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POBinding ListView Throws Window must be the root of the tree. Cannot add Window as a child of Visual
 

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  1. POBinding ListView Throws Window must be the root of the tree. Cannot add Window as a child of Visual
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    <p>I am attempting to bind a ObservableCollection to a ListView but when I attempt to debug the program VS2010 is throwing the exception "Window must be the root of the tree. Cannot add Window as a child of Visual"</p> <p>If I was to remove the attempted ItemsSource binding the WPF window opens (obviously without any data in the listView). I have create a Sub in my codebehind that parses an XML file and adds values to the ObservableCollection, I then bind the ListView.</p> <p>I have stepped through the code, and the error appears to be in the XAML as the Sub completes without error, the program errors after the CodeBehind has completed, everytime.</p> <p>My XAML file is as follows:</p> <pre><code>&lt;Window x:Class="test_ListView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="test_ListView" Height="300" Width="300"&gt; &lt;Grid&gt; &lt;ListView Height="105" HorizontalAlignment="Left" Name="lst_EmergencyContacts" VerticalAlignment="Top" Width="478"&gt; &lt;ListView.View&gt; &lt;GridView&gt; &lt;GridViewColumn Header="Name" Width="160" /&gt; &lt;GridViewColumn DisplayMemberBinding="{Binding emContactsNumber}" Header="Number" Width="70" /&gt; &lt;GridViewColumn DisplayMemberBinding="{Binding emContactsPhoneCoverage}" Header="Phone Coverage" Width="95" /&gt; &lt;GridViewColumn DisplayMemberBinding="{Binding distListPhone}" Header="Distance" Width="60" /&gt; &lt;GridViewColumn Header="More" Width="60" /&gt; &lt;/GridView&gt; &lt;/ListView.View&gt; &lt;/ListView&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>While I believe the error is within the XAML, I will include the CodeBehind details, just in case (as the program will run without the error if the Sub isnt called that binds the ListView).</p> <pre><code> Public Property emContactsName() As String Get Return em_Name End Get Set(ByVal value As String) em_Name = value End Set End Property Private em_Name As String Public Property emContactsNumber() As String Get Return em_Number End Get Set(ByVal value As String) em_Number = value End Set End Property Private em_Number As String Public Property emContacts27Mhz() As String Get Return em_27Mhz End Get Set(ByVal value As String) em_27Mhz = value End Set End Property Private em_27Mhz As String Public Property emContactsUhf() As String Get Return em_Uhf End Get Set(ByVal value As String) em_Uhf = value End Set End Property Private em_Uhf As String Public Property emContactsVhf() As String Get Return em_Vhf End Get Set(ByVal value As String) em_Vhf = value End Set End Property Private em_Vhf As String Public Property IsSelected() As Boolean Get Return m_IsSelected End Get Set(ByVal value As Boolean) m_IsSelected = value End Set End Property Private m_IsSelected As Boolean Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded getEmergencyContactsData("\", "EmergencyContacts.xml") End Sub Private Sub getEmergencyContactsData(ByVal docPath As String, ByVal docName As String) Try Dim xDoc As XmlDocument = New XmlDocument Dim nList As XmlNodeList Dim node As XmlNode xDoc.Load(docPath + docName) nList = xDoc.SelectNodes("/items/item") Dim emergencyContactsCollection As New ObservableCollection(Of test_googleLookup)() For Each node In nList Dim eID = node.Attributes.GetNamedItem("id").Value Dim eName = node.ChildNodes.Item(0).InnerText Dim eNumber = node.ChildNodes.Item(1).InnerText Dim eRadio27Mhz = node.ChildNodes.Item(2).InnerText Dim eRadioUhf = node.ChildNodes.Item(3).InnerText Dim eRadioVhf = node.ChildNodes.Item(4).InnerText emergencyContactsCollection.Add(New test_googleLookup() With {.emContactsName = eName, .emContactsNumber = eNumber, .emContacts27Mhz = eRadio27Mhz, .emContactsUhf = eRadioUhf, .emContactsVhf = eRadioVhf, .IsSelected = 0}) Next ' Add to resources Resources("emergencyContactsCollection") = emergencyContactsCollection lst_EmergencyContacts.ItemsSource = emergencyContactsCollection Catch End Try End Sub </code></pre> <p>I can see when stepping through the debug that the XML file is being correctly parsed and the values being added to the ObservableCollection.</p> <p>If anyone can provide any assistance it would be greatly appreciated.</p> <p>Thanks.</p>
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