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POBinding 2 ComboBox to a Dictionary, then binding the ComboBoxes to each other
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  1. POBinding 2 ComboBox to a Dictionary, then binding the ComboBoxes to each other
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    copied!<p>I have a Dictionary of int to char (decimal &amp; ASCII character associated with that int). I want to have two editable combo boxes that are pre-populated with the initial values. If the user selected a value from ComboBox “A” (the dict key) I want the dict value to be populated in ComboBox “B” – and vice versa.</p> <p>It’s relatively easy to pre-populate the initial values into ComboBoxes “A” &amp; “B”. It’s the two-way binding that’s stumped me.</p> <p>Here is the VM where I populate the Dictionary:</p> <pre><code> private void InitializeSpearatorsDictionaries() { // comma, semicolon, vertical pipe, tilda int[] fields = { 44, 59, 124, 126 }; foreach (int f in fields) { FieldDict.Add(f, Convert.ToChar(f)); } } public IDictionary&lt;int, char&gt; FieldDict { get { if (_fieldDict == null) { _fieldDict = new Dictionary&lt;int, char&gt;(); } return _fieldDict; } } </code></pre> <p>Here is the initial XAML where I bind to the Dictionary (still, no problems)</p> <pre><code>&lt;StackPanel&gt; &lt;ComboBox x:Name="cbFieldChar" ItemsSource="{Binding Path=FieldDict}" SelectedIndex="0" DisplayMemberPath="Key" SelectedValuePath="Value" IsEditable="True" /&gt; &lt;ComboBox x:Name="cbFieldDecimal" ItemsSource="{Binding Path=FieldDict}" SelectedIndex="0" DisplayMemberPath="Value" SelectedValuePath="Key" IsEditable="True" /&gt; &lt;/StackPanel&gt; </code></pre> <p>Initially, i had the ItemsSource = {Binding Path=FIeldDict.Keys} and {Binding Path=FieldDict.Values}, in which case I didn't need the DisplayMemberPath and SelectedValuePath attributes, but with trying to get two-way working, I reworked it (both approaches work with the initial loading of the dictionary).</p> <p>Here's the latest attempt at getting two-way between the two ComboBoxes working</p> <pre><code>&lt;StackPanel&gt; &lt;ComboBox x:Name="cbFieldChar" ItemsSource="{Binding Path=FieldDict}" SelectedIndex="0" DisplayMemberPath="Key" SelectedValuePath="Value" IsEditable="True" /&gt; &lt;ComboBox x:Name="cbFieldDecimal" ItemsSource="{Binding Path=FieldDict}" SelectedIndex="0" DisplayMemberPath="Value" SelectedValuePath="Key" IsEditable="True" SelectedValue="{Binding ElementName=cbFieldChar, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Path=ItemsSource.Value}" /&gt; &lt;/StackPanel&gt; </code></pre> <p>Any ideas?<br> Thanks in advance,<br> --Ed</p>
 

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