print barcode labels in c# Part 3: The Excel Object Model in C#.NET

Drawer QR in C#.NET Part 3: The Excel Object Model

Part 3: The Excel Object Model
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Ranges and Cells The Print_Area range lets you set the range of cells using your choice of A1 notation, R1C1 notation, or range names. Examination of the Print_Area range properties will show you the range in the style that was used to set it.
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The following SelectPrint routine allows the user to choose between printing the entire sheet or just the evening values from the Y2001ByMonth workbook. The Print_Area range is used to inform Excel what values to print.
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Sub SelectPrint()
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Dim intReturn As Integer, strPrompt As String, strTitle As String
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Dim strRange As String, objName As Name, intCounter As Integer
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'Call CreateNames subroutine to ensure properly named ranges
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'are available
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CreateNames
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'Prompt for values to print out
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strPrompt = "Click Yes to print only the evenint values " _
& "and click No to print all values."
strTitle = "Microsoft Office Excel 2003 Programming Inside Out"
intReturn = MsgBox(strPrompt, vbYesNoCancel, strTitle)
'Check response from user Select Case intReturn Case vbNo 'Print full chart strRange = "=" & ActiveSheet.Name & "!" & _ ActiveSheet.Name & "AllValues" Case vbYes 'Print evening times only strRange = "=" & ActiveSheet.Name & "!" & _ ActiveSheet.Name & "1PM:" & _ ActiveSheet.Name & "8PM" Case vbCancel 'Cancel completely Exit Sub End Select 'Loop through Names collection. Delete Print_Area or
'Print_Titles if found.
intCounter = ActiveSheet.Names.count
While (intCounter > 0)
If ActiveSheet.Names(intCounter).Name = ActiveSheet.Name _
8
Part 3: The Excel Object Model
Microsoft Office Excel 2003 Programming Inside Out
& "!Print_Area" Then ActiveSheet.Names(intCounter).Delete intCounter = ActiveSheet.Names.count ElseIf ActiveSheet.Names(intCounter).Name = ActiveSheet.Name _ & "!Print_Titles" Then ActiveSheet.Names(intCounter).Delete intCounter = ActiveSheet.Names.count End If intCounter = intCounter - 1 Wend 'Set print area
ActiveWorkbook.Names.Add Name:=ActiveSheet.Name & _
"!Print_Area", RefersTo:=strRange 'Set titles if needed If vbYes Then ActiveSheet.PageSetup.PrintTitleColumns = _ ActiveSheet.Columns("B:C").Address ActiveSheet.PageSetup.PrintTitleRows = _ ActiveSheet.Rows("5:5").Address End If 'Print worksheet ActiveWorkbook.PrintPreview End Sub
8
Part 3: The Excel Object Model
Ranges and Cells
Copying Data Between Ranges and Arrays
All of the information within a workbook is easily available for manipulation through a VBA macro. W would you want to c py that infor ation to someplac else before w hy o m e orking with it Speed. It s a v ry time-c nsuming process for VBA to ead or write information to a w e o r orksheet. By minimizing the number of times that VBA needs to read or write to the worksheet, you can greatly reduce the amount of time needed for your procedure to operate. How can you reduce the number of read and writes to the worksheet By reading or writing a range of cells at a time. It s the setup time that VBA needs to access a worksheet that takes time. Unfortunately, VBA goes through the same setup process every time it needs to read or write another range, whether the range consists of only one cell or several hundred cells. Warning
As with most things, there is a point of diminishing returns or outright failure. VBA cannot transfer more than about 3000 cells at one time. As long as you stay well below that number, you should have no problems.
So the question now becomes how can you read or write to multiple cells at one time Transferring multiple cells between a workbook and VBA is done through the use of variant arrays. A variant data type can hold any other data type, including arrays. More importantly, the variant variable does not have to be declared as an array to hold an array. In fact, for the purposes of copying data to and from a worksheet, the variant variable cannot be declared as an array. The variable needs to be declared as a simple variant type, as in the following statement.
Dim varA As Variant
Reading the cells into a variant variable is done through an assignment statement, that is, varA = Range("January1PM") or varA = Range("H6:H36"). These two examples would read the same range into the variable varA, with the individual cells accessed the same as a single element of an array. Onc y u have assi e o gned values to the varant, you can use the varii able as a eference o the r nge. For example, you could use this c de to disp a message box r t a o lay containing just the sum of the values in cells E12:E15.
Sub VariantSum()
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