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POWpf Time Traveling in a ComboBox
 

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  1. POWpf Time Traveling in a ComboBox
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    <p>I have a combobox inside my Window.xaml which I initialize with it's property SelectedIndex having the value 0 and with it's property SelectedItem having a Binding to a viewmodel's property.</p> <p>Sounds pretty easy and basically like this:</p> <pre><code>&lt;ComboBox SelectedItem = "{Binding MyChosenItem}" SelectedIndex="0" ItemsSource={Binding MyList} /&gt; </code></pre> <p>Now inside my MyList which is a simple list of string, the first entry is looking like this: "---NULL--". Its just a static entry indicating that user havent selected anything yet.</p> <p>Once I start my application the combobox sets its SelectedItem to "---NULL---" because of SelectedIndex = 0 and futhermore MyChosenItem gets also set to "---NULL---" since that is the combobox's SelectedItem.</p> <p>So far so good but now I would like to tearch the combobox to knows that once I have a value in MyChosenItem the combox may not set the selection to "---NULL---".</p> <p>Here is an example:</p> <p>If MyChosenItem = null then Combobox shall pick "---NULL---" as standard value though when MyChosenItem = "BMW" the combobox shall pick BMW as selected item which is the 4th item inside the MyList.</p> <p>How do I do this in WPF? The problem is SelectedIndex which always tries to set the first item as selected item but I need the 4th one. Do I need to time travel to the point after the first item is set and then I set combobox's SelectedItem to 4th one?</p> <p>Any ideas? Did somebody stumble upon this already in past?</p> <p><strong>Edit: I forgot to mention the combobox is a third party control and they somehow set manually SelectedIndex = 0 so I have no chance to change that. Therefore I beg you guys to stick to the requirements give in this question and I hope somebody figures some way to solve this or at least a nice workaround.</strong></p>
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    1. COI'm sorry but this is difficult to answer. You want us to fix a problem caused by a broken third party combobox where we don't have the source? Well lets try: Bind SelectedIndex to a property in your viewmodel, make your checks in the setter, and if the SelectedIndex is wrong, Dispatch a new Raise of get SelectedIndex with the correct value.
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