book

VB.NET Language in a Nutshell, Second Edition

by Steven Roman PhD, Ron Petrusha, Paul Lomax

April 2002

Intermediate to advanced

688 pages

19h 51m

English

O'Reilly Media, Inc.

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Getting a VB Program to RunConsole ApplicationsWindows Forms Applications
Events: The Starting PointWindows Forms eventsASP.NET eventsEvent argumentsCalling Routines from Event HandlersWriting Custom ProceduresFunctionsSub proceduresProperty proceduresControlling Execution FlowCalling sub and function proceduresSetting and retrieving property values
VariablesVariable ScopeLocal variables: block-level and procedure-level scopeModule-level and project-level scopePrivate accessFriend accessPublic accessVariable LifetimeStatic variables
Value and Reference TypesVB Data Types: A SummarySimple Data Types in Visual BasicBoolean data typeByte data typeChar data typeDate data typeDecimal data typeDouble data typeInteger data typeLong data typeObject data typeShort data typeSingle data typeString data typeStructure data type: user-defined typesData Type Conversion
Definition of ArrayDimension of an ArraySize of an ArrayArrays in VB.NETRedimensioning arrays
Late Binding Versus Early Binding
Passing ArgumentsPassing ObjectsOptional ArgumentsParamArray
Why Learn Object-Oriented Techniques?
AbstractionEncapsulationInterfaces
Class Modules in VB.NETClass MembersThe Public Interface of a VB.NET ClassObjectsPropertiesInstance and Shared MembersClass ConstructorsFinalize, Dispose, and Garbage Collection
Permission to InheritOverridingRules of InheritanceMyBase, MyClass, and MeShadowing
Interfaces Revisited
OverloadingPolymorphism
Member InheritanceMember Accessibility
Namespaces
The System NamespaceData Type ConversionThe Array ClassThe Math ClassThe String Class
System.CollectionsSystem.DataSystem.IOSystem.Text.RegularExpressionsSystem.Windows.Forms
DelegatesUsing a Delegate to Call a MethodUsing a Delegate as a Function Pointer
Control-Related EventsWithEventsAddHandler and RemoveHandler
Syntax and Use
Error Detection and Error Handling
Unstructured Error HandlingThe Err objectDealing with runtime errorsIn-line error handlingCentralized error handlingNo enabled error-handlerStructured Exception HandlingTry...Catch...FinallyException classes
Detecting Logical ErrorsWhere to Handle a Logical ErrorHandling the error on the spotHandling the error in the offending procedure’s error handlerPassing the error to the calling procedure
Language Changes for VB.NETData TypesStringsInteger/Long data type changesVariant data typeOther data type changesVariables and Their DeclarationVariable declarationVariable initializationVariable scope changesArrays and array declarationsStructure/user-defined type declarationsBoolean and Bitwise OperatorsChanges Related to ProceduresCalling a procedureDefault method of passing argumentsOptional argumentsReturn statementPassing property parameters in proceduresParamArray parametersMiscellaneous Language ChangesLine numbersOn GoToWhileGoSub and Return statements
ConstantsString FunctionsEmptinessGraphical FunctionalityMathematical FunctionalityDiagnosticsMiscellaneous
InheritanceOverloadingObject CreationPropertiesDefault propertiesProperty declarations
Array Handling
Data Type ConversionOther Conversion
Object ProgrammingMiscellaneous Programming
Arithmetic Operators
The Is OperatorThe Like Operator
Visual Basic Intrinsic Constants
AppWinStyle EnumerationCallType EnumerationCompareMethod EnumerationDateFormat EnumerationDateInterval EnumerationDueDate EnumerationFileAttribute EnumerationFirstDayOfWeek EnumerationFirstWeekOfYear EnumerationMsgBoxResult EnumerationMsgBoxStyle EnumerationOpenAccess EnumerationOpenMode EnumerationOpenModeTypes EnumerationOpenShare EnumerationTriState EnumerationVariantType EnumerationVbStrConv Enumeration
Compiler Basics
Output Filename and File TypeInput FilesResourcesCode GenerationDebuggingErrors and WarningsLanguageMiscellaneousAdvanced

Content preview from VB.NET Language in a Nutshell, Second Edition

Name

RSet Function

Class

Microsoft.VisualBasic.Strings

Syntax

RSet(Source, Length)

Source (required; String): The string to be right aligned
Length (required; Integer): The length of the returned string

Return Value

String

Description

Right aligns a string

Rules at a Glance

If the length of Source is greater than or equal to Length, the function returns only the leftmost Length characters.
If the length of Source is less than Length, spaces are added to the left of the returned string so that its length becomes Length.

VB.NET/VB 6 Differences

In VB 6, RSet was implemented as a kind of assignment statement. Because it is implemented as a function in VB.NET, its syntax is completely different.
In VB 6, RSet could be used only with fixed-length strings. In VB.NET, RSet works with all CTS String data.