VB.NET Language Fundamentals

Section 4: VB.NET Language Fundamentals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Section Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

VB.NET Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],VB.NET statement VB.NET statement

Commenting VB.NET Statements ,[object Object],[object Object],[object Object]

Data Types ,[object Object],[object Object],Intermediate language runtime compilers CTS Execution support, runtime functions Security functionality Boolean Byte Char Double Int16 Int32 Etc. Garbage collection, stack walker, Code manager Class loader, memory layout

Value Types ,[object Object],[object Object],[object Object],[object Object],i = 4 Dim i as Integer = 4

Reference Types ,[object Object],[object Object],[object Object],[object Object],name “ Hello” Dim name as String = “Hello”

Data Types in VB.NET Reference types Value types Object String Array Foo(4) Class Foo Short Char Float Long Integer Byte Boolean Double Enum Enum Foo Structure Foo

Operators in .NET ,[object Object],[object Object],[object Object]

Arithmetic and Assignment Operators Exponentiation assignment ^= Equality = Modulo division Mod Exponentiation ^ Integer division Floating-point division / Multiplication * Subtraction - Addition + Operation Operator Concatenation and assignment &= Integer division assignment Floating-point division assignment /= Subtraction assignment -= Multiplication assignment *= Addition assignment += Operation Operator

Comparison Operators And And String concatenation + Concatenation & Tests to see if obj1 and obj2 refer to same object Is Compares string to pattern Like Greater than or equal to >= Less than or equal to <= Greater than > Operation Operator Or Or Inequality <> Negative for booleans Not Returns the type of an object GetType Returns address of a given procedure AddressOf Xor (bitwise operations) Xor Less Than < Operation Operator

Demonstration ,[object Object],[object Object]

Declaring and Assigning Variables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Variable Scope and Visibility ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Understanding Scope ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Scope global to class Scope local to function

Function vs. Block Scope ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Scope local to function Scope local to looping block

Declaring Constants ,[object Object],[object Object],[object Object],[object Object],[object Object]

Static Variable Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CustomerTotal stays in memory even after the Total() function is exited.

Converting Between Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Preventing Implicit Conversions: Option Strict ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],With Option Strict on, the compiler will catch this potential problem. This may cause loss of data.

Arrays in VB.NET ,[object Object],[object Object],Widget Widget Widget Array of widgets

Declaring Arrays ,[object Object],[object Object],A(0) 1 A(1) 2 A(2) 3 A Dim S() as String = {“Hi”,”There”,”Class”} S(0) S(1) S(2) S “ Hi” “ There” “ Class”

Redimensioning Arrays ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conditional Statements ,[object Object],[object Object],[object Object],[object Object]

If Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Select Case Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Looping Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

For…Next Loops ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Step 1 is the default.

For…Each Loops ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Do…While and Do…Until Loops ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Loop while the condition is true. Loop until the condition is true.

While Loops ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Demonstration ,[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Section Review

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Section Review

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Section Review

VB.NET Language Fundamentals

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VB.NET Language Fundamentals