OOP #19

toop

We learned about properties in C#. in the second part of the class we learned about interfaces in C#. we investigated objects using: is, as, null key-words

invsab

More topics covered:

- static class and static ctor
- properties access modifiers, backing field, abstraction
- marker interface
- interface inheritance
- interface default access modifiers
- is, as
- null

Links:

OOP #18

toop

We learned about the Encapsulation in OOP which is implemented by the six access modifiers for data and methods (public, private, protected, internal, protected-internal, private-protected [requires c# 7.2]) and the three modifiers for class (public, internal, private), how to add-reference from one project to another, Getters/Setters, for-each loop

modifiers2

UML:

access

More topics covered:

- What are modifiers?
- How to install c# 7.2
- How to compile to c# 7.2
- Default access modifiers (class/data/functions)
- ILDASM “private ansi” is actual internal for class
- private class
- Circular reference between projects
- Creating two projects and add reference > solution
- Using Setters to filter wrong data (i.e. negative height)
- Static data could be used as configuration
- Avoid repetition of values by using a bool[ ] array

Links:

21 NOV 2019

toop

We learned about static-data, static-methods, const, read-only, class data fields initialization step

Constantvsreadonly

static

More topics covered:

- How to access static/const
- Access static using a derived class
- Creating static methods – design considerations
- Const is replaced during compilation
- Using static/const fields to define an array size
- .NET Object class static methods
- Static method can only call another static method

Links:

OOP #16

toop

virtual

We learned about ctor overloading, method overloading, using this keyword to call from one ctor to another, using this keyword to refer to class data fields, calling specific base ctor by using base key word, class Object, virtual methods

More topics covered:

- All classes inherit from Object class
- Using this.[field-name] in ctor, for example:
  Person(int id) { this.id = id; }
- : this , for example:
  Person(int id) { this.id = id; }
  Person(int id, string name) :
  this(id) { this.name = name }
- : base , for example:
  Person(int id) { this.id = id; }
  Employee : Person
  Employee(int id, string name) :
  base (id) { this.name = name }
- Creating our own custom virtual methods
- +Override our own custom virtual methods
- Virtual vs. abstract
- Passing arguments to console application using Command Prompt
- Adding readme.txt into GITHUB folder

Links:

OOP #15

toop

ildasm

We learned about Common Intermediate Language (CIL), IL Disassembler (ILDASM.exe), IL Assembler (ILASM.exe), Class Constructors, default Constructor

More topics covered:

Adding ILDASM to Visual Studio 2017 Tools menu
Investigating our .NET class code using ILDASM
ctor key-word
Creating few ctors in the same class
Debug/Release configuration
Bin/Debug + Bin/Release folders
Creating auto generated constructor in Visual Studio 2017
Command Prompt (CMD)
Running our Console Application using the Command Prompt
Users: guest, user, administrator
Converting executable .net file (.exe) to Intermediate Language (IL) using ildasm.exe
Modifying Intermediate Language (IL) code using notepad
Converting Intermediate Language (IL) back to executable .net file (.exe) using ilasm.exe, and run it again

Links:

18 NOV 2019

toop

We learned about inheritance, abstract classes, abstract methods, calling base.ToString(), class inside another class, array of classes, class as parameter type of a method

More topics covered:

Creating nested new: derived class inside parent class
Creating method which accepts a parent base class (shape). this allows you to send any derived class (i.e. circle, rectangle)
Abstract class – usually adding “Base” postfix, i.e. ShapeBase
Creating array of classes, create new items of each class inside
Polymorphism

Links:

14 NOV 2019

toop We learned about the Object Oriented Programming (OOP) concept. we learned about classes, objects, data, functionality, inheritance, abstract, new, ToString

More topics covered:

Creating new Class
override ToString()
[DebuggerDisplay]
Object Initializer

Links:

Winforms #12

We developed together in class a File Explorer which could open images, open text files and color labels
We learned how to create MessaegBox which shows buttons – and handle the option the user has selected in the message box

More topics covered:

Menu-Strip
Color-Dialog
Open-File-Dialog
Loading a file into a picture Bitmap
Loading text file into a list of strings (very advanced, not required in this module)

Links:

Winforms #11

simon

We developed together in class a Simon game – where the computer plays random colors and you have to repeat them (be careful: one wrong color and your out!)
We learned about the UI thread and creating a new worker thread
We learned about global scope of variables
We learned about Thread.Sleep
We learned how to create MessaegBox using: MessageBox.Show(…);
We learned about WinForm theory, and Mono project

More topics covered:

Using const, i.e. const int MAX = 4
Setting Colors using Color., i.e. Color.Red
Setting Text/Colors from the Form1.Designer.cs
new Thread(() =>
{
// put your code here
}).Start();
WinForm Framework theory – .NET versions, GDI, popularity, usage, …, read here: Winform PDF
Mono cross-platform, read more about it here: Mono Project

Links:

Winforms #10

We built a chat Application (like Whatsapp, is typing …)
We learned how to add ListBox and more events into our WinForm application.

More topics covered:

ListBox (Add item, get count, set focus)
KeyPress event: whenever the user clicked on keyboard inside TextBox
KeyDown: here we can detect ENTER key [KeyValue == 13]
Leave: whenever the user left the TextBox
How to print the current Date-Time
How to convert Integer into String , i.e. x.ToString()

Links: