I have two List<Order> and List<OrderDetails>

Order looks like this:
{
int orderID
List<OrderDetails> details
orderTotal
orderDate
...
}

I have a List that contains ALL OrderDetails and looks like this:
{
int orderID
Details details
...
}

What I'm looking to do process the second list so that i copy each
corresponding OrderDetail into the parent Order details.

What would be the best way to go about this?

Thanks

Sam

On Oct 12, 4:22 pm, Sam Shrefler <sshref...@gmail.com> wrote:
> I have two List<Order> and List<OrderDetails>
>
> Order looks like this:
> {
> int orderID
> List<OrderDetails> details
> orderTotal
> orderDate
> ...
>
> }
>
> I have a List that contains ALL OrderDetails and looks like this:
> {
> int orderID
> Details details
> ...
>
> }
>
> What I'm looking to do process the second list so that i copy each
> corresponding OrderDetail into the parent Order details.
>
> What would be the best way to go about this?

I'd create a Dictionary<int,Order> so that you can get from the order
ID to the order quickly. Then just do something like:

foreach (OrderDetails details in listOfOrderDetails)
{
Order order = orders[details.orderID];
order.details.Add(details);
}

Jon

Jon:

Thanks.

Is there an easy way to convert between a List and a Dictionary?

My List is already populated through an automatic DataReader->List
generator and given to me as a List...

Thanks

Sam


On Oct 12, 11:24 am, "Jon Skeet [C# MVP]" <sk...@pobox.com> wrote:
> On Oct 12, 4:22 pm, Sam Shrefler <sshref...@gmail.com> wrote:
>
>
>
>
>
> > I have two List<Order> and List<OrderDetails>
>
> > Order looks like this:
> > {
> > int orderID
> > List<OrderDetails> details
> > orderTotal
> > orderDate
> > ...
>
> > }
>
> > I have a List that contains ALL OrderDetails and looks like this:
> > {
> > int orderID
> > Details details
> > ...
>
> > }
>
> > What I'm looking to do process the second list so that i copy each
> > corresponding OrderDetail into the parent Order details.
>
> > What would be the best way to go about this?
>
> I'd create a Dictionary<int,Order> so that you can get from the order
> ID to the order quickly. Then just do something like:
>
> foreach (OrderDetails details in listOfOrderDetails)
> {
> Order order = orders[details.orderID];
> order.details.Add(details);
>
> }
>
> Jon- Hide quoted text -
>
> - Show quoted text -

On Oct 12, 4:41 pm, Sam Shrefler <sshref...@gmail.com> wrote:
> Is there an easy way to convert between a List and a Dictionary?

foreach (Order order in orders)
{
orderDictionary[order.orderID] = order;
}

is probably about as easy as you can get. (It's slightly easier with
LINQ in C# 3, admittedly...)

Jon

> Is there an easy way to convert between a List and a Dictionary?
>
> My List is already populated through an automatic DataReader->List
> generator and given to me as a List...


This should work pretty well:

Dictionary<int, Order> orders = new Dictionary<int, Order>();
list.ForEach(delegate(Order o)
{
orders.Add(o.orderID, o);
});


Cheers,
Adam
___________________
ab
http://godevelop.blogspot.com

<(E-Mail Removed)> wrote:
> > Is there an easy way to convert between a List and a Dictionary?
> >
> > My List is already populated through an automatic DataReader->List
> > generator and given to me as a List...
>
>
> This should work pretty well:
>
> Dictionary<int, Order> orders = new Dictionary<int, Order>();
> list.ForEach(delegate(Order o)
> {
> orders.Add(o.orderID, o);
> });

That will certainly work - but I think for situations as simple as
that, I'd usually use the normal foreach loop instead of the ForEach
method taking a delegate. Aside from anything else, introducing
captured variables can make life complicated in a hurry, and the
debugging is more "interesting" with the delegate version.

(In other cases where it brings a benefit, of course, it's a different
matter.)

--
Jon Skeet - <(E-Mail Removed)>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too