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So there is no need for AreaOfTank class to initialize these values. The base class defines a constructor that takes property values as arguments and assigns each value to the correct property. That means Tank() constructor is called and it will initialize the value of Radius and Height in AreaOfTank(). Here AreaOfTank() call base class constructor with the parameter r and h. Public AreaOfTank(string c, double r, double h) : base (r, h)
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But we declare the constructor of AreaOfTank with a base keyword as shown here: When the default constructor isnt present.
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Both the base class and the derived class have their own constructor. A derived class constructor is required to call the constructor from its base class. The Tank class describes the dimension of the tank and AreaOfTank describe the color and the area of the tank. You can use base keyword within instance method, constructor or instance. The radius of tank is :4 and the height of tank is :8Įxplanation: In the above example, Tank is the base class and AreaOfTank is the derived class. In C, base keyword is used to access fields, constructors and methods of base class. Here, argument-list contains arguments that are required by the constructor of the base class. Note: Any form of the constructor defined in the base class can be called by the base keyword, but only that constructor executes that matches the arguments.ĭerived-constructor(parameter-list) : base(argument-list) With the help of base keyword, the derived class can call the constructor which is defined in its base class. To overcome this situation C# provide a keyword known as a base keyword. And Tank class does not contain any constructor so the default constructor is used to instantiate the object of class and AreaOfTank class contains AreaOfTank() constructor which instantiate the object of class.Ĭase 2: In this case, both the base class and derived class has their own constructors, so the process is complicated because the constructors of both classes must be executed. Tank class provides the dimensions of the tank and AreaOfTank provides the color and the area of the tank. The radius of tank is :6 and the height of tank is :12Įxplanation: In the above example Tank is the base class and AreaOfTank is the derived class. Different ways to sort an array in descending order in C#.String.Split() Method in C# with Examples.
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must explicitly call the Base constructor, or provide a lot more stuff on this line to view & verify. In that case, the compiler will not supply the default constructor automatically-you must supply one. The compiler will supply a default constructor automatically unless you have defined any constructor for class 'class1'. This constructor without parameters is called the default constructor. If the constructor for 'class2' does not specify a constructor for 'class1' (as part of 'class2's' header), there must be a constructor class1::class1() for the base class. This class can be the base for many classes that form a hierarchy. When declaring a generic class using a base class constraint, the class name is specified as the constraint. Base class constraint: where T: BaseClass.
Whenever a C++ derived class 'class2' is constructed, each base class 'class1' must first be constructed. then it will be impossible to create an instance of type T in the constructor of the GenClassGo Up to Compiler Errors And Warnings (C++) Index