An indexed foreach for .aspx Web Forms
Nick blogged about why ASP.Net Repeaters Suck the other week and talked about using foreach loops in your .aspx. I love this and have been doing it for a while – the strong typing and consice syntax is great. However, sometimes I need format data based on odd and even rows…
<table>
<tr class='Row'><td></td></tr>
<tr class='AltRow'>...</tr>
</table>
To accomplish this I created a helper function in the page code behind:
protected void Foreach<T>(IEnumerable<T> enumerable, Proc<T, int> action){
int i = 0;
foreach(T t in enumerable){
action(t, i);
i++
}
}
Then in the .aspx
<%Foreach(People, (person, i) => { %>
<tr class='<%=i%2==0 ? "Row" : "AltRow"%>'><td><%=person.FullName%></td></tr>
<%});%>
Just what I needed!
June 25th, 2008 at 2:07 am
Hi there – stumbled across this while looking for something totally unrelated to the above post. however, it caught my interest as i too ‘loathe’ putting in repeaters (or any ‘logic’ for that matter) in the aspx page. however, i had an issue in being able to use the code as i’m not sure of the namespaces required to make all of this work. Here’s the code that i pasted into a default blank default.aspx.cs page:
protected void Foreach(IEnumerable enumerable, Proc action)
{
int i = 0;
foreach(T t in enumerable)
{
action(t, i);
i++;
}
}
(i had to add the colon after i++;). however, it still tells me that it ‘wants’ an assembly for this to work. please tell this idiot what he’s missing
thanks – btw, some great photos too!!!