fac-dotnet-with-dylan

"Dotnet with Dylan" sessions at Founders and Coders

Session 1: .NET Fundamentals

Background

What is .NET anyway? https://dotnet.microsoft.com/en-us/
Just enough history (and why the history sticks)
C#, F#, VB.NET -
- https://www.statista.com/statistics/793628/worldwide-developer-survey-most-used-languages/
- https://www.tiobe.com/tiobe-index/

Our First .NET App

dotnet new console.

Console.WriteLine()

Variables - use console.readline to store the user's name.

String interpolation

Methods

Collections and loops

Understanding Types

Exercise: Build a calculator

Your program should ask the user to enter two numbers, and then display the sum of those numbers.

C:\dotnet\Calculator>dotnet run
Enter first number:
23
Enter second number:
45
23 + 45 = 68

Somebody will probably end up with 23 + 45 = 2345
Introduce Int32.Parse

Exercise: build a better calculator

Your program should ask the user to enter a simple equation, or enter quit if they're finished calculating.

Your program should support four operations: addition (+), multiplication (*), division (/) and subtraction (-).

Tip: String.Split will break a string into substrings

C:\dotnet\BetterCalculator>dotnet run calc
Enter expression:
23+45
Sorry, I can't parse that expression. (Did you put spaces around the operator?)

Enter expression:
23 + 45
Result: 23 + 45 = 68

Enter expression:
15 / 3
Result: 15 / 3 = 5 

Enter expression:
quit
Bye!

Classes and objects

Create a class representing a Car
Make, model, doors, engine size, colour, year of first registration
Colours: introduce enumerations
Build a big old list of cars

Create a PricingEngine - this can be static.

Introduce LINQ:

Where - find all the red cars
OrderBy - most expensive cars first
GroupBy
First
Sum

Exercise: