Passing Binding Data to a User Control in a DataGrid

Question

I've set up a datagrid that is bound to an ObservableCollection. One column in this grid is populated by a user control that needs to get data from the ObservableCollection that the parent datagrid is bound to. Is it possible to bind the child user control to use data from the ObervableCollection? The XAML I'm using is:

<Window x:Class="Hotspots_Control.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:Hotspots_Control"
    Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
    <local:viewModel/>
</Window.DataContext>
<DataGrid ItemsSource="{Binding areaList}" Name="hotspotsGrid" AutoGenerateColumns="False" CanUserAddRows="False">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Area" Binding="{Binding Path=area}" IsReadOnly="True"/>
        <DataGridTemplateColumn Header="Alarms">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <local:AlarmView/>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

The grid is bound to "areaList" inside the "viewModel" object. I need to get the AlarmView user control to have access to each object in the ObservableCollection. Is there a way to do this?

Metro Smurf Metro Smurf · Accepted Answer · 2012-06-05T15:40:32

Use the DataContext property to set the bound object(s):

<DataTemplate>
  <local:AlarmView DataContext="{Binding}"/>
</DataTemplate>

Since the DataTemplate is already bound to the areaList, you can set the DataContext with direct binding. From here, the child view will have access to the areaList objects.

Passing Binding Data to a User Control in a DataGrid

2 Answers