Question

I am trying to populate a datagrid with one column as a combobox but I need that when the collection binded to the combobox is empty the column becomes a textbox column. I have defined the columns as below:

Binding binding = new Binding(“DataContext.Prices”);
binding.RelativeSource = new RelativeSource(RelativeSurceMode.FindAncestor, typeof(UserControl),1);

DataGridComboBoxColumn productPrices = new DataGridComboBoxColumn()
{
   ElementSyle = new Style
   {
        TargetType = typeof(ComboBox),
        Setters =
        {
            new Setter
            {
                Property=ComboBox.ItemsSourceProperty,
                Value= binding
            }
        }
   },
   EditingElementSyle = new Style
   {
        TargetType = typeof(ComboBox),
        Setters =
        {
            new Setter
            {
                Property=ComboBox.ItemsSourceProperty,
                Value= binding
            }
        }
   },
   DisplayMemberPath = new Binding("Price");
   SelectedValuePath = new Bindnt("Price");
};

myDataGrid.Columns.Add(productPrices);
myDataGrid.Columns.Add(new DataGridTextColumn(){ Header="Name", Binding=new Binding("Name")});

And I defined myDataGrid:

<DataGrid Name="myDataGrid" ItemsSource="{Binding Products}" />

In my viewmodel I create a

var products = new List<Product>
{
    new Product 
    {
       Name="Prod 1",
       Price="12.5"
    }
}
var prices = new List<PriceL>
{
    new PriceL
    {
       Price="12.5"
    },
    new PriceL
    {
       Price="10"
    }

}

ICollectionView Products = CollectionViewSource.GetDefaultView(products);
ICollectionView Prices = CollectionViewSource.GetDefaultView(prices);

I need that when “Prices” is empty the column become in a textbox I am working with MVVM and I tried with elementStyle but I cannot see any event in Combobox that let me verify it’s data source. Could any body help me ??

Answer 1

I just found one way to do that

<UserControl.Resources>
    <DataGrid ItemsSource={binding} x:Key="DataGrid1">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{ID}"/>
            <DataGridTextColumn Binding="{Name}"/>
        </DataGrid.Columns>
    </DataGrid>
    <DataGrid ItemsSource={binding} x:Key="DataGrid2">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{ID}"/>
            <DataGridCheckBoxColumn Binding="{Accepted}"/>
        </DataGrid.Columns>
    </DataGrid>

</UserControl.Resources>
<Grid>
    <ContentControl Content="{StaticResource DataGrid1}" DataContext="{Binding MyTable}" Name="myContent"/}    
</Grid>

Y por codigo puede cambiarse el content

myContent.Content = this.FindResource(“DataGrid2”);