
Delve into .NET development with C#, covering programming fundamentals, object-oriented principles, exception handling, and multithreading. Gain hands-on experience to build cross-platform applications effectively.

csharp.tar.gz

CSharp-Compile-Run-code

.NET is Microsoft’s free and open source framework for developing native software applications on Linux, macOS, and Windows. The power of cross-platform development allows developers to design, code, and run programs on a wide array of platforms.

This course is an introduction to developing .NET applications using C#. You’ll start start with a comprehensive review of C# and computer programming fundamentals: data types, conditionals, loops, methods, and more. You’ll then review the basics of object-oriented programming before diving into methods, exception handling, delegation, and events. With this foundation, you’ll continue building interfaces, collections, database operations, and multithreading. You’ll wrap up with process improvements using dynamic binding, garbage collection, and unmanaged resources.

By the end of this course, you’ll have hands-on experience with C# and .NET, and be ready to build applications using object-oriented programming principles on almost any platform.

Mastering C# and .NET

# Inheritance in interfaces

Classes implement interfaces, but interfaces can derive from other interfaces. Everything we learned about inheritance is applicable to interfaces, except  that iInterfaces can’t be marked as `sealed`. 

There’s no way to prevent interfaces from inheriting from other interfaces. Also, when we implement an interface, we must implement all members that the interface inherited from its base interfaces:

using System;

namespace Interfaces
{
    // Must implement all members that are declared
    // across the chain of inheritance
    public class MultimediaFile : IShareable
    {
        // Method declared in IDownloadable
        public void Download()
        {
            Console.WriteLine("Downloading...");
        }

        public void ShareViaBluetooth()
        {
            Console.WriteLine("Sharing via bluetooth...");
        }

        public void ShareViaCloud()
        {
            Console.WriteLine("Sharing via cloud...");
        }

        public void ShareViaMail()
        {
            Console.WriteLine("Sharing via mail...");
        }
    }
}


namespace Interfaces
{
    // Inherits from IDownloadable
    interface IShareable : IDownloadable
    {
        void ShareViaBluetooth();
        void ShareViaCloud();
        void ShareViaMail();
    }
}

namespace Interfaces
{
    interface IDownloadable
    {
        void Download();
    }
}

namespace Interfaces
{
    class Program
    {
        static void Main(string[] args)
        {
            var multimedia = new MultimediaFile();
            multimedia.Download();
            multimedia.ShareViaBluetooth();
            multimedia.ShareViaCloud();
        }
    }
}

In the code above, `IShareable` inherits from the `IDownloadable` interface. Our `MultimediaFile` class, in turn, implements `IShareable`. Because of the inheritance, `MultimediaFile` must implement both `IShareable` and `IDownloadable`. 

Learn about generic interfaces and inheritance between interfaces.

Getting Started

C# Programming Basics

Classes and OOP

Classes and OOP II

Exception Handling

First Assessment

Delegates and Events

Interfaces

Additional Features

Collections

LINQ

Working with Strings

Working with Dates and Time

Multithreading and Asynchronous Programming

Reflection

Dynamic Binding

Garbage Collection and Unmanaged Resources

Final Assessment

Next Steps

Appendix

Inheritance and Generics in Interfaces

Inheritance in interfaces