Linq - Set a limit to a group while doing a request - linq

Question

I'm trying to find an efficient way to set a limit to each of my group in a linq request in C# (7 items by group for example). I don't want to create another group with the extra of one group I just want to pass to another category.
For the moment I'm doing this to fill my groupedList :
public IEnumerable<object> ListByCategory
{
get
{
var query = from item in listArticles.listArticles
orderby item.categorie
group item by item.categorie into g
select g;
return query;
}
}
I tried to go through this groupedList afterward and remove all the extra element in each category but it is not elegant at all.
Thank you in advance
Here is the Xaml part :
<local:MyGridView x:Name="PicturesGridView" SelectionMode="None"
ItemsSource="{Binding Source={StaticResource cvs1}}" IsItemClickEnabled="True" ItemTemplate="{StaticResource CustomTileItem}" ItemClick="ItemView_ItemClick" >
<local:MyGridView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</local:MyGridView.ItemsPanel>
<local:MyGridView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<Button Click="Button_Click_1" Content="{Binding Key}" Foreground="Black" Background="White" FontSize="30" Margin="0,0,0,-10" ></Button>
</DataTemplate>
</GroupStyle.HeaderTemplate>
<GroupStyle.Panel>
<ItemsPanelTemplate>
<VariableSizedWrapGrid ItemWidth="75" ItemHeight="150" Orientation="Vertical" Margin="0,0,80,0" MaximumRowsOrColumns="3"/>
</ItemsPanelTemplate>
</GroupStyle.Panel>
</GroupStyle>
</local:MyGridView.GroupStyle>
</local:MyGridView>
Here are the ressources :
<DataTemplate x:Key="CustomTileItem">
<Grid >
<Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}">
<Image Source="{Binding imageUrl}" Stretch="UniformToFill"/>
</Border>
<StackPanel VerticalAlignment="Bottom" >
<TextBlock Text="{Binding title}" Foreground="{StaticResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextStyle}" Height="30" Margin="15,0,15,0"/>
<TextBlock Text="{Binding chapo}" Foreground="{StaticResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextStyle}" TextWrapping="NoWrap" Margin="15,0,15,10"/>
</StackPanel>
</Grid>
</DataTemplate>
<CollectionViewSource x:Name="cvs1"
IsSourceGrouped="True" />
and I'm doing the binding like this :
IEnumerable<object> myObject = App.api.ListByCategory;
this.cvs1.Source = App.api.ListByCategory;

Answer 1

If I understand your request correctly, you can just use Take:
return from item in listArticles.listArticles
orderby item.categorie
group item by item.categorie into g
select g.Take(7);
(Obviously that can be a variable...)
Note that this will lose the fact that it's a grouping, so you'll no longer be able to take the key from each group. If that's a problem, you can select to a new data structure easily enough. For example:
return from item in listArticles.listArticles
orderby item.categorie
group item by item.categorie into g
select new { g.Key, Values = g.Take(7) };