Getting at items in arraylist

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Mike P - 14 Oct 2007 21:13 GMT

I have an arraylist that is made up of Sandwich objects, which have
properties for each ingredient. What is the correct syntax to loop
through the arraylist and get at each of these properties for each item
in the array?

Reply to this Message

Mike P - 14 Oct 2007 22:34 GMT

I'm trying the following syntax, but getting errors. Can anybody help?

for (int i = 0; i <= orders.Count ; i++)
{
sb.Append("<br/><table>");
sb.Append("<tr><td>" + orders[i]["bacon"].ToString());
}

FULL CODE :

protected void Page_Load(object sender, EventArgs e)
{
ArrayList orders = new ArrayList();
StringBuilder sb = new StringBuilder();

orders = (ArrayList)Session["Order"];

sb.Append("<form id='form1' runat='server'>");
sb.Append("<div
style='text-align:center;page-break-after:always;'>");
sb.Append("<table style='width:6.5in;border:solid 1px
black;height:9.5in'>");
sb.Append("<tr>");
sb.Append("<td valign=top>");
sb.Append("<table width=90%>");
sb.Append("<tr>");
sb.Append("<td align=left valign=middle>ORDER</td>");

for (int i = 0; i <= orders.Count ; i++)
{
sb.Append("<br/><table>");
sb.Append("<tr><td>" + orders[i]["bacon"].ToString());
}

sb.Append("</td></tr></table></td></tr></table></div></form>");

DisplayOrder.InnerHtml += sb.ToString();
}

Reply to this Message

Arne Vajhøj - 14 Oct 2007 23:13 GMT

> I'm trying the following syntax, but getting errors. Can anybody help?
>
[quoted text clipped - 34 lines]
> DisplayOrder.InnerHtml += sb.ToString();
> }

1) It will be a bit easier for us if you tell us which errors you get.

2) I am not sure appending HTML is the best way to do this in ASP.NET.

Arne

Reply to this Message

Family Tree Mike - 15 Oct 2007 01:02 GMT

your order loops are going one step too far, and should go as follows:

for (int i = 0; i < orders.count; ++i)

However, I think that the following is more understandable, in my opinion:

foreach (Sandwitch s in orders)
{
}

> > I'm trying the following syntax, but getting errors. Can anybody help?
> >
[quoted text clipped - 40 lines]
>
> Arne

Reply to this Message

John B - 15 Oct 2007 07:24 GMT

> I'm trying the following syntax, but getting errors. Can anybody help?
>
> for (int i = 0; i <= orders.Count ; i++)
> {

You will need to cast the items as the ArrayList stores objects.
Sandwich item = (Sandwich)orders[i];
...item["bacon"].ToString();

<...>

HTH

JB

Reply to this Message

Mike P - 15 Oct 2007 09:14 GMT

John,

>>Sandwich item = (Sandwich)orders[i];
>>...item["bacon"].ToString();

So what is the correct full syntax to get at the item["bacon]?

Reply to this Message

Christof Nordiek - 15 Oct 2007 12:09 GMT

> John,
>
>>>Sandwich item = (Sandwich)orders[i];
>>>...item["bacon"].ToString();
>
> So what is the correct full syntax to get at the item["bacon]?

given that bacon is a property of the Sandwich-class:

item.bacon

the codeexample of JB presumes, that Sandwich has an indexer with parameter
of string and you want to return the item called bacon.
In that case item["bacon"] is allready the right syntax.

Christof

Reply to this Message

Christof Nordiek - 15 Oct 2007 12:12 GMT

>I have an arraylist that is made up of Sandwich objects, which have
> properties for each ingredient. What is the correct syntax to loop
> through the arraylist and get at each of these properties for each item
> in the array?

Unless you are bound to Framework 1.1 for some reason you should use
List<Sandwich> instead of ArrayList.

Christof

Reply to this Message

Getting at items in arraylist

Free Magazines