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PODo not add a event click
 

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    <p>When you add a Click event throws System.NullReferenceException.</p> <pre><code>&lt;ListBox DockPanel.Dock="Top" DataContext="{Binding idPerson, Converter={StaticResource ConvertTrainersFromClientsKey}}" ItemsSource="{Binding}" &gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;DockPanel&gt; &lt;Button Content="{Binding name_trainer}" Tag="{Binding idPersonTrainer}" DockPanel.Dock="Top" Click="Button_Click"/&gt;//this Button_Click &lt;DockPanel&gt; &lt;TextBlock Text="Окончание заявки: "/&gt; &lt;TextBox DockPanel.Dock="Top" Style="{StaticResource TextBoxIsReadOnly}" Text="{Binding date_payment}"/&gt; &lt;/DockPanel&gt; &lt;/DockPanel&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; </code></pre> <p>without the event everything works fine</p> <p>event code:</p> <pre><code>private void Button_Click(object sender, RoutedEventArgs e) { } </code></pre> <p>edit:</p> <p>complete code in which the event in another element works well in right there.</p> <pre><code>&lt;ListView DockPanel.Dock="Top" Grid.Row="0" x:Name="datagrid" Loaded="datagrid_Loaded" ItemsSource="{Binding Client}"&gt; &lt;ListView.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;DockPanel LastChildFill="False"&gt; &lt;Border Margin="10" Width="100" BorderThickness="3" BorderBrush="LightBlue" CornerRadius="2" &gt; &lt;DockPanel&gt; &lt;Image Source="{Binding photo, Converter={StaticResource ConvertNullImageKey}}"/&gt; &lt;/DockPanel&gt; &lt;/Border&gt; &lt;DockPanel Margin="10" Width="{Binding BindingGroupName=dockwidth}"&gt; &lt;TextBox DockPanel.Dock="Top" Style="{StaticResource TextBoxIsReadOnly}" Text="{Binding name_client}"/&gt; &lt;Label Content="Сопровождающий" DockPanel.Dock="Top"/&gt; &lt;ListBox DockPanel.Dock="Top" x:Name="listbox" DataContext="{Binding idPerson, Converter={StaticResource ConvertTrainersFromClientsKey}}" ItemsSource="{Binding}" &gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;DockPanel&gt; &lt;Button Content="{Binding name_trainer}" Tag="{Binding idPersonTrainer}" DockPanel.Dock="Top" /&gt; &lt;DockPanel&gt; &lt;TextBlock Text="Окончание заявки: "/&gt; &lt;TextBox DockPanel.Dock="Top" Style="{StaticResource TextBoxIsReadOnly}" Text="{Binding date_payment}"/&gt; &lt;/DockPanel&gt; &lt;/DockPanel&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;Label DockPanel.Dock="Top" Content="Нету" Visibility="{Binding ElementName=listbox, Converter={StaticResource ConvertTrainersFromClientsVisibilityKey}}"/&gt; &lt;/DockPanel&gt; &lt;Grid Margin="10"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition/&gt; &lt;RowDefinition/&gt; &lt;RowDefinition/&gt; &lt;RowDefinition/&gt; &lt;RowDefinition/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition/&gt; &lt;ColumnDefinition/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Text="Дата рождения" Grid.Column="0" Grid.Row="0" Margin="5"/&gt; &lt;TextBlock Text="Адрес" Grid.Column="0" Grid.Row="1" Margin="5"/&gt; &lt;TextBlock Text="Телефон" Grid.Column="0" Grid.Row="2" Margin="5"/&gt; &lt;TextBlock Text="Email" Grid.Column="0" Grid.Row="3" Margin="5"/&gt; &lt;TextBlock Text="Партнер" Grid.Column="0" Grid.Row="4" Margin="5"/&gt; &lt;TextBox Text="{Binding date_reg}" Grid.Column="1" Grid.Row="0" Margin="5"/&gt; &lt;TextBox Text="{Binding address}" Grid.Column="1" Grid.Row="1" Margin="5"/&gt; &lt;TextBox Text="{Binding phone}" Grid.Column="1" Grid.Row="2" Margin="5"/&gt; &lt;TextBox Text="{Binding mail}" Grid.Column="1" Grid.Row="3" Margin="5"/&gt; &lt;Button Content="{Binding namePartner}" Click="Button_Click_1" Grid.Column="1" Grid.Row="4" Margin="5"/&gt; &lt;/Grid&gt; &lt;DockPanel LastChildFill="False" Margin="10"&gt; &lt;Button Content="Редактировать" DockPanel.Dock="Top" Margin="10" x:Name="p_editStudent" Click="p_editStudent_Click" VerticalAlignment="Center" /&gt; &lt;Button Tag="{Binding idPerson}" Content="Переписка" Margin="10" x:Name="p_allMessages" Click="p_allMessages_Click" DockPanel.Dock="Top" VerticalAlignment="Center" /&gt; &lt;Button Content="Написать письмо" Margin="10" x:Name="p_sendMessageForStudent" Click="p_sendMessageForStudent_Click" DockPanel.Dock="Top" VerticalAlignment="Center" /&gt; &lt;/DockPanel&gt; &lt;/DockPanel&gt; &lt;/DataTemplate&gt; &lt;/ListView.ItemTemplate&gt; &lt;/ListView&gt; </code></pre> <p>is work</p> <pre><code>&lt;Button Content="{Binding namePartner}" Click="Button_Click_1" Grid.Column="1" Grid.Row="4" Margin="5"/&gt; </code></pre> <p>click not work</p> <pre><code>&lt;Button Content="{Binding name_trainer}" Tag="{Binding idPersonTrainer}" Click="Button_Click" DockPanel.Dock="Top" /&gt; </code></pre>
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    1. USMediator
    1. USMediator
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    1. COCould you post the stack trace for the NullReferenceException?
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      1. USmcm69
    2. CO"Object reference not set to an instance of the object." - this is my translate from russian to english.
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      1. USMediator
 

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