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CommonDialog Control for Visual Basic 6.0 Users 

The Visual Basic 6.0 CommonDialog control is replaced by several specialized components in Visual Basic 2005.

Conceptual Differences

In Visual Basic 6.0, the CommonDialog ActiveX control is used to display various common dialogs (Open, Save, Color, Font, Print, and Help) to your application.

In Visual Basic 2005, the CommonDialog control is replaced by individual components for displaying dialogs — the OpenFileDialog, SaveFileDialog, ColorDialog, FontDialog, and PrintDialog components.

NoteNote

There is no direct equivalent for showing a Help dialog in Visual Basic 2005. The CommonDialog control only supported Windows Help; Visual Basic 2005 only supports HTML Help. Visual Basic 2005 uses the HelpProvider component to display help for your application. For more information, see Help Support for Visual Basic 6.0 Users.

Code Changes for the CommonDialog Control

The following examples illustrate the differences in coding techniques between Visual Basic 6.0 and Visual Basic 2005 for some common uses of the CommonDialog control.

Code Changes for Displaying a File Open Dialog Box

The following code demonstrates displaying a File Open dialog box, initialized to the Program Files directory.

' Visual Basic 6.0
' Uses a CommonDialog control.
CommonDialog1.InitDir = "C:\Program Files"
CommonDialog1.ShowOpen
' Visual Basic 2005
' Uses a OpenFileDialog component.
OpenFileDialog1.InitialDirectory = "C:\Program Files"
OpenFileDialog1.ShowDialog()

Code changes for Displaying a File Save Dialog Box

The following code demonstrates displaying a File Save dialog box, saving the file to the application's folder.

' Visual Basic 6.0
' Uses a CommonDialog control.
CommonDialog1.InitDir = App.Path
CommonDialog1.ShowSave
' Visual Basic 2005
' Uses a SaveFileDialog component.
SaveFileDialog1.InitialDirectory = My.Application.Info.DirectoryPath
SaveFileDialog1.ShowDialog()

Code changes for Displaying a Print Dialog Box

The following code demonstrates displaying a Print dialog box, printing a file located in the application's folder.

' Visual Basic 6.0
' Uses a CommonDialog control.
CommonDialog1.FileName = App.Path & "MyFile.txt"
CommonDialog1.ShowPrinter
' Visual Basic 2005
' Uses PrintDocument and PrintDialog components.
PrintDocument1.DocumentName = My.Application.Info.DirectoryPath _
& "MyFile.txt"
PrintDialog1.Document = PrintDocument1
PrintDialog1.ShowDialog()

Code changes for Displaying Help

The following code demonstrates displaying a Help file from your application, opening it to the table of contents.

' Visual Basic 6.0
' Uses a CommonDialog control.
CommonDialog1.HelpFile = "C:\Windows\Help\calc.hlp"
CommonDialog1.HelpCommand = cdlHelpContents
CommonDialog1.ShowHelp
' Visual Basic 2005
' Uses the Help.ShowHelp method.
Help.ShowHelp(Me, "file://C:\Windows\Help\calc.chm", _
HelpNavigator.TableOfContents)

CommonDialog Control Property and Method Equivalencies

The following tables list Visual Basic 6.0 properties and methods and their Visual Basic 2005 equivalents. Properties and methods with the same names and behaviors are not listed. Where applicable, constants are indented beneath the property or method. All Visual Basic 2005 enumerations map to the System.Windows.Forms namespace unless otherwise noted.

Links are provided as necessary to topics explaining differences in behavior. Where there is no direct equivalent in Visual Basic 2005, links are provided to topics that present alternatives.

Properties

Visual Basic 6.0 Visual Basic 2005 Equivalent

Action

New implementation. The Visual Basic 6.0 Action property determines which dialog to display; Visual Basic 2005 uses a separate component for each dialog.

CancelError

Cancel

Copies

Copies

DialogTitle

Title (OpenFileDialog and SaveFileDialog components only)

New implementation for the other components. Standard Windows titles (Color, Font, and Print) are displayed and cannot be overridden.

FileName

FileNames

FileTitle

New implementation. The Visual Basic 6.0 FileTitle property returns the FileName without the path; you can parse the FileNames property to get the name without the path.

Flags

The Visual Basic 6.0 Flags property provides constants for setting various attributes of the different common dialogs. Rather than using constants, the dialog components provide properties for setting the attributes.

Font

FontBold

FontItalic

FontName

FontSize

FontStrikethrough

FontUnderline

Font

NoteNote

Fonts are handled differently in Visual Basic 2005. For more information, see Font Handling for Visual Basic 6.0 Users.

FromPage

FromPage

hDC

New implementation. For more information see Graphics for Visual Basic 6.0 Users.

HelpCommand

HelpNavigator

HelpFile

HelpNamespace

HelpKey

The parameter parameter of the ShowHelp method.

Index

New implementation. For more information, see Control Arrays for Visual Basic 6.0 Users.

InitDir

InitialDirectory

Left

Left

NoteNote

Coordinates are handled differently in Visual Basic 2005. For more information, see Coordinate System for Visual Basic 6.0 Users.

Max

MaxSize (FontDialog component)

MaximumPage (PrintDialog component)

Min

MinSize (FontDialog component)

MinimumPage (PrintDialog component)

MaxFileSize

New implementation. This property Visual Basic 6.0 allocates memory for extremely long file names; it is no longer necessary in managed code.

Orientation

Landscape

Parent

FindForm method

PrinterDefault

New implementation. This Visual Basic 6.0 property is used in conjunction with the hDC property to print using graphic device interface methods; this is no longer supported.

Top

P:System.Windows.Forms.Control.Top

NoteNote

Coordinates are handled differently in Visual Basic 2005. For more information, see Coordinate System for Visual Basic 6.0 Users.

ToPage

ToPage

Methods

Visual Basic 6.0 Visual Basic 2005 Equivalent

AboutBox

New implementation. The AboutBox property displayed an About box for the CommonDialog control, which was created for Microsoft by a third party.

ShowColor

ShowDialog (ColorDialog component)

ShowFont

ShowDialog (FontDialog component)

ShowHelp

ShowHelp

ShowOpen

ShowDialog (OpenFileDialog component)

ShowPrinter

ShowDialog (PrintDialog component)

ShowSave

ShowDialog (SaveFileDialog component)

Upgrade Notes

When upgrading an application from Visual Basic 6.0 to Visual Basic 2005, any CommonDialog controls are upgraded to their equivalent dialog component (OpenFileDialog, SaveFileDialog, ColorDialog, FontDialog or PrintDialog).

There is no direct equivalent for showing a Help dialog in Visual Basic 2005. If a CommonDialog control is being used as a Help dialog, a warning will be issued and it will not be upgraded. For more information, see Help Support for Visual Basic 6.0 Users.

A single CommonDialog control could be used to display different types of dialogs. In this case it will be upgraded to a OpenFileDialog component; a warning will be issued and you will need to add the other dialog components manually.

In addition, where a CommonDialog control was used as a variable you may need to change it to refer to a specific dialog component after upgrade.

See Also

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