WPF Datagrid Binding

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Hello

I have following code in xaml:

XML

<DataGrid AutoGenerateColumns="False" HorizontalGridLinesBrush="Black" IsReadOnly="False"
          ItemsSource="{Binding AccessList, Mode=TwoWay}" Margin="5,8,5,0" Name="dgAccess">
    <DataGrid.Columns>
        <DataGridTemplateColumn Header="Group">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <ComboBox
                        SelectedItem="{Binding Path=UserGroup, Mode=TwoWay}"
                        ItemsSource="{Binding Path=DataContext.UserGroupList,
                        RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}"
                        IsReadOnly="False" Background="White" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns

The grid has a list of objects (List<doctypeaccess>).
The ComboBox in the datagrid has a list of objects (List<usergroup>).

When i select a group in a row, the binding sould set the property UserGroup in my object AccessList. But it not works. The AccessList.UserGroup is always null?

Class DocTypeAccess

SQL

public class DocTypeAccess
{
    public UserGroup UserGroup { get; set; }
}

Binding Property on ViewModel

C#

public List<DocTypeAccess> AccessList
{
    get { return m_listAccess; }
    set
    {
        m_listAccess = value;
        OnPropertyChanged("AccessList");
    }
}

What make i wrong?

Thanks for your help...

Posted 8-Nov-11 23:57pm

Member 7837957

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Wayne Gaylard 9-Nov-11 6:54am

Please see my comments below. I deleted your 'answer' and set it as a commetn to my answer.

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Wayne Gaylard · Accepted Answer · 2011-11-09T00:12:00

You don't give the properties for your UserGroup class, but if you want to bind the SelectedItem you need to identify a property in the UserGroup class that is unique to each UserGroup and then you need to bind the SelectedValue property and the SelectedValuePath to this property. So, just say your UserGroup class had a property called UserGroupID then you would set the SelectedValue property like this

XML

<DataTemplate>
                    <ComboBox
                        SelectedItem="{Binding Path=UserGroup, Mode=TwoWay}"
                        SelectedValue="{Binding SelectedDocTypeAcces.UserGroup.UserGroupID}"
                        SelectedValuePath="UserGroupID"
                        ItemsSource="{Binding Path=DataContext.UserGroupList,
                        RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}"
                        IsReadOnly="False" Background="White" />
                </DataTemplate>

I hope this makes sense. If not please post your UserGroup class code and We can work from there.

[Edit] By the way, this assumes you have a property in your ViewModel that returns an instance of a DocAccessType class called SelectedDocAccessType, which is bound to your DataGrid's SelectedItem property.[/Edit]