1 Visual Basic “Whidbey”: Advanced Language and IDE Features Steven Lees, [email protected]...

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Visual Basic “Whidbey”:Advanced Language andIDE FeaturesSteven Lees, [email protected] Silver, [email protected] ManagersMicrosoft Corporation

Session Code: TLS300

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AgendaAgenda

Advanced IDE FeaturesLots of new language featuresFull platform support

Advanced IDE FeaturesLots of new language featuresFull platform support

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Advanced IDE FeaturesAdvanced IDE Features

Application DesignerSettings

Extensible code snippetsRename SymbolNew Async calling convention



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Configuration and SettingsConfiguration and Settings

Basic support in VS 2002 and 2003App.config contains settings in XMLFramework class for reading settingsCan extend with additional capabilities

Straightforward, but not really easy

Basic support in VS 2002 and 2003App.config contains settings in XMLFramework class for reading settingsCan extend with additional capabilities

Straightforward, but not really easy

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Configuration and SettingsConfiguration and Settings

Huge improvements in WhidbeyFramework classes support read/writeStrongly-typed access to settingsIntelliSense for settingsChoose app-scoped or user-scoped settingsWorks in partial trustValidation modelExtensible provider modelShared infrastructure across client and web

Huge improvements in WhidbeyFramework classes support read/writeStrongly-typed access to settingsIntelliSense for settingsChoose app-scoped or user-scoped settingsWorks in partial trustValidation modelExtensible provider modelShared infrastructure across client and web

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Settings ArchitectureSettings Architecture

SettingsBaseSettingsBase

ApplicationSettingsBaseApplicationSettingsBase

WindowsApp1SettingsWindowsApp1Settings

Provider InterfaceProvider Interface

LocalLocalSettingsSettings

RemoteRemote SqlSql CustomCustomAccessAccessCustomCustom

My.SettingsMy.Settings

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CustomizableAt the provider levelBy writing custom settings classes

CustomizableAt the provider levelBy writing custom settings classes

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SettingsSettings

Designer allowsCreating / modifying / deleting entriesType of entry (for strong typing)Choosing user-scoped or app-scopedDefault valueDifferent “profiles”

Special support forConnection StringsWeb service proxiesVS will automatically create settings

Designer allowsCreating / modifying / deleting entriesType of entry (for strong typing)Choosing user-scoped or app-scopedDefault valueDifferent “profiles”

Special support forConnection StringsWeb service proxiesVS will automatically create settings

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App settingsApp settings User SettingsUser Settings

Myapp.exe.config

<applicationSettings>…

</applicationSettings>

fred.config

<userSettings>…

</userSettings>

ethel.config

<userSettings>…

</userSettings>

gladys.config

<userSettings>…

</userSettings>

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Code SamplesCode Samples

Load

Save

Handling events for validation

Load

Save

Handling events for validation

MyMy.Settings.UseHighQuality = .Settings.UseHighQuality = TrueTrue‘ Settings automatically loaded on first access‘ Settings automatically loaded on first access

Private SubPrivate Sub Settings_SettingChanging(ByVal sender Settings_SettingChanging(ByVal sender AsAs Object, Object, ByValByVal e e AsAs SettingsArg) SettingsArg) HandlesHandles MyBaseMyBase.SettingChanging.SettingChanging

IfIf e.SettingName = “SignatureFile” e.SettingName = “SignatureFile” ThenThen If NotIf Not My.Computer.FileSystem.FileExists(e.Setting.Value) My.Computer.FileSystem.FileExists(e.Setting.Value) ThenThen ‘ ‘ Cancel eventCancel event End IfEnd If End IfEnd IfEnd SubEnd Sub

MyMy.Settings.UseHighQuality = .Settings.UseHighQuality = TrueTrueMyMy.Settings.Save().Settings.Save()

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Application DesignerApplication Designer

One stop shopping for app settingsResourcesApp and user settingsReferencesVersion InfoDeployment

Easier to findNon-modal window for better usability

One stop shopping for app settingsResourcesApp and user settingsReferencesVersion InfoDeployment

Easier to findNon-modal window for better usability

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Application DesignerApplication Designer

New Application EventsStartupShutdownUnhandled exceptionNetwork connectedNetwork disconnected

New Application EventsStartupShutdownUnhandled exceptionNetwork connectedNetwork disconnected

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Extensible Code SnippetsExtensible Code Snippets

Code snippets have standard schemaYou can add items to the right-click menuSnippet editor

For creating, editing snippets

Multiple snippet storesLocal or network share

Easy way to package code for reuseSharing is encouraged!

