Microsoft KB Archive/161215

= XL97: How to Programmatically Create a Collection =

Article ID: 161215

Article Last Modified on 11/23/2006

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APPLIES TO


 * Microsoft Excel 97 Standard Edition

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This article was previously published under Q161215





SUMMARY
New programming functionality in Microsoft Excel 97 allows you to create a collection. A collection is a predefined object that stores groups of related objects. A collection makes it easier to work with the object group. For example, you can use a For Each looping structure to loop through the collection. Each time the macro executes the loop it references a different object in the collection until all objects in the collection are referenced once.

This article includes a sample Visual Basic for Applications macro that creates and references a collection.



MORE INFORMATION
Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact a Microsoft Certified Partner or the Microsoft fee-based consulting line at (800) 936-5200. For more information about Microsoft Certified Partners, please visit the following Microsoft Web site:

https://partner.microsoft.com/global/30000104

For more information about the support options that are available and about how to contact Microsoft, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

In general, declare an object as a new collection to create the collection. After you create the Collection object, add items to the collection using the Add method or remove items using the Remove method.

 Create a new workbook and start the Visual Basic Editor (press ALT+F11). On the Insert menu, click Class Module.  In the class module, type the following declaration: Public EmployeeName As String You typically use a public variable in a class modules to define properties for the class.  If the Properties window is not visible, click Properties on the View menu. If the Project Explorer window is not visible, click Project Explorer on the view menu. In the Project Explorer, click the class module you inserted in the project in step 2.</li> In the Properties window, change the (Name) property of the class module to EmpClass .</li> On the Insert menu, click Module.</li>  In this module, type the following code: Sub MyCollection

Dim employees As New Collection  'Create the collection object. Dim num As Integer

num = 0   'Counter for number of employees added to the 'collection.

Do              Dim employee As New EmpClass    'Create new instance of the 'EmpClass class. num = num + 1

newname = InputBox("Enter new employee name" & Chr(13) _                  & "or press Cancel to see list of employees.")

If newname <> "" Then  'You did not press Cancel.

employee.EmployeeName = newname employees.Add Item:=employee, key:=CStr(num)

Set employee = Nothing   'Clear the current reference 'in preparation for next one.

End If

Loop Until newname = "" 'You pressed Cancel.

For Each x In employees MsgBox x.EmployeeName 'Display the employee name. Next

MsgBox employees.Count 'Current number of employees in collection.

For Each x In employees employees.Remove 1  'Remove each employee from the collection. Next

MsgBox employees.Count 'Display a count of zero because 'all employees were removed from the 'collection.

End Sub </li> Run the MyCollection macro.</li> When you are prompted, type any names, and then click Cancel to stop typing names.</li></ol>

Message boxes that display each of the names you typed appear. Then, a message box that displays a count of the names you typed appears. Another message box with a count of zero appears because the last For Each loop removes each employee from the collection.

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