Chapter 6 - Building Your Own Types with Object-Oriented Programming
by Mark J. Price
C# 7 and .NET Core
- C# 7 and .NET Core: Modern Cross-Platform Development - Second Edition
- C# 7 and .NET Core: Modern Cross-Platform Development - Second Edition
- Credits
- About the Author
- About the Reviewer
- www.PacktPub.com
- Customer Feedback
- Preface
- 1. Hello, C#! Welcome, .NET Core!
- Choosing your development environment
- Installing Microsoft Visual Studio 2017 for Windows
- Installing Microsoft Visual Studio Code for Windows, macOS, or Linux
- Understanding .NET
- Writing and compiling code using the .NET Core CLI tool
- Writing and compiling code using Microsoft Visual Studio 2017
- Writing and compiling code using Microsoft Visual Studio Code
- Managing source code with GitHub
- Practicing and exploring
- Summary
- 2. Speaking C#
- Understanding C# basics
- Declaring variables
- Building console applications
- Operating on variables
- Practicing and exploring
- Summary
- 3. Controlling the Flow, Converting Types, and Handling Exceptions
- 4. Using .NET Standard Types
- Using assemblies and namespaces
- Storing and manipulating text
- Storing data with collections
- Internationalizing an application
- Practicing and exploring
- Summary
- 5. Debugging, Monitoring, and Testing
- 6. Building Your Own Types with Object-Oriented Programming
- Talking about OOP
- Building class libraries
- Storing data with fields
- Writing and calling methods
- Controlling how parameters are passed
- Splitting classes using partial
- Controlling access with properties and indexers
- Practicing and exploring
- Summary
- 7. Implementing Interfaces and Inheriting Classes
- Setting up a class library and console application
- Simplifying methods with operators
- Defining local functions
- Raising and handling events
- Implementing interfaces
- Managing memory with reference and value types
- Inheriting from classes
- Casting within inheritance hierarchies
- Inheriting and extending .NET types
- Practice and explore
- Summary
- 8. Working with Databases Using the Entity Framework Core
- 9. Querying and Manipulating Data with LINQ
- 10. Working with Files, Streams, and Serialization
- 11. Protecting Your Data
- 12. Improving Performance and Scalability with Multitasking
- 13. Building Universal Windows Platform Apps Using XAML
- 14. Building Web Applications Using ASP.NET Core MVC
- Understanding ASP.NET Core
- Exploring an ASP.NET Core MVC web application
- ASP.NET Core MVC controllers
- ASP.NET Core MVC models
- ASP.NET Core MVC views
- Taking ASP.NET Core MVC further
- Practicing and exploring
- Summary
- 15. Building Mobile Apps Using Xamarin.Forms and ASP.NET Core Web API
- Understanding Xamarin.Forms
- Building services using ASP.NET Core Web API and Visual Studio Code
- Building mobile apps using Xamarin.Forms and Visual Studio for Mac
- Creating a Xamarin.Forms project
- Creating a model
- Creating an interface for dialing phone numbers and implement for iOS and Android
- Creating views for the customers list and customer details
- Test the mobile app with iOS
- Adding NuGet packages for calling a REST service
- Getting customers from the service
- Practicing and exploring
- Summary
- 16. Packaging and Deploying Your Code Cross-Platform
- A. Answers to the Test Your Knowledge Questions
- Chapter 1 - Hello, C#! Welcome, .NET Core!
- Chapter 2 - Speaking C#
- Chapter 3 - Controlling the Flow, Converting Types, and Handling Exceptions
- Chapter 4 - Using .NET Standard Types
- Chapter 5 - Debugging, Monitoring, and Testing
- Chapter 6 - Building Your Own Types with Object-Oriented Programming
- Chapter 7 - Implementing Interfaces and Inheriting Classes
- Chapter 8 - Working with Databases Using Entity Framework Core
- Chapter 9 - Querying and Manipulating Data with LINQ
- Chapter 10 - Working with Files, Streams, and Serialization
- Chapter 11 - Protecting Your Data
- Chapter 12 - Improving Performance and Scalability with Multitasking
- Chapter 13 - Building Universal Windows Platform Apps Using XAML
- Chapter 14 - Building Web Applications Using ASP.NET Core MVC
- Chapter 15 - Building Mobile Apps Using Xamarin.Forms and ASP.NET Core Web API
- Chapter 16 - Packaging and Deploying Your Code Cross-Platform
- What are the four access modifiers and what do they do?
private: This modifier makes a member only visible inside the class.internal: This modifier makes a member only visible inside the class or within the same assembly.protected: This modifier makes a member only visible inside the class or derived classes.public: This modifier makes a member visible everywhere.
- What is the difference between the
static,const, andreadonlykeywords?static: This keyword makes the member shared by all instances and accessed through the type.const: This keyword makes a field a fixed literal value that should never change.readonly: This keyword makes a field that can only be assigned at runtime using a constructor.
- How many parameters can a method have?
- A method with 16383 parameters can be compiled, ran, and called. Any more than that and an unstated exception is thrown at runtime. IL has predefined opcodes to load up to four parameters and a special opcode to load up to 16-bits (65,536) parameters. A best practice is to limit your methods to three or four parameters. You can combine multiple parameters into a new class to encapsulate them into a single parameter. You can find more information on this at http://stackoverflow.com/questions/12658883/what-is-the-maximum-number-of-parameters-that-a-c-sharp-method-can-be-defined-as
- What does a constructor do?
- A constructor allocates memory and initializes field values.
- Why do you need to apply the
[Flags]attribute to anenumtype when you want to store combined values?- If you don't apply the
[Flags]attribute to anenumtype when you want to store combined values, then a storedenumvalue that is a combination will return as the stored integer value instead of a comma-separated list of text values.
- If you don't apply the
- Why is the partial keyword useful?
- You can use the
partialkeyword to split the definition of a type over multiple files.
- You can use the
-
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