Windows Vista Forums
Vista Forums Home Join Vista Forums Windows 7 Forum Vista Tutorials Tags
Welcome to Windows Vista Forums. Our forum is dedicated to helping you find solutions with any problems, errors or issues you are experiencing with Windows Vista. The Vista forum also covers news and updates and has an extensive Windows Vista tutorial section that covers a wide range of tips and tricks.

Go Back   Vista Forums > Misc Newsgroups > .NET General

Vista - System.Collections.Generic.List<int> myList = new System.Collections.Generic.List<int>(100);

Reply
 
Old 04-09-2008   #1 (permalink)
DR


 
 

System.Collections.Generic.List<int> myList = new System.Collections.Generic.List<int>(100);

System.Collections.Generic.List<int> myList = new
System.Collections.Generic.List<int>(100);

Does this preallocate 100 integers?

Also, is there any way to preallocate an array of objects all at once?

MyOb[] al= new MyOb[100];

for (int z = 0; z < nCount; z++)

{

al[z] = new MyOb();

}



Can i avoid all these new and just allocate an array of MyOb all at once?



My System SpecsSystem Spec
Old 04-09-2008   #2 (permalink)
Peter Ritchie [C# MVP]


 
 

RE: System.Collections.Generic.List<int> myList = new System.Collectio

It creates a list with a capacity of 100. This, in reality, creates an array
with 100 elements in it. Because the type is int (a value type) it does
pre-allocate 100 ints.

I you already have an array of values you can pass it into the List<T>
constructor; but it will copy the values.

--
Browse http://connect.microsoft.com/VisualStudio/feedback/ and vote.
http://www.peterRitchie.com/blog/
Microsoft MVP, Visual Developer - Visual C#


"DR" wrote:
Quote:

> System.Collections.Generic.List<int> myList = new
> System.Collections.Generic.List<int>(100);
>
> Does this preallocate 100 integers?
>
> Also, is there any way to preallocate an array of objects all at once?
>
> MyOb[] al= new MyOb[100];
>
> for (int z = 0; z < nCount; z++)
>
> {
>
> al[z] = new MyOb();
>
> }
>
>
>
> Can i avoid all these new and just allocate an array of MyOb all at once?
>
>
>
My System SpecsSystem Spec
Reply

Thread Tools


Similar Threads
Thread Forum
V2 CTP3: How to use a generic List constructor PowerShell
why doesn't System.Collections.SortedList work in PowerShell PowerShell
how to do Generic.List.BinarySearch on byRef data? .NET General
How to put PSObject into System.Collections.ObjectModel.Collection PowerShell


Vista Forums is an independent web site and has not been authorized,
sponsored, or otherwise approved by Microsoft Corporation.
"Windows Vista", the Start Orb, and related materials are trademarks of Microsoft Corp.
© Designer Media Ltd

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46