Simplifying ASP.NET ListView Control Templates by Dan Wahlin

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Simplifying ASP.NET ListView Control Templates by Dan Wahlin

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Added by February 15, 2008

I've been working with the new ListView control in ASP.NET 3.5 combining it with LINQ and Lambda expressions and was finding myself duplicating a lot of code between ItemTemplate and AlternatingItemTemplate templates (I'll be posting the sample application that demonstrates using LINQ, Lambdas and Stored Procedures soon).  The AlternatingItemTemplate contained the same code as the ItemTemplate except for a CSS class added to the first <tr> element to change the background color.  Here's an example of both templates that were used initially:

It seemed like a waste (and a maintenance headache) to have both templates duplicating the same code while only needing background color changes so I decided to adjust it by adding a little code into the first <tr> tag to dynamically assign the CSS class based upon odd or even rows. It calls the ListViewDataItem class's DataItemIndex property and applies a modulus operation to it.  This isn't anything new of course (I've done the same type of thing for years with GridView and DataGrid controls), but it's a nice trick that can save a lot of duplicated code if you haven't seen it.

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