Bob,
In addition Meelis' sample.
Consider using an ArrayList (.NET 1.x) or List(Of T) (.NET 2.0) instead.
Both are array like structures that dynamic grow "intelligently". They both
allocate a larger then needed buffer & only reallocate when the buffer in
full. Which is significantly more GC friendly then resizing the array on
each iteration of the loop.
' .NET 1.x
Dim t As ArrayList
| For i = 0 To 1000
| t(i) = i
| Next
' .NET 2.x
Dim t As List(Of Integer)
| For i = 0 To 1000
| t(i) = i
| Next
The ArrayList actually holds a list of Objects, so it is not very GC
friendly, nor type safe friendly, plus it has overridable methods which can
be a minor performance issue.
The List(Of Integer) holds a list of Integers, so it is very GC friendly,
fully type safe, plus avoids overriable methods eliminating that possible
performance issue...
FWIW: List(Of T) is a generic class, it is a strongly typed list of what
ever type you give for T. For example:
List(Of Integer) = a strongly typed list of integers
List(Of Double) = a strongly typed list of doubles
List(Of Customer) = a strongly typed list of Customer objects
--
Hope this helps
Jay B. Harlow [MVP - Outlook]
..NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley -
http://www.tsbradley.net
| Hello,
|
| I'm starting with vb.net and i get this error:
| Object reference not set to an instance of an object
|
| Dim t() As Integer
| For i = 0 To 1000
| t(i) = i
| Next
|
| Thanks
| Bob
|
|
