qr code library c# download Part 4: Advanced VBA in C#

Creator QR Code in C# Part 4: Advanced VBA

Part 4: Advanced VBA
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End Sub
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An object is added to the collection using the following code. The code assumes that the object being added has a Name property whose type is String. The routine begins by using the On Error Resume Next statement to disable error trapping. Any errors will simply force Visual Basic to execute the next statement. To detect that an error occurred, the Err object is used.
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Public Sub Add(Item As Plant) Dim i As Long
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Dim s As String
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On Error Resume Next
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i = 0
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s = Item.Name
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MyPlants.Add Item, s
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Do While Err.Number <> 0
i = i + 1 Item.Name = s & ( & FormatNumber(i, 0) & )" Err.Clear MyPlants.Add Item, Item.Name Loop End Sub
The counter i is initially set to zero, and the name of the new object is saved in the temporary variable s. Then the Collection object s Add method is used to try to add the new object to the Collection object. If an error occurs in the Add method, the counter i is incremented. A new Name for the object is constructed by using the original name followed by an open parenthesis, the num ber from the counter i, and a close parenthesis. Then the routine attempts to add the new object to the collection again. If the Add method fails again, the loop is repeated until the name of the object is unique.
Developing Class Modules An item is removed from the collection by calling the Remove method and specifying either the relative position of the object or the value of the Name property. In either case, the Remove method from the Collection object is used to remove the item from the underlying collection.
Public Sub Remove(key As Variant) MyPlants.Remove key End Sub
In the same fashion, the Count method returns the number of items in the collection by call ing the underlying Count method associated with the Collection object.
Public Function Count() As Long Count = MyPlants.Count End Function
The Clear method is useful if you want to delete all the objects in the collection. This routine just destroys the underlying Collection object and then creates a new instance of the Collection object.
Public Sub Clear() Set MyPlants = Nothing
Set MyPlants = New Collection
End Sub
The Item method returns a single item from the collection. Like the Remove and Count meth ods, this item simply calls the Collection object s Item method.
Public Function Item(key As Variant) As Plant Set Item = MyPlants.Item(key) End Function
The following routine is a macro that iterates through the collection class that was just cre ated. The macro begins by creating a new Plants object named MyPlants, which contains a collection of Plant objects. Then the code calls the SampleData method, which simply adds some sample objects to the collection.
Part 4: Advanced VBA
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Sub Test() Dim MyPlants As Plants Dim p As Plant Dim i As Long Set MyPlants = New Plants MyPlants.SampleData For i = 1 To MyPlants.Count Set p = MyPlants.Item(i) MsgBox p.Name Next i
Set p = Nothing
Set MyPlants = Nothing
End Sub
Part 4: Advanced VBA
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Next it uses a For Next loop to iterate through each item in the collection. The object variable p is set to the current item from the collection, and the Name property is displayed in a mes sage box. Notice that the first item in the collection begins with 1, and the number of items in the col lection is retrieved from the collection s Count property.
Where Do I Get My Data
Classes are an ideal way to hold data from an external source. By holding the data in a col lection class, you can allow your program to access the data independently of how the data is physically stored. This way if you change the way the data is stored, you don t have to change the way that the data is accessed. By providing a method named LoadData, anyone using the class can load the data from the data source. Then if you migrate the data from a worksheet to an Access database, only the load method will change. The code accessing the collection class won t change, unless you change the parameters to the LoadData method. Likewise, you could provide a standard method called SaveData, which would update the data wherever it s stored. With a little work, you could even make the method intelligent enough so that it updates only the objects that were updated, instead of having to update all the data whether it was updated by the user or not.
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