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Tip of the Day
Language: VB.NET
Expertise: Intermediate
Mar 30, 2002

Building arrays on the fly

VB.NET supports the creation of arrays on-the-fly, by using the New operator. For example, look at the following code, that uses GDI methods to display few connected lines

' Get the Graphics object from the form.
Dim gr As Graphics = Me.CreateGraphics
' Draw three straight lines.
Dim points() As Point = {New Point(10, 10), New Point(100, 80), New Point(200, _
    20), New Point(300, 100)}
gr.DrawLines(Pens.Black, points) 
' release the Graphics object
gr.Dispose
The points array is used only to pass an argument to the DrawLines method. Here's how you can get rid of its explicit declaration:

' Get the Graphics object from the form.
Dim gr As Graphics = Me.CreateGraphics
' Draw three straight lines (notice the array built on the fly)
gr.DrawLines(Pens.Black, New Point() {New Point(10, 10), New Point(100, 80), _
    New Point(200, 20), New Point(300, 100)}) 
' release the Graphics object
gr.Dispose
Francesco Balena
 
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