[" ","aA+CECfCB/B(C|F666966+B(BXBB1B~CPG7666(C*CEEP9G#(CEP666669663","Singleton, static class."," A singleton stores common data in only one place. A static class is also used to store single-instance data. We save state between usages. We store caches to improve performance. The object must be initialized only once and shared. ","Singleton ","singleton","Example."," First you can implement singletons by using language-specific features, such as the static keyword. Our ideal solution is called the singleton design pattern. As you know, a singleton is a single-instance object. ","A singleton can simplify complex code. Singletons have a static property that you must access to get the object reference.","In the example above,"," the member called _instance is a static instance of the SiteStructure class. This means it only can be created once by the runtime. Static members only exist in one place. ","Readonly ","readonly","We use"," this static reference to an actual, regular object. The Instance static property allows easy access to the SiteStructure singleton. This is a public property and is also called a getter. ","Property ","property","A private constructor"," means that a class cannot be created anywhere but inside its own methods. So it must be accessed through the singleton reference. It uses the sealed keyword decoration to improve some optimization options. ","Private Constructor ","constructor","Sealed ","sealed","Static class."," You can make a static class with the static keyword. In the following example, look at how the static keyword is used on the class and constructor. Static classes may be simpler, but the singleton example has many important advantages. ","Static Class ","static","Differences: ","There are important differences between the singleton design pattern and the static keyword on classes.","Static classes and singletons both provide sharing of redundant objects in memory, but they differ in usage and implementation.","Using static classes"," for global data. You can use static classes to store single-instance, global data. The class will usually be initialized lazily, at the last possible moment, making startup faster. ","However: ","You lose control over the exact behavior and static constructors are slow.","Singleton."," Singletons preserve the conventional class approach, and don't require that you use the static keyword everywhere. They may be more demanding to implement at first, but will greatly simplify the architecture of your program. ","Unlike static classes, we can use singletons as parameters to methods, or objects.","Parameters ","parameter","Object ","object","Interfaces."," You can use singletons with interfaces just like any other class. In the C# language, an interface is a contract, and objects that have an interface must meet all of the requirements of that interface.","Reusing the singleton."," Here we can use the singleton on any method that accepts the interface. We don't need to rewrite anything over and over again. These are object-oriented programming best practices. ","You can find more detailed examples on the interface type in the C# language here.","Interface ","interface","Summary."," Singletons allow you to reuse code and control object state much easier. This improves code-sharing, and can result in a far cleaner body of code. With less code, your programs will usually have fewer bugs and will be easier to maintain."]

ELDPYSingleton implementation: C#YDDY/L{<L7>D/L{Sample singleton object.D/L{</L7>DYLBsealed LJSiteStructureD{YDE/L{<L7>DE/L{This is an expensive resource.DE/L{We needLjonly store itLpone place.DE/L{</L7>DEYobject[] _dataLyLqobject[10];YDDE/L{<L7>DE/L{Allocate ourselves.DE/L{We have a L2 constructor, so no one else can.DE/L{</L7>DEYL?readonly SiteStructure _instanceLyLqSiteStructure();YDDE/L{<L7>DE/L{Access SiteStructure.InstanceLjget the singleton object.DE/L{Then call mLgs on that instance.DE/L{</L7>DEYLBL?SiteStructure YInstanceYDE{DEEget { LK _instance; }DE}YDDE/L{<L7>DE/L{This is a L2 constructor, meaning no outsiders have access.DE/L{</L7>DEYL2 SiteStructure()DE{YDEEL{Initialize members here.DEY}D}YStatic LJeLF: C#YDDY/L{<L7>D/L{Static LJeLF. Note the L?keyword usage.D/L{</L7>DYstaticY LBLJSiteStaticD{YDE/L{<L7>DE/L{The data must be a L?memberLpthis eLF.DE/L{</L7>DEYL?object[] _dataLyLqobject[10];YDDE/L{<L7>DE/L{C# doesn't define when this constructor is run, but it will likelyDE/L{be run right beL|e it is used.DE/L{</L7>DEYL?SiteStatic()DE{YDEEL{Initialize all of our L?members.DEY}D}YUsing singleton as parameter: C#YDDY//DL{We wantLjcall a function with this structure as an object.DL{Lka reference from the Instance property on the singleton.D//DYSiteStructure siteLySiteStructure.YInstanceY;DOtherFunction(site);Y L{Use singleton as parameter.YSingletons used with Lzerface: C#YDDY/L{<L7>D/L{Stores signatures of various important mLgs relatedLjthe site.D/L{</L7>DYLBLzerface ISiteInterfaceD{D};YDD/L{<L7>D/L{Skeleton of the singleton that inherits the Lzerface.D/L{</L7>DYLJSiteStructure : ISiteInterfaceD{YDEL{Implements all ISiteInterface mLgs.DEL{Omitted.DY}YDD/L{<L7>D/L{Here is an eLF LJwhere we use a singleton with the Lzerface.D/L{</L7>DYLJTestClassD{YDE/L{<L7>DE/L{Sample.DE/L{</L7>DEYLBTestClass()DE{YDEEL{Send singleton objectLjany function that can take its Lzerface.DEEYSiteStructure siteLySiteStructure.YInstanceY;DEECustomMLg((ISiteInterface)site);DE}YDDE/L{<L7>DE/L{Receives a singleton that adheresLjthe ISiteInterface Lzerface.DE/L{</L7>DEYL2 LcCustomMLg(ISiteInterface LzerfaceObject)DE{YDEEL{Use the singleton by its Lzerface.DEY}D}Y

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