WINDOWS 7 KEITH ELDER A walk through of features of lucky # 7.
Keith Elder Microsoft MVP
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Transcript of Keith Elder Microsoft MVP
AssumptionsI assume you
Have 1 – 2 years of programming experienceUnderstand the basic concepts of
Variables Loops Arrays
Can type over 40 words per minute
Very Simple ProgramA C# program
requires one Main method. This is the entry point to the
program.
All code is held within
a class.
Blocks of code are represented
with curly braces {}.
Each line ends with a semi-colon;
C# is a strongly typed
language.
C# is an object oriented language
class MyFirstProgram{ static void Main() { int x = 5; int y = 10; int z = x + y; }}
C# Quick Facts
Breaking Down C# - NamespaceNamespaceAbstract container
providing organization to items.
Typically organized by:CompanyProductTeamSub-TeamEtc.
Namespace
Class
Method1
Method2
Properties(data)
Breaking Down C# - Namespacenamespace SkunkWorks{ public class Loan { public decimal LoanAmount { get; set; } public bool IsApproved { get; set; } }}
namespace Vendor{ public class Loan { public decimal LoanAmount { get; set; } public bool IsApproved { get; set; } public int CreditScore { get; set; } }}
Breaking Down A C# - ClassA class is just a blue
print for an object.An object is an allocated
region of storage.An object doesn’t exist
until memory is allocated.
A class holds data (properties/fields) and is made up of one or more methods (functions) .
Namespace
Class
Method1
Method2
Properties(data)
Breaking Down C# – Class / Propertiesnamespace SkunkWorks{ public class Loan { public decimal LoanAmount { get; set; } public bool IsApproved { get; set; } }} Loan myLoan = new Loan();
When an instance of a Loan is created in memory, this becomes an object. Thus the variable myLoan is an object.
Properties
Class
Breaking Down C# - MethodThink of methods as
actions that classes can perform.
Take a function, put it in a class, we call it a method.
C# doesn’t allow functions to live and breathe outside of a class. Thus, all we have is methods.
Methods can access other methods within the class and properties, and call other methods in other classes.
public class Loan { public decimal LoanAmount { get; set; } public bool IsApproved { get; set; }
public void MarkApproved() { IsApproved = true; OnMarkedApproved(); } }
Putting it all together
namespace ConsoleApplication{ class Program { static void Main() { Loan myLoan = new Loan(); myLoan.LoanAmount = 1000000; } }}
Using statements specify which Namespaces to use to resolve classes.
using System;using Vendor;
Supported C# TypesC# type keywords .Net Framework Typebool System.Boolean
byte System.Byte
sbyte System.Sbyte
char System.Char
decimal System.Decimal
double System.Double
float System.Single
int System.Int32
unit System.UInt32
long System.Int64
ulong System.UInt64
object System.Object
short Sysytem.Int16
ushort System.UInt16
string System.String
Strings must be in quotesCorrect Incorrect
string x = “foo bar”;
string x = foo bar;
TIP: If foo is declared as a variable of type string this is legal.
If / Elseif (expression){ } else{
}
if (expression){ } else if (expression){
} else{
}
int x = 5;if (x > 5){ x = 10; } else{ x = 0;}
TIP: If you only have one line in your if block, you can skip the curly braces.
int x = 5;If (x % 2 == 0) CallSomeMethod();
Commenting Code// single lines/// for
summaries/* */ block
//int x = 5;
/// <summary> /// This is what kicks the program off. /// </summary> /// <param name="args"></param> static void Main(string[] args) { }
/* this is a comment */
OperatorsC# uses standard mathematical operators
+, -, /, *, <, >, <=, >=, Expression operators
&&||==!=
Assignment operators=, +=, *=, -=, *=
http://msdn.microsoft.com/en-us/library/6a71f45d.aspx
Who can see what?Public means that anyone can access itPrivate means that only other members can
access it
public class Loan { public decimal LoanAmount { get; set; } public bool IsApproved { get; set; } private bool DocsCompleted { get; set; } }
Static KeywordCan be used with
FieldsMethods,PropertiesOperatorsEventsConstructorsCannot be used with indexers and
desconstructors
LoopsForeach loopsFor loopsWhile loops
foreach (var item in collection){ Console.WriteLine(item.Property); }
for (int i = 0; i < length; i++){ Console.WriteLine(i);}
while (expression) // x < 5{ }
TIP: Use code snippets to stub these out.