Code snippets have standard schemaYou can add items to the right-click menuSnippet editor

For creating, editing snippets

Multiple snippet storesLocal or network share

Easy way to package code for reuseSharing is encouraged!

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Rename SymbolQuick way to change identifiersRename SymbolQuick way to change identifiers

Rename all cases of “TextBox1”Type declarationVariable declarationsEvents

More precise than text replacementDoesn’t affect commentsWorking on other “refactoring” features

Create method

Rename all cases of “TextBox1”Type declarationVariable declarationsEvents

More precise than text replacementDoesn’t affect commentsWorking on other “refactoring” features

Create method

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Asynchronous callingAsynchronous calling

Easier way to call slow background tasksModel asynchronous calls as events

PictureBox1.LoadAsync(url)PictureBox1_LoadCompleted(…, …)

Completion routine is on main threadWeb service proxiesSupports progress, cancellationBackground worker component

Easier way to call slow background tasksModel asynchronous calls as events

PictureBox1.LoadAsync(url)PictureBox1_LoadCompleted(…, …)

Completion routine is on main threadWeb service proxiesSupports progress, cancellationBackground worker component

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Background WorkerBackground WorkerStructure BackgroundArgsStructure BackgroundArgs Dim arg1 As IntegerDim arg1 As Integer Dim arg2 As StringDim arg2 As StringEnd StructureEnd Structure

Private Sub Button1_Click(…) Handles Button1.ClickPrivate Sub Button1_Click(…) Handles Button1.Click Dim args As BackgroundArgsDim args As BackgroundArgs BackgroundWorker1.RunWorkerAsync(args)BackgroundWorker1.RunWorkerAsync(args)End SubEnd Sub

Private Sub BackgroundWorker1_DoWork(…) Handles Private Sub BackgroundWorker1_DoWork(…) Handles BackgroundWorker1.DoWorkBackgroundWorker1.DoWork ‘ ‘ This is run on a background threadThis is run on a background thread Dim args As BackgroundArgsDim args As BackgroundArgs args = CType(e.Argument, BackgroundArgs)args = CType(e.Argument, BackgroundArgs) ‘ ‘ Now do something on the background threadNow do something on the background thread e.Result = <some object>e.Result = <some object>End SubEnd Sub

Private Sub BackgroundWorker1_RunWorkerCompleted(…) Handles Private Sub BackgroundWorker1_RunWorkerCompleted(…) Handles Background…Background… result = e.Resultresult = e.ResultEnd SubEnd Sub

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Advanced IDE Features

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New Language FeaturesNew Language Features

Explicit array boundsUsing statementContinue statementGlobal keywordAccessor accessibilityPartial typesUnsigned typesOperator OverloadingGenericsWarnings

Explicit array boundsUsing statementContinue statementGlobal keywordAccessor accessibilityPartial typesUnsigned typesOperator OverloadingGenericsWarnings

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Explicit Array BoundsExplicit Array Bounds

Arrays are still zero basedYou can now specify the lower and upper bounds in the declaration

Arrays are still zero basedYou can now specify the lower and upper bounds in the declaration

‘‘In VS 2002 and 2003, you did it this wayIn VS 2002 and 2003, you did it this wayDim x(10) As IntegerDim x(10) As Integer

‘‘Now you can also declare it like thisNow you can also declare it like thisDim y(0 To 10) As IntegerDim y(0 To 10) As Integer

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Using StatementAcquire, Execute, ReleaseUsing StatementAcquire, Execute, Release

Fast way correctly release resources Easier to read than Try, Catch, Finally

Couple with Dispose Pattern stub gen

Fast way correctly release resources Easier to read than Try, Catch, Finally

Couple with Dispose Pattern stub gen

‘‘Using block disposes of resourceUsing block disposes of resourceUsing fStr As New FileStream(path, FileMode.Append)Using fStr As New FileStream(path, FileMode.Append) For i As Integer = 0 To fStr.LengthFor i As Integer = 0 To fStr.Length fStr.ReadByte()fStr.ReadByte() NextNext

‘ ‘End of block will close streamEnd of block will close streamEnd UsingEnd Using

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Continue StatementSkips to next iteration of loopContinue StatementSkips to next iteration of loop

Loop logic is concise, easier to read Loop logic is concise, easier to read

For j As Integer = 0 to 5000For j As Integer = 0 to 5000 While matrix(j) IsNot thisValueWhile matrix(j) IsNot thisValue If matrix(j) Is thatValueIf matrix(j) Is thatValue

‘ ‘ Continue to next jContinue to next j Continue ForContinue For

End IfEnd If

Graph(j)Graph(j) End WhileEnd WhileNext jNext j

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Global KeywordAccess to root (empty) namespaceGlobal KeywordAccess to root (empty) namespace

