c-jumpstart module 3.pdf
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03 | Features of C#, Part 2Jerry Nixon | Microsoft Developer EvangelistDaren May | President & Co-founder, Crank211
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Controlling Programmatic Flow Manipulating Types and Strings
Module Overview
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MVA
Controlling Programmatic Flow
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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
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Selection statements evaluate Booleanexpressions and direct execution If statements can be nested within otherif statements.
Selection Statements : if
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The ternary or conditional operator canbe used as if statement shorthand.
Selection Statements :ternary
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Switch (008)
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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
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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
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Foreach loop iterates over each elementin an enumerable object Array, Collection, List
Iteration Statements: foreach
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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
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Iteration, break and continue (010)
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MVA
Manipulating Types
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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
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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
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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
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Casting Demo
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MVA
Manipulating Strings
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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?
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StringBuilder (012)
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The string class provides manymethods for manipulating strings Bear in mind that new stringobjects are returned for:
Replace
ToUpper
Concat
String Manipulation
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Regular expressions are a specialized syntax to find apatterns in strings
Regular Expressions
M d l R
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Controlling Programmatic Flow Manipulating Types and Strings
Module Recap
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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