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Defining Results Datagrid In Code behind

PaulHuppé

Hi,

I need to be able to dynamically define datagrid columns in Code Behind. How would you convert the following XAML code in C# in code behind assuming the DataGrid name is MyGrid?

Thanks,
Paul

                            <slData:DataGrid.Columns>
                                <slData:DataGridTextColumn CanUserSort="True" SortMemberPath="NAME" Binding="{Binding Attributes[NAME]}" Header="Abrev."/>
                                <slData:DataGridTextColumn CanUserSort="True" SortMemberPath="MIN_NAME_E" Binding="{Binding Attributes[MIN_NAME_E]}" Header="Province Name"/>
                                <slData:DataGridTextColumn CanUserSort="True" SortMemberPath="MIN_STATUS" Binding="{Binding Attributes[MIN_STATUS]}" Header="Status"/>
                            </slData:DataGrid.Columns>

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Accepted answers

All comments

JenniferNery

If your ItemsSource is GraphicCollection, then each item is a Graphic. You need to update your Binding to "{Binding Attributes[FieldName]}".

EricPfirman

I used the examples in this thread to successfully bind a Silverlight DataGrid to a FeatureSet in code behind as follows:

MyDataGrid.ItemsSource = featureSet.Features;

Now I would like to do the same with a Silverlight Toolkit DataForm. If I use the following:

ToolkitDataForm.ItemsSource = featureSet.Features;

the DataForm gets bound to Geometry, Symbol, Addtributes, MapTip, etc. and not the attribute fields.

Any suggestions?

PaulHuppé

Silly me, it had to be something stupid! It works now.

thanks for spotting that!

Paul

DominiqueBroux

dgc.Binding = new System.Windows.Data.Binding("Attributes[NAME]");

's' missing.:)

PaulHuppé

Here is how I modified the Selection Sample from the Silverlight samples web site:

XAML code:
You can see the commented section which is being replace with the column definitions in the code behind in the next code block. If I remove the comment tags and comment out the code behind to define the columns, everything works. But of course, I want to be able to do this in code behind.

                        <slData:DataGrid x:Name="QueryDetailsDataGrid" Grid.Row="1"
                                        Width="Auto" Height="120"
                                        AutoGenerateColumns="False" HeadersVisibility="Column" Background="White" 
                                        IsReadOnly="True" HorizontalScrollBarVisibility="Hidden"
                                        RowStyle="{StaticResource MyCustomRow}" CanUserSortColumns="True"
                                        SelectionChanged="QueryDetailsDataGrid_SelectionChanged"
                                        LoadingRow="QueryDetailsDataGrid_LoadingRow">
                            <!--<slData:DataGrid.Columns>
                                <slData:DataGridTextColumn CanUserSort="True" SortMemberPath="NAME" Binding="{Binding Attributes[NAME]}" Header="Abrev."/>
                                <slData:DataGridTextColumn CanUserSort="True" SortMemberPath="MIN_NAME_E" Binding="{Binding Attributes[MIN_NAME_E]}" Header="Province Name"/>
                                <slData:DataGridTextColumn CanUserSort="True" SortMemberPath="MIN_STATUS" Binding="{Binding Attributes[MIN_STATUS]}" Header="Status"/>
                            </slData:DataGrid.Columns>-->
                        </slData:DataGrid>

Code behind:

            // Setup depending on selected layer
            switch (tbxLayerSelected.Text.ToString())
            {
                case "Provinces":
                    // Provinces is the 4th layer, index 3
                    queryTaskService = serverURL + "BaseMap/MapServer/3";
                    fieldsList = new string[] { "NAME", "MIN_NAME_E", "MIN_STATUS" };
                    QueryDetailsDataGrid.Columns.Clear();
                    DataGridTextColumn dgc = new DataGridTextColumn();
                    dgc.CanUserSort = true;
                    dgc.SortMemberPath = "NAME";
                    dgc.Binding = new System.Windows.Data.Binding("Attribute[NAME]");
                    dgc.Header = "Abrev.";
                    QueryDetailsDataGrid.Columns.Add(dgc);
                    dgc = new DataGridTextColumn();
                    dgc.CanUserSort = true;
                    dgc.SortMemberPath = "MIN_NAME_E";
                    dgc.Binding = new System.Windows.Data.Binding("Attribute[MIN_NAME_E]");
                    dgc.Header = "Province Name";
                    QueryDetailsDataGrid.Columns.Add(dgc);
                    dgc = new DataGridTextColumn();
                    dgc.CanUserSort = true;
                    dgc.SortMemberPath = "MIN_STATUS";
                    dgc.Binding = new System.Windows.Data.Binding("Attribute[MIN_STATUS]");
                    dgc.Header = "Status";
                    QueryDetailsDataGrid.Columns.Add(dgc);
                    
