Question

I have a collection of object (Entity) which contains a sub-collection (Result is Double[]).

I want to display my collection of Entities (Entity) in a DataGrid (or others control) and I want to show my sub-collection in the same line (each value in my sub collection corresponding to a column)

Ex [EDIT] :

Entity name | Entity Value | Result1 | Result2 | ... | Result n
_______________________________________________________________
My Name     | MyValue      | 1       | 2       | ... | 3
My Name II  | other Value  | 10%     | 20%     | ... | 30%

I am using actually a solution based on ICustomTypeDescriptor and PropertyDescriptor described in this thread but it’s not appropriate because we want to edit the values in DataGrid, and it’s very complicated to maintain and to make evolve too.

Answer 1

If you have a static number of Result items, then you can turn off AutoGenerateColumns and define your own columns that bind to those values

<DataGrid AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding Name}" />
        <DataGridTextColumn Binding="{Binding Value}" />
        <DataGridTextColumn Binding="{Binding Results[1]}" />
        <DataGridTextColumn Binding="{Binding Results[2]}" />
        ....
    </DataGrid.Columns>
</DataGrid>

If you have a dynamic amount, you can use a DataGridTemplateColumn and display your sub-collection in something like an ItemsControl

<DataGrid AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding Name}" />
        <DataGridTextColumn Binding="{Binding Value}" />
        <DataGridTemplateColumn>
            <DataGridTemplateColumn.ItemTemplate>
                <DataTemplate>
                    <ItemsControl ItemsSource="{Binding Results}">
                        <ItemsControl.ItemsPanel>
                            <ItemsPanelTemplate>
                                <StackPanel Orientation="Horizontal" />
                            </ItemsPanelTemplate>
                        </ItemsControl.ItemsPanel>
                        <ItemsControl.ItemTemplate>
                            <DataTemplate>
                                <TextBox Width="50" Value="{Binding }" />
                            </DataTemplate>
                        </ItemsControl.ItemTemplate>
                    </ItemsControl>
                </DataTemplate>
            </DataGridTemplateColumn.ItemTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>