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POWhy the databinding fails in ListView (WPF)?
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  1. POWhy the databinding fails in ListView (WPF)?
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    copied!<p>I have a ListView of which ItemSource is set to my Custom Collection.</p> <p>I have defined a GridView CellTemplate that contains a combo box as below :</p> <pre><code> &lt;ListView MaxWidth="850" Grid.Row="1" SelectedItem="{Binding Path = SelectedCondition}" ItemsSource="{Binding Path = Conditions}" FontWeight="Normal" FontSize="11" Name="listview"&gt; &lt;ListView.View&gt; &lt;GridView&gt; &lt;GridViewColumn Width="175" Header="Type"&gt; &lt;GridViewColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;ComboBox Style="{x:Null}" x:Name="TypeCmbox" Height="Auto" Width="150" SelectedValuePath="Key" DisplayMemberPath="Value" SelectedItem="{Binding Path = MyType}" ItemsSource="{Binding Path = MyTypes}" HorizontalAlignment="Center" /&gt; &lt;/DataTemplate&gt; &lt;/GridViewColumn.CellTemplate&gt; &lt;/GridViewColumn&gt; &lt;/ListView&gt; public MyType : INotifyPropertyChanged </code></pre> <p>{ string Key; string Value;</p> <pre><code>public string Key { get { return _key; } set { _key = value; this.OnPropertyChanged("Key"); } } public string Value { get { return _value; } set { _value = value; this.OnPropertyChanged("Value"); } } public MyType () { } public MyType (string key, string value) { _key = key; _value = value; } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = this.PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } #endregion </code></pre> <p>}</p> <pre><code> public void MoveUpExecuted() { int oldIndex = this.Conditions.IndexOf(_selectedCondition); //Check if the selected item is not the first item if (oldIndex != 0) { int newIndex = oldIndex - 1; this.Conditions.Move(oldIndex, newIndex); } } </code></pre> <p>My Custom collection is the ObservableCollection.</p> <p>I have a two buttons - Move Up and Move Down on top of the listview control . When user clicks on the Move Up or Move Down button I call Move method of Observable Collection.</p> <p>But when I Move Up and Move Down the rows then the Selected Index of a combo box is -1.</p> <p>I have ensured that selectedItem is not equal to null when performing Move Up and Move Down commands.</p> <p>Please Help!!</p>
 

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