c-jumpstart module 3.pdf

7/27/2019 C-Jumpstart Module 3.pdf

1/24

03 | Features of C#, Part 2Jerry Nixon | Microsoft Developer EvangelistDaren May | President & Co-founder, Crank211


2/24

Controlling Programmatic Flow Manipulating Types and Strings

Module Overview


3/24

MVA

Controlling Programmatic Flow


4/24

Many statements impact program flow:

Selection statements if, else, switch

Iteration statements do, for, foreach, in, while

Jump statements

break, continue, default, goto, return, yield

Controlling Flow


5/24

Selection statements evaluate Booleanexpressions and direct execution If statements can be nested within otherif statements.

Selection Statements : if


6/24

The ternary or conditional operator canbe used as if statement shorthand.

Selection Statements :ternary


7/24

Switch (008)


8/24

while and do-while statements executea body of code if the expressionevaluates to true. while evaluates the expression before

executing the body, so the body mayexecute 0 or more times.

do-while evaluates the expression after thefirst execution of the body, so the body

executes at least once

Iteration Statements: while, do-while


9/24

for loops are similar to while loops for loops include clauses that executebefore the loop begins and after everyiteration:

Initialization clause typically used toinitialize one of more loop variables

Iteration clause typically used to update

the loop variable

Iteration Statements: for


10/24

Foreach loop iterates over each elementin an enumerable object Array, Collection, List

Iteration Statements: foreach


11/24

Jump statements redirect execution

breakends a loop or exits a switch continue skips a loop iteration and starts the next iteration

goto transfers execution to a position marked by a label

return exits a method

throwraises an exception

Jump Statements


12/24

Iteration, break and continue (010)


13/24

MVA

Manipulating Types


14/24

Casting allows us to work with types in a general sensbase object or as an instance of an interface impleme

We can explicitly attempt to cast an object to anothe An advantage of strong typing is that the compiler often k

cast is possible. It doesnt always know.

Compilation will fail if the compiler detects an invalid cast.

But, what about scenarios that the compiler cant det

Casting Types


15/24

In this scenario, instances of Class2 andClass3 can be cast an instance of Class1. However, an instance of Class2 cannever be cast to Class3. If Class2 is cast to Class1, can it then becast to Class3?

Casting Types


16/24

C# provides us with the is operator

returns true if an object is an instance of a type The as operator attempts to cast an object to a speci

returning the instance cast to the type

null if not possible

does not raise an exception

Is and As


17/24

Casting Demo


18/24

MVA

Manipulating Strings


19/24

A string object is an immutable (unchangeable) sequcharacters.

Any method that manipulates a string, actually returnstring. The StringBuilder class provides a mutable implemen

string.

What is a string?


20/24

StringBuilder (012)


21/24

The string class provides manymethods for manipulating strings Bear in mind that new stringobjects are returned for:

Replace

ToUpper

Concat

String Manipulation


22/24

Regular expressions are a specialized syntax to find apatterns in strings

Regular Expressions

M d l R


23/24

Controlling Programmatic Flow Manipulating Types and Strings

Module Recap


24/24

2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, Office, Azure, System Center, Dynamics and other product names are or may be registered trathe U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee tprovided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTA

c-jumpstart module 3.pdf

Documents