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POWPF Error 40 BindingExpression path error: property not found on 'object'
 

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  1. POWPF Error 40 BindingExpression path error: property not found on 'object'
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    <p>I'm banging my head on my desk with this binding error.. I have checked several of the postings for the <code>BindingExpression</code> path error and cannot see anything that works with my situation.</p> <p>Anyway, I have a custom control called <code>IncrementingTextBox</code>. I am trying to disable it whenever the user 'checks' the <code>CheckBox</code> above it.</p> <p>I have a binding on the <code>CheckBox</code> <code>IsChecked</code> property that is working fine and is firing when it is supposed to. It is correctly setting the <code>UseSensorLength</code> property on the ConfigurationModel.</p> <p>However, the binding on the <code>IncrementingTextBox</code> <code>IsEnabled</code> property is causing a <code>BindingExpression</code> path error and so doesn't update at all.</p> <p>As a test, I tried in the code behind to enable and disable the control and it works just fine, but I can't seem to get the Binding to work on it.</p> <p>Here is a snippet from my xaml:</p> <pre><code>... DataContext="{Binding RelativeSource={RelativeSource Self}}" ... ... &lt;CheckBox Content="Use Sensor Length" Margin="30,6,0,0" IsChecked="{Binding ConfigurationModel.UseSensorLength, Mode=TwoWay}"/&gt; &lt;local:IncrementingTextBox x:Name="video_length_textbox" Margin="0,0,0,5" IsTextEnabled="False" IsEnabled="{Binding ConfigurationModel.DontUseSensorLength}" ValueChanged="VideoEventValueChanged"/&gt; </code></pre> <p>And Here is a snippet from my ConfigurationModel:</p> <pre><code>public bool DontUseSensorLength { get { return !UseSensorLength; } } public bool UseSensorLength { get { return _useSensorLength; } set { _useSensorLength = value; OnPropertyChanged("UseSensorLength"); OnPropertyChanged("DontUseSensorLength"); } } </code></pre> <p>Here is the error message I am getting in my output window when running the app:</p> <blockquote> <p>System.Windows.Data Error: 40 : BindingExpression path error: 'ConfigurationModel' property not found on 'object' ''IncrementingTextBox' (Name='video_length_textbox')'. BindingExpression:Path=ConfigurationModel.DontUseSensorLength; DataItem='IncrementingTextBox' (Name='video_length_textbox'); target element is 'IncrementingTextBox' (Name='video_length_textbox'); target property is 'IsEnabled' (type 'Boolean')</p> </blockquote> <p>Remember, the 'UseSensorLength' property binding is working fine, but the 'DontUseSensorLength' binding is causing the above 'BindingExpression path error'.</p>
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    1. USAndreas Niedermair
    1. USCurtis
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    1. COCan you post the error as well that you get from the Output Window?
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    2. COI have added the error message text to the above posting.
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      1. USCurtis
    3. COYou have to set the DataContext to reflect your current User Control. When you create the binding, it is looking inside `IncrementingTextBox`'s DataContext for the `ConfigurationModel.DontUseSensorLength` value. You have to use a `RelativeSource` similar to [this](http://stackoverflow.com/a/11550721/1466627).
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