Complete name disambiguation Better choice for code generationComplete name disambiguation Better choice for code generation

Namespace HeadTraxNamespace HeadTrax Class Form1Class Form1

Inherits Windows.Forms.FormsInherits Windows.Forms.Forms

Sub LastName(nm As String)Sub LastName(nm As String) Global.Microsoft.VisualBasic.Left(nm)Global.Microsoft.VisualBasic.Left(nm) End SubEnd Sub End ClassEnd ClassEnd NamespaceEnd Namespace

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Accessor AccessibilityGranular accessibility on Get and Set

Accessor AccessibilityGranular accessibility on Get and Set

Forces calls to always use get, setEasy way to enforce validationForces calls to always use get, setEasy way to enforce validation

Property Salary() As IntegerProperty Salary() As Integer GetGet

Return mSalaryReturn mSalary End GetEnd Get

Private Set( value As Integer)Private Set( value As Integer)If value < 0 ThenIf value < 0 Then Throw New Exception(“Mistake”)Throw New Exception(“Mistake”)End IfEnd If

End SetEnd SetEnd PropertyEnd Property

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Partial TypesSingle Structure, Class in Multiple Files

Partial TypesSingle Structure, Class in Multiple Files

Used to separate designer gen into another fileFactor implementation

Used to separate designer gen into another fileFactor implementation

Public Class Form1Public Class Form1 Inherits Windows.Forms.FormInherits Windows.Forms.Form

‘ ‘ Your CodeYour CodeEnd ClassEnd Class

Partial Class Form1Partial Class Form1‘ ‘ Designer codeDesigner codeSub InitializeComponent()Sub InitializeComponent() ‘ ‘ Your controlsYour controlsEnd SubEnd Sub

End ClassEnd Class

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Unsigned TypesFull support in the languageUnsigned TypesFull support in the language

Full platform parityEasier Win32 Api calls and translationMemory and performance win

Full platform parityEasier Win32 Api calls and translationMemory and performance win

Dim sb As SByte = -4 ‘Error:negativeDim sb As SByte = -4 ‘Error:negativeDim us As UShortDim us As UShortDim ui As UIntegerDim ui As UIntegerDim ul As ULongDim ul As ULong

‘‘Full support in VisualBasic modulesFull support in VisualBasic modulesIf IsNumeric(uInt) ThenIf IsNumeric(uInt) Then

‘ ‘ Will now return true Will now return true End IfEnd If

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New Language Features

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Operator OverloadingCreate your own base typesOperator OverloadingCreate your own base typesClass AddrClass Addr Private mString As StringPrivate mString As String

Property Value() As StringProperty Value() As String GetGet Return mStringReturn mString End GetEnd Get Set (value As String)Set (value As String) If Valid(value) ThenIf Valid(value) Then mString = valuemString = value End IfEnd If End SetEnd Set

Shared Operator &(ad1 As Addr, ad2 As Addr) _Shared Operator &(ad1 As Addr, ad2 As Addr) _ As AddrAs Addr

Return New Addr(ad1.Value & ad2.Value)Return New Addr(ad1.Value & ad2.Value) End Operator End Operator

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Operator Overloading

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List intList = new List()List intList = new List()

intList.Add(1) intList.Add(1) ‘ Argument is boxed‘ Argument is boxedintList.Add(2) intList.Add(2) ‘ Argument is boxed‘ Argument is boxedintList.Add("Three") intList.Add("Three") ‘ Should be an error‘ Should be an error

int i = CInt(intList(0)) int i = CInt(intList(0)) ‘ Cast required‘ Cast required

GenericsGenericsPublic Class ListPublic Class List<ItemType><ItemType> Private elements() As Private elements() As ItemTypeItemType Private count As IntegerPrivate count As Integer

Public Sub Add(element As Public Sub Add(element As ItemTypeItemType) ) If (count = elements.Length) Then _If (count = elements.Length) Then _ Resize(count * 2)Resize(count * 2) count += 1count += 1 elements(count) = elementelements(count) = element End SubEnd Sub

Public Property default(index As Integer) As Public Property default(index As Integer) As ItemTypeItemType Get : Return elements(index) : End GetGet : Return elements(index) : End Get Set : elements(index) = value : End SetSet : elements(index) = value : End Set End PropertyEnd Property

Public Property Count As IntegerPublic Property Count As Integer Get : Return count : End GetGet : Return count : End Get End PropertyEnd PropertyEnd ClassEnd Class

