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(1, { New, "Joydip", "Kanjilal"), (2, New, "Dean", "Jones"), (3, New, "Steve", Id, "Smith") }; Console.Read();}Use Target Typing WithConditional Operators In C# 9, With C# 9 It Is Now Possible ToInfer Types Using Conditional Operators. Consider The Person Class GivenBelow:, Public Class Person { Private Int Id { Get; Set; }Private String Firstname { Get; Set; } Private String Lastname { Get;Set; } Public Person(Int, FirstName, String, Id, String LastName) { Id = Id; FirstName = FirstName; LastName= LastName; } }, Assume That There Are Two Types Of Workers -- AnEmployee And A Consultant. Here Are The Two Classes That Represent AnEmployee And A Consultant:, Public Class Employee : Person {Private String Department { Get; Set; } Public Employee(Int, LastName, String, Base(id, String Department) :, FirstName, Id, Lastname) { Department = Department; } } Public ClassConsultant : Person { Private Int Rateperhour { Get; Set; } PublicConsultant(Int, RatePerHour, Int, Base(id, String LastName) :, 9, Lastname) { Rateperhour = Rateperhour; } }, TheFollowing Code Will Compile In C#, Employee(1, But Will Not Compile In Earlier Versions OfC#:, Employee Employee = New, "Kanjilal", Consultant(1, "Development");Consultant Consultant =New, 150, Example, "Kanjilal");Person Person = Employee ??Consultant; //Compilation Error Prior To C# 9, C# 9Lets You Use Target-Typed Conditional Operators In TernaryStatements., Use Covariant Return Types In C#9, Covariant Return Types Is A Feature That Enables You ToOverride A Method Of A Base Class With A Method In The Derived Class ToReturn A More Specific Type. Earlier Versions Of C# Did Not AllowReturning A Different Type (Than Its Base Version) In An OverriddenMethod Of A Derived Class. This Changes In C#9., For, A, Suppose You Have Two Classes A And B And That The LatterExtends The Former. If You Have A Virtual Or Abstract Method InClass, However, You Can Override It In Class B. You Can Do This BecauseThe C# Programming Language Provides Support For Run-Time PolymorphismOr Late Binding, 9, Until C#, Id, You Could Not Change The Return Type Of The OverriddenMethod In The Derived Class., Let'S UnderstandThis With An Example. Consider The Updated Version Of The Person ClassGiven Below., Public Class Person { Private Int Id { Get; Set; }Private String Firstname { Get; Set; } Private String Lastname { Get;Set; } Public Person() { } Public Person(Int, Id, String Lastname) { Id = Id; Firstname = Firstname; Lastname= Lastname; } Public Virtual Person Getperson() { Return New Person(); }}, Note We'Ve Added A Virtual Method And A DefaultConstructor. Here We Are Returning An Instance Of The Person Class FromThe Getperson Method By Calling The Person Class'S DefaultConstructor., Now Consider The Employee Class GivenBelow:, Public Class Employee : Person { Private StringDepartment { Get; Set; } Public Employee() { } PublicEmployee(Int, Interestingly, LastName) { Department = Department; } PublicOverride Employee GetPerson() { Return New Employee(); } }, AndWe'Ve Added A Default Constructor Here Too. Here An Instance Of TheEmployee Class Is Being Returned By The GetPerson Method That OverridesThe Employee Class, Delegates, The Return Type Of The Getperson Method Is EmployeeIn The Employee Class., Note That The Above Code WouldNot Compile In C# Versions Before C# 9 Because You'Re ConstrainedTo Use The Same Signature For Your Overridden Methods In A DerivedClass., Covariance And Contravariance Are Longtime C#Features (Added With C# 4.0) That Provide A Polymorphic ExtensionTo, Arrays, Specified, And Generics. Covariance Enables You To Use A MoreDerived Type (More Specific) Than Originally, Const, While Contravariance Enables You To Use A Less DerivedType (Less Specific). You Can Learn More About Covariance AndContravariance From , Microsoft'S OnlineDocumentation., How To Do More In C#:, How To Use Top-Level Programs In C#9, How To Use Pattern Matching InC#, How To Work With Read-OnlyCollections In C#, How To Work WithStatic Anonymous Functions In C# 9, How To Work With Record Types InC#, How To Use Implicit AndExplicit Operators In C#, Singleton Vs. Static Classes InC#, How To Log Data To TheWindows Event Log In C#, How To Use ArrayPool And MemoryPoolIn C#, How To Use The Buffer Class InC#, How To Use HashSet InC#, How To Use Named AndOptional Parameters In C#, How To Benchmark C# Code UsingBenchmarkDotNet, How To Use FluentInterfaces And Method Chaining In C#, How To Unit Test Static Methods InC#, How To Refactor God Objects InC#, How To Use ValueTask InC#, How To Use Immutability InC#, How To Use, Readonly, Tue, And Static InC#, How To Use Data Annotations InC#, How To Work With GUIDs In C#8, When To Use An AbstractClass Vs. Interface In C#, How To Work With AutoMapper InC#, ]]>, Kanjilal, 30 Mar 2021 03:00:00 -0700, and Joydip