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Transcript of Ws vbnet slides
![Page 1: Ws vbnet slides](https://reader030.fdocuments.us/reader030/viewer/2022011722/58e977061a28abd2148b61ed/html5/thumbnails/1.jpg)
The presentation will begin at 9AM Pacific Time
Presenter: Sally Swenson ESRI Redlands, California
Migrating to VB .NET
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Seminar overviewTopics include
Moving from VB6 to VB .NETResolving tricky VB .NET issuesDistributing a VB .NET application
FormatEach topic followed by review and question and answer periodPresentation includes software demonstrations
Copyright © 2003 ESRI. All rights reserved.
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Moving from VB6 to VB .NET
Copyright © 2003 ESRI. All rights reserved.
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Reasons for migratingApplication requirements
Language options (VB and C#)Development environment
Built-in APIIntegrated HelpFully object oriented
Can't buy VB6 off the shelfVB6 is still available.ESRI Technical Article 24963 (http://support.esri.com)
ESRI requires migration to VB .NET?
Copyright © 2003 ESRI. All rights reserved.
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Reasons for migratingApplication requirements
Language options (VB and C#)Development environment
Built-in APIIntegrated HelpFully object oriented
Can't buy VB6 off the shelfVB6 is still available.ESRI Technical Article 24963 (http://support.esri.com)
ESRI requires migration to VB .NET? No, ESRI does NOT require VB .NETSupports VB6, or any language that supports COM
Copyright © 2003 ESRI. All rights reserved.
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More reasons for migrating Advanced features
ArcWeb ServicesDebugging
Beyond ICommand and IToolNew controls
DockingAnchoring
Copyright © 2003 ESRI. All rights reserved.
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Installing ArcGIS and VB .NETVisual Studio .NET 2002 or 2003
VB .NET onlyC++ and C#, if needed
ESRI ArcObjects .NET Developer KitContains API for ArcObjects development
Copyright © 2003 ESRI. All rights reserved.
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Adding assemblies...\ArcObjects Developer Kit\Dotnet\AssembliesESRI.ArcObjects.Core
DirectivesImports ESRI.ArcObjectsesriCore.IFeatureLayer > Core.IFeatureLayer
Getting started
Object Libraries (VB6) Assemblies (VB .NET)esriCore.olb Core
esriMx.olb Mx
esriSpatialExt.olb SpatialExt
esriStreetMap.olb StreetMapExt
esriSurveyCoreExt.olb SurveyCoreExt
Copyright © 2003 ESRI. All rights reserved.
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Using the ESRI Add-InsESRI Interface Implementer
Stubs out the implementation code wrapper linesNot needed for Visual Studio .NET 2003
ESRI Component Category RegistrarWorks with ESRI.ArcObjects.Samples.CatIDS assemblyAutomates component category registration
Copyright © 2003 ESRI. All rights reserved.
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Software demonstration
Copyright © 2003 ESRI. All rights reserved.
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Topic review and Q & AWhy migrate to VB .NET?InstallationAssemblies and DirectivesESRI Add-InsCreating projects in VB .NET
Copyright © 2003 ESRI. All rights reserved.
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Resolving tricky.NET issues
Copyright © 2003 ESRI. All rights reserved.
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Option statementsOption Explicit
On, by default Option Strict
Off, by defaultAllows narrowing conversion
On, recommendedPrevents narrowing conversionType safety
Copyright © 2003 ESRI. All rights reserved.
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Option Strict: query interface
Option Strict On Query Interface for ILayer
Option Strict Off Query Interface for ILayer
! Option Strict On disallows implicit conversions from 'ILayer' to 'IFeatureLayer'
featlayer = _CType(doc.focusmap.layer(0), IFeatureLayer)
Solution: Type cast
featlayer = doc.focusmap.layer(0)
Copyright © 2003 ESRI. All rights reserved.
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Exception handlingReplaces VB6 error handlingIf omit, beware!
Embedded resource is case sensitiveIf error, no warning plus no icon on interface
AssemblySystem.Runtime.InteropServices
TryGetManifestResourceStream("prj.zoomin.bmp")
Catch ex As ExceptionMsgBox _(ex.Message & "Error: " & [GetType]().Name)
Finally' Code you put in Finally will always execute
End Try
Copyright © 2003 ESRI. All rights reserved.
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Object by defaultIn VB6: multiple one-line declarations of same data type
In VB .NET, multiple one-line declarations of same data type
No more Variant
Dim i, j, k As Integer
Dim i, j, k As Integer
i = 11 ' Integerj = 12 ' Variantk = 13 ' Variant
i = 11 ' Integerj = 12 ' Integerk = 13 ' Integer
Copyright © 2003 ESRI. All rights reserved.
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Garbage collectionIn COM, need to free memory
In VB .NET, garbage collection is indeterminateobj = Nothing
Add the namespace
Release memory in the method that uses obj
Always release in a loop until ival = 0Dim ival As IntegerDo Until ival = 0ival = Marshal.ReleaseComObject(obj)
Loop
Imports System.Runtime.InteropServices
Marshal.ReleaseComObject(obj)
Copyright © 2003 ESRI. All rights reserved.
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Summary of changes with VB .NET
Visual Basic 6 Visual Basic .NETSet pAMap = pMxDoc.FocusMap AMap = MxDoc.FocusMap
Option Explicit Option Strict
DLL Assembly
Class module COM class
GUID created at compile GUID created in code
Error handling Exception handling
Debug.Print Debug.WriteLine
Class_Initialize / Terminate Class Constructor / Destructor
Copyright © 2003 ESRI. All rights reserved.
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Software demonstration
Copyright © 2003 ESRI. All rights reserved.
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Topic review and Q & AOption StrictException handlingGarbage collectionChanges with VB .NET
Copyright © 2003 ESRI. All rights reserved.
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Distributing an application
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Client requirements Full installation of ArcGIS
Including licenseArcObjects .NET Developer Kit
Assemblies
Copyright © 2003 ESRI. All rights reserved.
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Client requirements Full installation of ArcGIS
Including licenseArcObjects .NET Developer Kit
AssembliesVB .NET Framework (~500MB)
Already installed on newer machines
Copyright © 2003 ESRI. All rights reserved.
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COM component requirementsWindows registration
VB .NET Setup and Deployment wizard handles registrationAlternative: regasm.exe
Copyright © 2003 ESRI. All rights reserved.
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Topic review and Q & AClient requirementsCOM component requirements
Copyright © 2003 ESRI. All rights reserved.
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For more information
ArcObjects Onlinehttp://arcobjectsonline.esri.com
Getting Started >The .NET Framework
ESRI Instructor TrainingAdvanced ArcObjects Component Development I (VB)
Advanced ArcObjects Comp Dev II (.NET)
ESRI PressGetting to Know ArcObjects: Programming ArcGIS with VBA
Microsoftmsdn.microsoft.com/vbasic
Copyright © 2003 ESRI. All rights reserved.