Public Class ListPublic Class List Private elements() As ObjectPrivate elements() As Object Private mCount As IntegerPrivate mCount As Integer

Public Sub Add(element As Object) Public Sub Add(element As Object) If (mCount = elements.Length) Then _If (mCount = elements.Length) Then _ Resize(mCount * 2)Resize(mCount * 2) mCount += 1mCount += 1 elements(mCount) = elementelements(mCount) = element End SubEnd Sub

Default Public Property i(index As Integer) As ObjectDefault Public Property i(index As Integer) As Object Get Get Return elements(index) Return elements(index) End GetEnd Get Set Set elements(index) = value elements(index) = value End SetEnd Set End PropertyEnd Property

Public Property Count() As IntegerPublic Property Count() As Integer Get : Return mCount : End GetGet : Return mCount : End Get End PropertyEnd PropertyEnd ClassEnd Class

Dim intList As New ListDim intList As New List

intList.Add(1)intList.Add(1)intList.Add(2)intList.Add(2)intList.Add("Three")intList.Add("Three")

Dim i As Integer = intList(0)Dim i As Integer = intList(0)

Dim intList As New ListDim intList As New List(Of Integer)(Of Integer)

intList.Add(1) ‘ No boxingintList.Add(1) ‘ No boxingintList.Add(2) ‘ No boxingintList.Add(2) ‘ No boxingintList.Add("Three") ‘ Compile-time errorintList.Add("Three") ‘ Compile-time error

int i = intList(0) ‘ No cast requiredint i = intList(0) ‘ No cast required

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Generics (Specifics)Generics (Specifics)

Compile Time CheckingEliminates runtime errors

PerformanceNo casting or boxing overhead

Code reuseEasy to create strongly typed collections

Generic Collection classes in Framework

Dictionary, HashTable, List, Stack, etc.

Compile Time CheckingEliminates runtime errors

PerformanceNo casting or boxing overhead

Code reuseEasy to create strongly typed collections

Generic Collection classes in Framework

Dictionary, HashTable, List, Stack, etc.

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Generics

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Visual Basic WarningsEarly warning of bad runtime behavior

Visual Basic WarningsEarly warning of bad runtime behavior

Overlapping catch blocks or cases Recursive property accessUnused Imports statementUnused local variableFunction, operator without returnReference on possible null referenceOption Strict broken down

“Late binding”VB Style ConversionsEtc.

Overlapping catch blocks or cases Recursive property accessUnused Imports statementUnused local variableFunction, operator without returnReference on possible null referenceOption Strict broken down

“Late binding”VB Style ConversionsEtc.

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Warnings

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Additional ResourcesAdditional Resources

Related sessionsTLS343 – Visual Studio “Whidbey”: Advanced Debugging Techniques (Tuesday 5:15 Room 408 AB)TLS344 – Visual Studio “Whidbey”: Deploying Applications Using ClickOnce (Wednesday 10:00 Room 511 ABC)ARC413 – CLR Under the Covers: “Whidbey” CLR Internals (Wednesday 5:00 Room 152/153)

Related sessionsTLS343 – Visual Studio “Whidbey”: Advanced Debugging Techniques (Tuesday 5:15 Room 408 AB)TLS344 – Visual Studio “Whidbey”: Deploying Applications Using ClickOnce (Wednesday 10:00 Room 511 ABC)ARC413 – CLR Under the Covers: “Whidbey” CLR Internals (Wednesday 5:00 Room 152/153)

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Additional ResourcesAdditional Resources

PanelsAsk The Experts (Tonight)Languages Panel (Thursday)

Send us [email protected]: microsoft.public.dotnet.vbhttp://msdn.microsoft.com/vstudio/whidbeypdc

Other resourcesPaul Vick’s blog: www.panopticon.net

PanelsAsk The Experts (Tonight)Languages Panel (Thursday)

Send us [email protected]: microsoft.public.dotnet.vbhttp://msdn.microsoft.com/vstudio/whidbeypdc

Other resourcesPaul Vick’s blog: www.panopticon.net

http://msdn.microsoft.com/vstudio/whidbeypdc

http://msdn.microsoft.com/vstudio/whidbeypdc

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SummarySummary

Ease of use is built on solid infrastructureMany points of extensibilityVery powerful new language features

And some cool fit and finish ones too

Full access to the platform

Please fill out the eval!(Thank you!)

Ease of use is built on solid infrastructureMany points of extensibilityVery powerful new language features

And some cool fit and finish ones too

Full access to the platform

Please fill out the eval!(Thank you!)

1 Visual Basic “Whidbey”: Advanced Language and IDE Features Steven Lees, [email protected]...

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