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Make use of this keyword in c# to call one constructor from another constructor To call a constructor which is present in parent class make use of base keywordExampleTo call a constructor which is present in another class make use of base keywordclass DemoBase{ public DemoBase(int firstNumber, int secondNumber, int thirdNumber){ System.Console.WriteLine("Base class Constructor"); System.Console.WriteLine($"{firstNumber} {secondNumber} {thirdNumber}"); } } class Demo : DemoBase{ public Demo(int firstNumber, int secondNumber, int thirdNumber) : base(firstNumber, secondNumber, thirdNumber){ System.Console.WriteLine("Derived class Constructor"); System.Console.WriteLine($"{firstNumber} {secondNumber} {thirdNumber}"); } } class Program{ ... Read More
In c#, Destructor is a special method of a class and it is used inside a class to destroy the object or instances of classes.There can be only one destructor inside a classFollowing are the properties of destructor in c#Destructors will not take any parametersDestructors will begin with a tilde symbol(~)Destructors (~) cannot be defined in Structs.Destructor cannot be called. They are invoked automatically.Destructor implicitly calls Finalize on the base class of object.Exampleclass Demo{ ~Demo(){ //Finalizer // cleanup statements... } } class Program{ static void Main(){ Console.ReadLine(); } }The finalizer ... Read More
Select operator produces one result value for every source SelectMany Operator belong to Projection Operators category. It is used to project each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence.Exampleclass Demo{ public string Name { get; set; } public List Contents { get; set; } public static ListGetAllContents(){ List listContents = new List{ new Demo{ Name = "Cap", Contents = new List { "Nike", "Adidas" } }, ... Read More
Here in the example a static Demo class is created and a static variable count is declared.Here the count variable is treated as a global variable .so it keeps on increasing in the example ,because only one instance of the class is createdExamplestatic class Demo{ public static int count; static Demo(){ System.Console.WriteLine("Static Constuctor called"); } } class Program{ static void Main(){ Demo.count++; Demo.count++; System.Console.WriteLine(Demo.count); Console.ReadKey(); } }OutputStatic Constuctor called 2
Make use of this keyword in c# to call one constructor from another constructorTo call a constructor which is present in parent class make use of base keywordExampleclass Demo{ public Demo(){ System.Console.WriteLine("Parameter less constructor called"); } public Demo(int firstNumber, int secondNumber) : this(){ System.Console.WriteLine($"{firstNumber} {secondNumber}"); } public Demo(int firstNumber, int secondNumber, int thirdNumber) : this(firstNumber, secondNumber){ System.Console.WriteLine($"{firstNumber} {secondNumber} {thirdNumber}"); } } class Program{ static void Main(){ Demo obj = new Demo(1, 2, 3); Console.ReadLine(); } }OutputParameter less ... Read More
Static constructor are called automatically before the first instance is created or any static members are referenced.A static constructor is used to initialize any static data, or to perform a particular action that needs to be performed once only.In c#, only one static constructor is allowed to createStatic constructors have the following properties −A static constructor does not take access modifiers or have parameters.A class or struct can only have one static constructor.Static constructors cannot be inherited or overloaded.A static constructor cannot be called directly and is only meant to be called by the common language runtime (CLR). It is ... Read More
Tuples are used when you want to return multiple values from a method without using ref or out parameters.Tuples are used to pass multiple values to a method through a single parameter. Tuples can also be nested togetherExamplePassig Tuples as a Parameterclass Program{ static void DisplayTupleValues(Tuple dummy){ Console.WriteLine($"Id = { dummy.Item1}"); Console.WriteLine($"Value1 = { dummy.Item2}"); Console.WriteLine($"Value2 = { dummy.Item3}"); } static void Main(){ var dummy = Tuple.Create(1, "Dummy", "Tuple"); DisplayTupleValues(dummy); Console.ReadLine(); } }OutputId = 1 Value1 = Dummy ... Read More
In C# 5.0 and before to give an value to the Auto Property we have to do in the constructorThe constructor will be automatically called when class is instantiated and the value will be setAfter C#5.0 a new way to give a value to auto property has come which is similar in assigning a value to the variableExampleSet Value in Constructor class Demo{ public Demo(){ FirstName = "DemoName"; } public string FirstName { get; set; } } class Program{ static void Main(){ Demo obj = new Demo(); ... Read More
In c# multiple values can be returned using the below approaches −Reference parametersOutput parametersReturning an ArrayReturning a TupleReference parametersExampleclass Program{ static int ReturnMultipleValuesUsingRef(int firstNumber, ref int secondNumber){ secondNumber = 20; return firstNumber; } static void Main(){ int a = 10; int refValue = 0; var res = ReturnMultipleValuesUsingRef(a, ref refValue); System.Console.WriteLine($" Ref Value {refValue}"); System.Console.WriteLine($" Function Return Value {res}"); Console.ReadLine(); } }OutputRef Value 20 Function Return Value 10Output parametersExampleclass Program{ static ... Read More
Interface methods are contract with the outside world which specifies that class implementing this interface does a certain set of things.Interface members are always public because the purpose of an interface is to enable other types to access a class or struct.Interfaces can have access specifiers like protected or internal etc. Thus limiting 'the outside world' to a subset of 'the whole outside world'.Exampleinterface IInterface{ void Save(); } class Program{ static void Main(){ Console.ReadLine(); } }The above example will compile properly without any errorsPrior to C# 8, interface members were public by default. In ... Read More