Section 1
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purpose of properties
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Last updated
6 years ago
Date created
Mar 1, 2020
Cards (56)
Section 1
(50 cards)
purpose of properties
to modify or report the state of an object
Everything is inherited except
constructors
UML for static
<<static class>> underline static member
base keyword
represents an instance of the base class
Unit
smallexsft testable piece of code (one method/event)
Base class constructors must
always be invoked in the derrived class
instances of a class have the same
behaviours and attributes
static classes can't...
be instantiated/contain constructiors
UML for properties
<<property>> <<read/write only>>
invoking properties is done
contextually
Class
encapsulation of data and logic into one cohesive unit
member of a static class
msut be static
unhandled exceptions
abend the program
UML for abstract
italics
Base Class
the class being extended
Static class are
utility classes
String Pool
a table that contains a single reference to each unique literal string declared
Exceptions
an error or unexpected error when executing a statment
Exceptions are
objects
stack trace
exception property contains info re: where, what method, what value
naming convention
public Uppercase, private lowercase
Anatomy of a class
attributes, behaviours, constructors
All objects derrive from
System.Object
units of code are tested in
isolation
tier
one part of an application
auto implemented properties are used when
implemenetation contains no logic
A class with an abstract method
must be abstract
overloaded constructor must be
the first statment
ToString for currency
{:c}
Method overriding
a derrived class can provide it's own implementation for an inherited method
3 tier architecture
business, presentation, data
steps for execptions
1) construct instance of exception 2) throw exception 3) catch exception
Methods and properties of abstract classes
have no implementation, the MUST be implemented in the derrived class
Abstract class
a base class that is so generic it cannot be instantiated.
Derrived class
the class extending another class
Source code compiles to
CIL Common intermediary language
steps in coding a class
1. Using 2. Namespace 3. Class 4. Fields 5. Base Constructor 6. Overloaded Constructor 7. Properties 8. To String
.NET is what kind of framework
extensible (we can extend the abilities of classes
2 parts of an assembly
.exe executable, .dll dynamically linked library
flow control
try {} catch{}
CIL compiles to
*CLR Common Language Runtime
UML representation of derrives
open arrow head
Enumerations are
a 0-indexed collection of integer constants
classes can derive from
only one class
Polymorphism
a base variable may reference a derrived type A polymorphic operation has many implementations
file types
.sln solution, .cs c# source code, .suo solution user options, .csproj visual studio project, .resx resource file, config application configuration
instances of a class have their own
state
what kind of methods can be overridden
virtual
Inheritance
a class can be used to model other classes (blueprint)
An abstract class may
have non abstract members
Section 2
(6 cards)