Datagrid and combobox - MVVM and C#

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Hello, i'm studying the mvvm pattern with c#. I've a problem!
I have a datagrid with an ItemSource (class "Order") and a SelectedItem ("SelectedOrder").
With a select i fill a form with the information conteined in the datagrid, but for some values i need to proposing some choice with combobox.
The choices of the combobox are not in the selecteditem.
How can I display the detail of my selected article of data and give the possibility to the user to choice from a list of value (OPEN, CLOSE, ...).
Thanks in advance

What I have tried:

This is the view
<pre>
<Grid DataContext="{Binding SelectedOrder}">
...
<Label Content="Customer:" FontSize="12" x:Name="lblState" VerticalAlignment="Top" Grid.Row="2" Grid.Column="2"/>
<ComboBox x:Name="cmbState" FontSize="12" FontWeight="Normal" IsEditable="True"  Grid.Row="2" Grid.Column="3" Text="{Binding state,Mode=TwoWay}">
...
</Grid>

<DataGrid ItemsSource="{Binding Order, IsAsync=True}" SelectedItem="{Binding SelectedOrder, Mode=TwoWay}" Grid.Row="3" AutoGenerateColumns="false" CanUserAddRows="False" CanUserSortColumns="True" CanUserResizeRows="False" IsReadOnly="True" SelectionMode="Single" SelectionUnit="FullRow">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Number" Binding="{Binding numOrder}" Width="1*" />

This is the class Order

public class Order
    {
        public int id { get; set; }
        public string numOrder { get; set; }
        public string title { get; set; }
        public string state { get; set; }
        public string dateCreation { get; set; }
        public string note { get; set; }
    }

Posted 21-Oct-18 5:49am

Member 11091382

Updated 21-Oct-18 13:38pm

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Graeme_Grant · Accepted Answer · 2018-10-21T13:38:00

Solution 1

iI did a quick Google Search: wpf datagrid combobox column binding mvvm - Google Search[^]

The first result is a working answer for you: Binding a WPF DataGridComboBoxColumn with MVVM - Stack Overflow[^]

Posted 21-Oct-18 13:38pm

Graeme_Grant

Comments

Member 11091382 22-Oct-18 7:46am

Thanks for the reply, but actually is not the right answer for mine problem.
I'll try to better explain it:
I have a DataGrid with a main DataContext:

<Grid DataContext="{Binding CommessaDataContext}">
    ...
    <DataGrid ItemsSource="{Binding Orders, IsAsync=True}" SelectedItem="{Binding SelectedOrder, Mode=TwoWay}">
    ...
    </DataGrid>
</Grid>

When I select one order from datagrid i would to show up a detail of it in a nested grid with some TextBox and some ComboBox:

<Grid DataContext="{Binding SelectedCommessa}">
    ...
    <TextBox x:Name="selectedOrderNum" Grid.Row="1" Grid.Column="1" FontSize="14" Text="{Binding numOrder,Mode=TwoWay}" />
    ...
    <ComboBox x:Name="SelectedOrderState" Grid.Row="2"  Grid.Column="1" FontSize="12" IsEditable="True" Text="{Binding state,Mode=TwoWay}"  ItemsSource="{Binding orderStatus}"/>
</Grid>

The data-link from the selection and the filling of textboxes works fine, but i can't to preventively fill the ComboBox with other values, and show only object's value.

It's possible to nest a DataContext or ItemsSource inside a other DataContext?

Graeme_Grant 22-Oct-18 11:37am

The answer given still applies.

The ComboBox.ItemsSource uses OrderStatus which should be a collection of valid States. The binding needs to be a relative reference to a DataContext where the collection can be found.