If you are talking about simply dumping values, I think the DataBinder.Eval
is the best approach (although whoever claims to be a performance champion
using DataBinder.Eval needs to get his or her head checked -
((CustomClass)Container.DataItem).Property is the way to go). However, if
you are doing any processing, applying any presentation logic (or worse
business logic) this definitely belongs in OnItemDataBind.
For example, if you are simply doing a dump:
<itemTemplate>
<%# DataBinder.Eval(Container.DataItem, "MyValue") %>
</itemTemplate>
is the way to go, but if you need to hide/show that value, don't do:
<itemTemplate>
<asp:literal id="lit" runat="Server" visible='<%#
DataBinder.Eval(Container.DataItem, "blah") = 1%>'><%#
DataBinder.Eval(Container.DataItem, "MyValue") %></asp:literal>
</itemTemplate>
either do:
<itemTemplate>
<asp:literal id="lit" runat="Server"
visible='<%#GetVisibility(Container)%>'><%#
DataBinder.Eval(Container.DataItem, "MyValue") %></asp:literal>
</itemTemplate>
or better, use the ItemDataBound and FindControl("lit")
Karl
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"Weston Weems" <wweems@nospamdamnit_gmail.com> wrote in message
news:10*************@corp.supernews.com...
Ok, I first of all dont know if thats the proper verbage.. lemme
explain...
Originally I was taught to handle databinding in a datagrid and such with
Databinder.Eval from the template.
Since then I've heard arguments for that and against.
What I've grown accustomed to is to just throw a generically named lable
in the template, then in onItemDataBound, do a e.Cells.FindControl("label")
and change properties appropriately (some times you have to do it this way)
I've heard the arguemnt against my methods, saying that asp.net allocates
memory etc for potentially hundreds of controls (on pages spitting out
tons of data).
Has anyone seen any speed/scalability benchmarks one way or another? I'd
prefer the findcontrol method and using e.Item.DataItem, to bind... as it
gives me a lot more power.
Thanks for the feedback (/me nudges asp.net team)
Weston Weems
