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POHow to make a ListBox.ItemTemplate reusable/generic
 

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  1. POHow to make a ListBox.ItemTemplate reusable/generic
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    <p>I'm fairly new to WPF and trying to understand how best to extend the <code>ListBox</code> control. As a learning experience, I wanted to build a <code>ListBox</code> whose <code>ListBoxItem</code>s display a <code>CheckBox</code> instead of just text. I got that working in a basic fashion using the <code>ListBox.ItemTemplate</code>, explicitly setting the names of the properties I wanted to databind to. An example is worth a thousand words, so...</p> <p>I've got a custom object for databinding:</p> <pre><code>public class MyDataItem { public bool Checked { get; set; } public string DisplayName { get; set; } public MyDataItem(bool isChecked, string displayName) { Checked = isChecked; DisplayName = displayName; } } </code></pre> <p>(I build a list of those and set <code>ListBox.ItemsSource</code> to that list.) And my XAML looks like this:</p> <pre><code> &lt;ListBox Name="listBox1"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;CheckBox IsChecked="{Binding Path=Checked}" Content="{Binding Path=DisplayName}" /&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; </code></pre> <p>This works. But I want to make this template reusable, i.e. I'll want to bind to other objects with properties other than "Checked" and "DisplayName". How can I modify my template such that I could make it a resource, reuse it on multiple <code>ListBox</code> instances, and for each instance, bind <code>IsChecked</code> and <code>Content</code> to arbitrary property names?</p>
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    1. USMatt Winckler
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      1. USAnthony Brien
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    1. COI don't think this is possible. To have the "Checked" bindinging be flexible you're going to have to subclass the ListBox and add a CheckedMemberPath like the DisplayMemberPath. Can't do this with just a template.
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      1. USCameron MacFarland
    2. COThat's what I was afraid of. I'd started looking into subclassing ListBox, but I kept reading things about how incredible templates are and how you should avoid subclasses if it's at all possible to accomplish what you want with a template. I guess this may be a good case for a subclass. Thanks!
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      1. USMatt Winckler
 

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