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POHow can I resolve this casting error?
 

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  1. POHow can I resolve this casting error?
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    <p>With the help of @competent_tech I have been able to get my comboboxitems to be selected via a button click and parsed through some VB code to get a document displayed. </p> <p>Everything seemed to be working fine, until I decided to bind the combobox to an XML file using the following code:</p> <pre><code>&lt;ComboBox Name="ComboBox1" ItemsSource="{Binding Source={StaticResource vehicleID}, XPath=//manualtype/ipck/vin}" IsReadOnly="True"&gt;&lt;/ComboBox&gt; </code></pre> <p>This is the code I'm using on the button.click event:</p> <pre><code>Try Dim sFileName As String If ComboBox1.SelectedValue IsNot Nothing Then sFileName = DirectCast(ComboBox1.SelectedValue, ComboBoxItem).Content.ToString() Dim theDocument As New System.Windows.Xps.Packaging.XpsDocument(System.IO.Path.Combine("C:\EMR", sFileName &amp; "ipck.xps"), System.IO.FileAccess.Read) DocumentViewer1.Document = theDocument.GetFixedDocumentSequence() End If Catch ex As Exception MessageBox.Show("ERROR: " &amp; ex.Message) End Try </code></pre> <p>The combobox is working fine - displaying the values from the XML file, however, I am now getting an error message whenever I select an item and click the button. The error message states: "UNABLE TO CAST OBJECT OF TYPE 'SYSTEM.STRING' TO TYPE 'SYSTEM.WINDOWS.CONTROLS.COMBOBOXITEM'.</p> <p>Please help me resolve this problem, as I'd like to be able to update the comboboxitem list via the XML file rather than having to recode the software each time I want to update the list. Thanks.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USKismet Agbasi
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COIs it not true that the SelectedValue is a string already? And that the SelectedItem is a ComboBoxItem?
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      1. POHow can I resolve this casting error?
      1. USAdriaan Stander
    2. CONot to try and sound condescending, but taking some time to learn how to use a debugger will really pay off in the long run. Simply setting breakpoints and using the watch window will help you immensely. So many programmers I run into are abysmal at debugging and it's one of most important skills you can develop.
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      1. POHow can I resolve this casting error?
      1. UScodeConcussion
 

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