdomain does.

A singleton is a "normal" class with the only difference that the
constructor is private, hence the only way to "create" an instance is using
the property/method that return the instance. If needed you can also declare
a method that dispose the instance, so it can be recreated again when
needed.
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"DBA" <DB*@discussions.microsoft.com> wrote in message
news:D4**********************************@microsof t.com...

大家好，

什么是差异。单例类和C＃中的静态类之间？

Hi All,

What is the diff. between a singleton class and a static class in C#?

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