Expand or Collapse the specific Group MVVM

[Salva]

I have a SfDataGrid with AutoExpandGroups="False"

<syncf:SfDataGrid Grid.Row="0" Grid.Column="0"  x:Name="DataGrid" MinHeight="500"
                              ItemsSource="{Binding Lista}"
                              SelectedItem="{Binding SelectedLista}"
                              AutoGenerateColumns="False"
                              ShowGroupDropArea="False"
                              AllowGrouping="True"
                              AutoExpandGroups="False"
                              AllowFiltering="True"
                              AlternatingRowStyle="{StaticResource AlternatingRowStyle}"
                              SelectionMode="Single"                             
                              SelectionUnit="Row"
                              NavigationMode="Row"
                          >

               <syncf:SfDataGrid.GroupColumnDescriptions>
                    <syncf:GroupColumnDescription ColumnName="nombre" />
                </syncf:SfDataGrid.GroupColumnDescriptions>

               <syncf:SfDataGrid.Columns>
                    <syncf:GridTextColumn MappingName="nombre"
                                      HeaderText="Nombre"
                                      AllowGrouping="True"
                                      GroupMode="Value"
                                      Padding="3,0,3,0"
                                      AllowFiltering="True"
                                      AllowBlankFilters="True" />
                    <syncf:GridTextColumn MappingName="identificador"
                                      HeaderText="Identificador"
                                      Padding="3,0,3,0" />
                    <syncf:GridTextColumn MappingName="nombre"
                                      HeaderText="Programa"
                                      Padding="3,0,3,0" />
     </syncf:SfDataGrid>

I'm using MVVM and I need to Expand a specifc group with MVVM.

Something like this but in MVVM.

var group = (dataGrid.View.Groups[0] as Group);
this.dataGrid.ExpandGroup(group);

this.dataGrid.CollapseGroup(group);

[Muthukumar Kalyanasundaram]

Hi Salva, 

 

Thank you for contacting Syncfusion support. 

 

We have analyzed your query. If you want to expand and collapse a specific group of record with MVVM pattern, you can achieve your requirement as shown like below code, 

 

Code Snippet: 

 

public static class Commands 

{ 

    static Commands() 

    { 

        CommandManager.RegisterClassCommandBinding(typeof(SfDataGrid), new CommandBinding(ExpandGroup, OnExpandGroup, OnCanExpandCollapse)); 

        CommandManager.RegisterClassCommandBinding(typeof(SfDataGrid), new CommandBinding(CollapseGroup, OnCollapseGroup, OnCanExpandCollapse)); 

    }            

 

    public static RoutedCommand ExpandGroup = new RoutedCommand("ExpandGroup", typeof(SfDataGrid)); 

    public static RoutedCommand CollapseGroup = new RoutedCommand("CollapseGroup", typeof(SfDataGrid)); 

 

    private static void OnExpandGroup(object sender, ExecutedRoutedEventArgs args) 

    { 

        var dataGrid = args.Source as SfDataGrid; 

        var group = (dataGrid.View.Groups[0] as Group); 

        dataGrid.ExpandGroup(group); 

    } 

 

    private static void OnCollapseGroup(object sender, ExecutedRoutedEventArgs args) 

    { 

        var dataGrid = args.Source as SfDataGrid; 

        var group = (dataGrid.View.Groups[0] as Group); 

        dataGrid.CollapseGroup(group); 

    } 

    private static void OnCanExpandCollapse(object sender, CanExecuteRoutedEventArgs e) 

    { 

        e.CanExecute = true; 

    } 

} 

 

Sample: https://www.syncfusion.com/downloads/support/forum/129870/ze/ExpandCollapse391239471 

 

Please let us know if you have any query. 

 

Regards, 

Muthukumar K 

[Salva]

Thanks, In my case, this not solve totally the problem but it have helped to solve it.

To solve it I have used

Command="{Binding ModifyCommand}"
CommandParameter="{Binding ., ElementName=DataGrid}"

And I have all the datagrid in my function.

[Muthukumar Kalyanasundaram]

Hi Salva,   

 

Thanks for the update. 

 

We are glad that you have fixed your issue. Please let us know if you need any other assistance.   

 

Regards,  

Muthukumar K