[",wryhddeh.3BXBST~~}T~~Y76F.BB.PF(BPZCECEEP77F[CCKXS}T~~}T~~","Clone."," In science fiction movies cloning is a common plot. It usually ends badly. And in the C# language, the Clone method and ICloneable interface are available. But using these features is confusing and not recommended. ","Interface ","interface","Example."," This program does the opposite of what is recommended. It uses Clone, on a string array. The Array type implements ICloneable and the Clone call results in a copied array. When we change the cloned array, the original is unchanged. ","String Array ","array","ins","class","adsbygoogle","data-ad-client","ca-pub-4712093147740724","data-ad-slot","6227126509","data-ad-format","auto","ins","class","adsbygoogle","data-ad-client","ca-pub-4712093147740724","data-ad-slot","6227126509","data-ad-format","auto","C# program that uses Clone","\n\nusing System;\n\nclass Program\n{\n static void Main()\n {\n string[] array = { \"dot\", \"net\", \"perls\" };\n string[] cloned = array.","Clone","() as string[];\n\n Console.WriteLine(string.Join(\",\", array));\n Console.WriteLine(string.Join(\",\", cloned));\n Console.WriteLine();","\n\n // Change the first element in the cloned array.\n ","cloned[0] = \"element\";\n\n Console.WriteLine(string.Join(\",\", array));\n Console.WriteLine(string.Join(\",\", cloned));\n }\n}\n\n","Output","\n\ndot,net,perls\ndot,net,perls\n\ndot,net,perls\nelement,net,perls","In this example,"," we used an as-cast to change the type of the reference returned by Clone. This is needed because Clone returns an object. An explicit cast, such as (string[]), could instead be used. ","As ","as","Casts ","cast","Example 2."," Next we consider the implementation of Clone. In the IL of the above program, the Array.Clone static method is called. In mscorlib, where System.Array resides, Array.Clone calls into MemberwiseClone. ","Clone method call: IL","\n\nIL_0022: callvirt instance object [mscorlib]System.Array::Clone()\n\n","System.Array implementation: IL","\n\nIL_0001: call instance object System.Object::MemberwiseClone()","Also,"," System.Array implements the System.ICloneable interface. This is how the virtual execution engine knows to pass a call to Clone to the System.Array type. The Clone method is abstract and virtual. ","IL ","il","System.ICloneable interface: IL","\n\n.method public hidebysig newslot abstract virtual\n instance object Clone() cil managed\n{\n} // end of method ICloneable::Clone","Example 3."," You must never run this example code. It does something that is not recommended\u2014it implements ICloneable. The Rock class implements ICloneable, and defines the Clone() public method. ","Next: ","We create a new instance of the Rock class with its public constructor. We pass three arguments to it.","Constructor ","constructor","Finally: ","We invoke the Clone method on the first Rock instance and cast its result. We call Console.WriteLine\u2014this calls ToString.","Console.WriteLine ","console","ToString ","tostring","C# program that implements ICloneable","\n\nusing System;\n\nclass Rock : ICloneable\n{\n int _weight;\n bool _round;\n bool _mossy;\n\n public Rock(int weight, bool round, bool mossy)\n {\n this._weight = weight;\n this._round = round;\n this._mossy = mossy;\n }\n\n public object ","Clone","()\n {\n return new Rock(this._weight, this._round, this._mossy);\n }\n\n public override string ToString()\n {\n return string.Format(\"weight = {0}, round = {1}, mossy = {2}\",\n this._weight,\n this._round,\n this._mossy);\n }\n}\n\nclass Program\n{\n static void Main()\n {\n Rock rock1 = new Rock(10, true, false);\n Rock rock2 = rock1.","Clone","() as Rock;\n\n Console.WriteLine(\"1. {0}\", rock1);\n Console.WriteLine(\"2. {0}\", rock2);\n }\n}\n\n","Output","\n\n1. weight = 10, round = True, mossy = False\n2. weight = 10, round = True, mossy = False","Discussion."," As noted in Framework Design Guidelines, Clone has some problems. The main issue is the question of shallow and deep copies. ICloneable does not define which kind of cloning is done. ","So: ","The developers using Clone are left guessing. This negates the whole point of interfaces, which is to define contracts.","And: ","This makes using ICloneable and Clone almost as problematic as cloning in science fiction movies.","The contract of ICloneable does not specify the type of clone implementation required to satisfy the contract.... Consumers cannot rely on ICloneable to let them know whether an object is deep-copied or not. Therefore we recommend that ICloneable not be implemented.","Framework Design Guidelines","Summary."," We explored the Clone method and ICloneable interface. It is hard to use this interface correctly. In may be impossible to use correctly, due to a weakness in its contract. Instead using custom methods is perhaps clearer. 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