                    break;
                default:
                    break;
            }

            //QueryTask queryTask = new QueryTask("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/" +
            //    "Demographics/ESRI_Census_USA/MapServer/5");
            QueryTask queryTask = new QueryTask(queryTaskService);
            queryTask.ExecuteCompleted += QueryTask_ExecuteCompleted;
            queryTask.Failed += QueryTask_Failed;

            // Bind data grid to query results
            Binding resultFeaturesBinding = new Binding("LastResult.Features");
            resultFeaturesBinding.Source = queryTask;
            QueryDetailsDataGrid.SetBinding(DataGrid.ItemsSourceProperty, resultFeaturesBinding);
            Query query = new ESRI.ArcGIS.Client.Tasks.Query();
            
            // Specify fields to return from query
            //query.OutFields.AddRange(new string[] { "STATE_NAME", "SUB_REGION", "STATE_FIPS", "STATE_ABBR", "POP2000", "POP2007" });
            query.OutFields.AddRange(fieldsList);
            query.Geometry = args.Geometry;

            // Return geometry with result features
            query.ReturnGeometry = true;

            queryTask.ExecuteAsync(query);
        }

        private void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)
        {
            FeatureSet featureSet = args.FeatureSet;
            if (featureSet == null || featureSet.Features.Count < 1)
            {
                MessageBox.Show(msgNoFeatures);
                return;
            }

            GraphicsLayer graphicsLayer = Map.Layers["MySelectionGraphicsLayer"] as GraphicsLayer;

            if (featureSet != null && featureSet.Features.Count > 0)
            {
                QueryDetailsDataGrid.ItemsSource = args.FeatureSet.Features;
                foreach (Graphic feature in featureSet.Features)
                {
                    feature.Symbol = LayoutRoot.Resources["ResultsFillSymbol"] as FillSymbol;
                    graphicsLayer.Graphics.Insert(0, feature);
                }
                ResultsDisplay.Visibility = Visibility.Visible;
            }
            MyDrawSurface.IsEnabled = false;
        }

PaulHuppé

I added that line in the QueryTask_ExecuteCompleted method which executes after the query is executed and it has no effects.

DominiqueBroux

The ItemsSource property of your datagrid have to be initialized with a collection of graphics.

For example after a query returning a QueryEventArgs you should do:

 
myGrid.ItemsSource = args.FeatureSet.Features;

PaulHuppé

Hi Dominique,

That seems to work. that is, I am not getting any errors during compilation and running the applications. But, I do not get any data in the grid either, so there is still something wrong.

Here is the application flow so that you know what I am trying to do:

I select the layer I want to query from the legend using a radio button that sets a textbox with the layer name
When I select the tool desired to make a selection on the map, I check the textbox to determine which service to query and the list of fields to get back. At the same time, I add the required columns to the grid using the code you provided.
When I execute a query, the query seems to work, but I get an empty grid containing only the headers and no data rows.

I have attached a picture of the results grid.

Paul

Results.png

DominiqueBroux

Here is the code :

 
MyGrid.Columns.Add(new DataGridTextColumn() { 
  CanUserSort = true,
  SortMemberPath = "NAME",
  Binding = new System.Windows.Data.Binding("Attributes[NAME]"),
  Header = "Abrev."
});
 
MyGrid.Columns.Add(new DataGridTextColumn() { 
.....

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