Calling the base constructor in C#

Calling the base constructor in C#

In C#, when you create a derived class that inherits from a base class, you can call the base class constructor using the base keyword.

To call the base constructor, you can use the following syntax in the derived class constructor:

 public class DerivedClass : BaseClass { public DerivedClass() : base() // Call the default constructor of the base class { // Additional code for the derived class constructor } public DerivedClass(int param) : base(param) // Call a parameterized constructor of the base class { // Additional code for the derived class constructor } }

In this example, the DerivedClass constructor calls the base constructor using the base keyword. The : base() syntax calls the default constructor of the base class, while the : base(param) syntax calls a parameterized constructor of the base class that takes a single integer parameter.

It is important to note that if you do not explicitly call a base constructor in the derived class constructor, the default constructor of the base class is called automatically. If the base class does not have a default constructor and you do not call a parameterized constructor explicitly, a compile-time error occurs.

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Examples

  1. "C# calling base constructor from derived class"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass() : base() { // Additional initialization for DerivedClass } }

    Description: Demonstrates calling the base class constructor from the constructor of a derived class using base().

  2. "C# base constructor parameters"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass(int derivedParameter) : base(derivedParameter) { // Additional initialization for DerivedClass } }

    Description: Shows calling a parameterized base constructor from the constructor of a derived class with additional parameters.

  3. "C# calling parameterless base constructor"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass() : base() { // Additional initialization for DerivedClass } }

    Description: Calls the parameterless base constructor from the constructor of a derived class.

  4. "C# calling base constructor with arguments"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass(int derivedParameter) : base("baseParameter", derivedParameter) { // Additional initialization for DerivedClass } }

    Description: Calls a base constructor with arguments from the constructor of a derived class.

  5. "C# calling base constructor in overloaded constructor"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass() : this(42) { // Additional initialization for DerivedClass } public DerivedClass(int derivedParameter) : base("baseParameter", derivedParameter) { // Additional initialization for DerivedClass } }

    Description: Demonstrates calling a base constructor from an overloaded constructor within the same derived class.

  6. "C# calling base constructor with default values"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass() : base("defaultBaseParameter") { // Additional initialization for DerivedClass } }

    Description: Calls a base constructor with default values from the constructor of a derived class.

  7. "C# calling base constructor in static constructor"

    // Code snippet public class DerivedClass : BaseClass { static DerivedClass() { // Static constructor BaseClass.StaticInitialization(); } public DerivedClass() : base() { // Additional initialization for DerivedClass } }

    Description: Calls the base constructor within a static constructor of a derived class.

  8. "C# calling base constructor with dynamic values"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass(string derivedParameter) : base("baseParameter", CalculateDerivedValue(derivedParameter)) { // Additional initialization for DerivedClass } private static int CalculateDerivedValue(string parameter) { // Some logic to calculate derived value return parameter.Length * 2; } }

    Description: Calls a base constructor with dynamically calculated values from the constructor of a derived class.

  9. "C# calling base constructor explicitly"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass() : base() { // Additional initialization for DerivedClass } }

    Description: Explicitly calls the base constructor from the constructor of a derived class.

  10. "C# calling base constructor in conditional initialization"

    // Code snippet public class DerivedClass : BaseClass { public DerivedClass(bool useBaseConstructor) : base(useBaseConstructor ? "baseParameter" : null) { // Additional initialization for DerivedClass } }

    Description: Calls the base constructor conditionally based on a parameter in the constructor of a derived class.

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