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Lars Andreas
60
Programmatically expand group after programmatically grouping
posted

Hi.

We're using the XamDataGrid and are trying to programmatically group the grid by a column, directly followed by expanding/collapsing certain groups. We use the following code to perform the grouping:

dataGrid.FieldLayouts[0].SortedFields.Clear();
dataGrid.FieldLayouts[0].SortedFields.Add(new FieldSortDescription{
       FieldName = "Category",
       IsGroupBy = true
});

We then loop through the xamDataGrid.Records (which should all now be of type GroupByRecord), and mark them as either expanded or not. Both actions (the grouping and expansion/collapsing) work, but not both at the same time. The problem with the expansion/collapsing is that the records have not yet become GroupByRecords.

It seems like the sorting/grouping occurs asynchronously and we have not been able to find an event that fires when the sorting/grouping finishes. (There's a Grouped event and such, but that only fires when the grouping is triggered by the end user).

 Any help is appreciated!

Lars Andreas

 

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  • 69686
    posted

     Hello Lars,

    I have reproduced locally that situation and everything works fine with me or at least what I think you are asking.

    I have created a table and group records programatically like you have done. The loop through all of them and expand and collapse them. I am not sure what is the problem so I will paste you my source code. I am also using NetAdvantage for WPF 2008 Vol. 2.

    <igDP:XamDataGrid Name="xamDataGrid1">
               
            </igDP:XamDataGrid>
            <Button Height="30" Name="button1" Width="64" Click="button1_Click">Group</Button>
            <Button Height="30" Name="button2" Width="64" Click="button2_Click">Expand</Button>
            <Button Height="30" Name="button3" Width="64"Click="button3_Click">Collapse</Button>

    and the Code-Behind file:

    public class Numbers
            {
                public int A { get; set; }
                public int B { get; set; }
                public int C { get; set; }
                public Numbers(int a, int b, int c)
                {
                    A = a;
                    B = b;
                    C = c;
                }
            }
            ObservableCollection<Numbers> collection = new ObservableCollection<Numbers>();
            public Window1()
            {
                InitializeComponent();
                collection.Add(new Numbers(1, 2, 3));
                collection.Add(new Numbers(5, 6, 7));
                collection.Add(new Numbers(2, 3, 4));
                collection.Add(new Numbers(7, 8, 9));
                collection.Add(new Numbers(2, 2, 1));
                collection.Add(new Numbers(5, 5, 9));
                xamDataGrid1.DataSource = collection;
            }

            private void button1_Click(object sender, RoutedEventArgs e)
            {
                xamDataGrid1.FieldLayouts[0].SortedFields.Clear();
                xamDataGrid1.FieldLayouts[0].SortedFields.Add(new FieldSortDescription
                {
                    FieldName = "A",
                    IsGroupBy = true
                });
                xamDataGrid1.FieldLayouts[0].SortedFields.Add(new FieldSortDescription
                {
                    FieldName = "B",
                    IsGroupBy = true
                });
            }

            private void button2_Click(object sender, RoutedEventArgs e)
            {
                foreach (var r in xamDataGrid1.Records)
                {
                    r.IsExpanded = true;
                }
            }

            private void button3_Click(object sender, RoutedEventArgs e)
            {
                foreach (var r in xamDataGrid1.Records)
                {
                    r.IsExpanded = false;
                }
            }
        }

    I hope this helps. 

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