the c derived class calls the base class constructor

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1、Thec#derivedclasscallsthebaseclassconstructorIt'svery,verythin.Thedefaultconstructorinthisarticlereferstothesystem'sdefaultnon-parametricconstructorwithoutwritingaconstructorWhenyoudon'twriteyourownconstructorinthebaseclass,thedefaultconstructorofthecallbaseclassisderiv

2、edbythederivedclassEx:PublicclassMyBaseClass{}PublicclassMyDerivedClass:MyBaseClass{PublicMyDerivedClass(){TheConsole.WriteLine("I'masubclassnon-parametricconstructor");}PublicMyDerivedClass(intI){TheConsole.WriteLine("I'maconstructorforaparameter");}PublicMyDerivedClas

3、s(intI,intj){Console.WriteLine("I'maconstructorfortwoparameters");}}Whenaderivedclassisinstantiated,thebaseclassdefaultconstructoriscalled2,writeconstructorasbaseclass,thederivedclassdoesnotspecifywhichconstructorisinvoked,willbelookingforano-parameterconstructor,ifther

4、eisnoerror,theotherbyanycallwhichinaderivedclassconstructorislookingforthebaseclassconstructor,noargumentsratherthanparametermatching.Ex:PublicclassMyBaseClass{PublicMyBaseClass(intI){TheConsole.WriteLine("Iamaconstructorwithaparameter");}}PublicclassMyDerivedClass:MyBa

5、seClass{PublicMyDerivedClass(){TheConsole.WriteLine("I'masubclassnon-parametricconstructor");}PublicMyDerivedClass(intI){TheConsole.WriteLine("I'maconstructorforaparameter");}PublicMyDerivedClass(intI,intj){Console.WriteLine("I'maconstructorfortwoparameters");}}Whenthed

6、erivedclassisinstantiated,theerrorisreportedTheconstructoriswritteninthebaseclass,andthederivedclasscanspecifyaconstructorthatinvokesthebaseclass,usingthebasekeyword.TheExPublicclassMyBaseClass{PublicMyBaseClass(intI){TheConsole.WriteLine("Iamaconstructorwithaparameter"

7、);}}PublicclassMyDerivedClass:MyBaseClass{PublicMyDerivedClass():base(I){TheConsole.WriteLine("I'masubclassnon-parametricconstructor");}PublicMyDerivedClass(intI):base(I){TheConsole.WriteLine("I'maconstructorforaparameter");}PublicMyDerivedClass(intI,intj):base(I){Conso

8、le.WriteLine("I'maconstructorfortwoparameters");}}Whenyouinstantiateaderivedclasswithaconstructorthattakesapar