Is there a way to sort a hashtable?

[Arjen]

Hello,

Let's say that we have a hashtable with some person objects.
This persons have a name.

Now I want to sort the people objects inside the hashtable by name.
How can the hashtable do this for me?

Thanks!

[Jon Skeet [C# MVP]]

Arjen <bo*****@hotmail.com> wrote:

Let's say that we have a hashtable with some person objects.
This persons have a name.

Now I want to sort the people objects inside the hashtable by name.
How can the hashtable do this for me?

You can't - a hashtable is effectively a set, not a sequence: it
doesn't have an order.

What you *can* do is:

ArrayList al = new ArrayList (hashtable.Values);
al.Sort (myNameComparator);

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[omyek]

Alternatively, there is the SortedList class which is a hybrid between
the Hashtable and ArrayList. (it sorts based on the key)

Although, it sounds as if your Hashtable stores the Person objects as
the value in which case this wouldn't work.

Nonetheless, now you know there's a SortedList. :)

On Fri, 9 Jan 2004 22:33:31 -0000, Jon Skeet [C# MVP]
<sk***@pobox.com> wrote:

Arjen <bo*****@hotmail.com> wrote:

Let's say that we have a hashtable with some person objects.
This persons have a name.

Now I want to sort the people objects inside the hashtable by name.
How can the hashtable do this for me?

You can't - a hashtable is effectively a set, not a sequence: it
doesn't have an order.

What you *can* do is:

ArrayList al = new ArrayList (hashtable.Values);
al.Sort (myNameComparator);

[100]

Hi Arjen,
As long as hashtables are not ordered collections you cannot sort them.
However, you can maintain a separate list along with the hashtable which
will keep the order of the elements and you can sort this list and use it
latter to retreive the elements.
Take a look on System.Collections.SortedList as well. It might be exactly
what you are after.

HTH
B\rgds
100

"Arjen" <bo*****@hotmail.com> wrote in message
news:bt**********@news4.tilbu1.nb.home.nl...

Hello,

Let's say that we have a hashtable with some person objects.
This persons have a name.

Now I want to sort the people objects inside the hashtable by name.
How can the hashtable do this for me?

Thanks!

[Eric Gunnerson [MS]]

This might help:

http://msdn.microsoft.com/library/de...rp01212002.asp

--
Eric Gunnerson

Visit the C# product team at http://www.csharp.net
Eric's blog is at http://weblogs.asp.net/ericgu/

This posting is provided "AS IS" with no warranties, and confers no rights.
"100" <10*@100.com> wrote in message
news:OF**************@TK2MSFTNGP11.phx.gbl...

Hi Arjen,
As long as hashtables are not ordered collections you cannot sort them.
However, you can maintain a separate list along with the hashtable which
will keep the order of the elements and you can sort this list and use it
latter to retreive the elements.
Take a look on System.Collections.SortedList as well. It might be exactly
what you are after.

HTH
B\rgds
100

"Arjen" <bo*****@hotmail.com> wrote in message
news:bt**********@news4.tilbu1.nb.home.nl...

Hello,

Let's say that we have a hashtable with some person objects.
This persons have a name.

Now I want to sort the people objects inside the hashtable by name.
How can the hashtable do this for me?

Thanks!

[Arjen]

Thanks!
"Eric Gunnerson [MS]" <er****@online.microsoft.com> schreef in bericht
news:uX**************@tk2msftngp13.phx.gbl...

This might help:

http://msdn.microsoft.com/library/de...rp01212002.asp
--
Eric Gunnerson

Visit the C# product team at http://www.csharp.net
Eric's blog is at http://weblogs.asp.net/ericgu/

This posting is provided "AS IS" with no warranties, and confers no rights. "100" <10*@100.com> wrote in message
news:OF**************@TK2MSFTNGP11.phx.gbl...

Hi Arjen,
As long as hashtables are not ordered collections you cannot sort them.
However, you can maintain a separate list along with the hashtable which
will keep the order of the elements and you can sort this list and use it latter to retreive the elements.
Take a look on System.Collections.SortedList as well. It might be exactly what you are after.

HTH
B\rgds
100

"Arjen" <bo*****@hotmail.com> wrote in message
news:bt**********@news4.tilbu1.nb.home.nl...

Hello,

Let's say that we have a hashtable with some person objects.
This persons have a name.

Now I want to sort the people objects inside the hashtable by name.
How can the hashtable do this for me?

Thanks!