topic Re: Binding search result from FindTask to ListBox using DataTemplate SL4 in ArcGIS API for Silverlight Questions

Binding search result from FindTask to ListBox using DataTemplate SL4

MariaFernandez — Mon, 07 Mar 2011 18:06:31 GMT

Hi, I am trying to bind the FindTask result to a listbox with ItemTemplate defined as a StaticResource (DataTemplate).
I got error:
Unable to cast object of type 'System.Windows.Data.Binding' to type 'System.Collections.IEnumerable'

Thanks!!

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

DominiqueBroux — Tue, 08 Mar 2011 08:11:29 GMT

How looks your binding?

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

MariaFernandez — Tue, 08 Mar 2011 11:58:36 GMT

I have this control in the mainpage.xaml
<ListBox x:Name="SearchListBox" Background="White"
                                         ItemsSource="{Binding}"
                                         ItemTemplate="{StaticResource FeatureDataTemplate}"
                                         VerticalAlignment="Top">
                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate>
                        <StackPanel Orientation="Horizontal" />
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
            </ListBox>

The resource defined in the same page is
<ItemsPanelTemplate x:Key="ItemsPanelTemplate1">
            <StackPanel Orientation="Horizontal"/>
        </ItemsPanelTemplate>

I have a class Feature.vb
and a DataTemplate

<DataTemplate x:Key="FeatureDataTemplate">
        <Grid Width="auto">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="85"/>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>

            </Grid.ColumnDefinitions>
           <Border BorderThickness="3" BorderBrush="Green" Grid.RowSpan="2" Grid.Column="0" >
                <Image Source="{Binding PhotoUri}" Stretch="Fill"   />
            </Border>

            <dataInput:Label Content="{Binding FeatureLayerName}" Grid.Row="0" Grid.Column="1"/>
            <dataInput:Label Content="{Binding FeatureLayerItemCount}" Grid.Row="1" Grid.Column="1"/>


            <ListBox Padding="2" Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2"
                     ItemsSource ="{Binding Path=FeatureItems}"
                     ItemTemplate="{StaticResource FeatureItemDataTemplate}"

                      />


        </Grid>
    </DataTemplate>


    <DataTemplate x:Key="FeatureItemDataTemplate">
        <Grid >
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="50"/>
                <ColumnDefinition Width="100"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions >
                <RowDefinition ></RowDefinition>
                <RowDefinition ></RowDefinition>
            </Grid.RowDefinitions>
            <sdk:Label x:Name="labelName" Content="Name:" Grid.Column="0" Grid.Row="0"/>
            <dataInput:Label Content="{Binding Path=Name}" Grid.Row="0" Grid.Column="1"/>

            <sdk:Label x:Name="labelOwner" Content="Owner:" Grid.Column="0" Grid.Row="1"/>
            <dataInput:Label Content="{Binding Path=Owner}" Grid.Row="1" Grid.Column="1"/>

        </Grid>
    </DataTemplate>

In the executebutton click handling the FindTask I have:
SearchListBox.SetBinding(ListBox.ItemsSourceProperty, resultFeaturesBinding)
I am missing a way to assign the resultFeaturesBindeing to the getData in the Feature class (I don't know how to doit.)
Something like:
Dim features = Feature.GetData(resultFeaturesBinding)
   Me.DataContext = features

Thanks for your help!!

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

DominiqueBroux — Sat, 11 Dec 2021 15:44:44 GMT

At this time, I don't understand why you have 2 levels of listbox : one in your SearchListBox and one in your FeatureDataTemplate.

Let's focus on the first level. The goal is to initialize the 'ItemsSource' of your SearchListBox with an Enumeration of something.
It turns out out that the 'FindResults' returned by the 'FindTask' is a List of 'FindResult', so it's a good candidate as an ItemsSource.

To use it, there are 2 ways:
- Hook up an handler to the ExecuteCompleted event and, in the handler, initialize the DataContext of your control with e.FindResults (that's probably the easier way).

or - Set a binding by code to the LastResult property of the FindTask. The sample is working this way by this code:

           Binding resultFeaturesBinding = new Binding("LastResult");
            resultFeaturesBinding.Source = findTask;
            FindDetailsDataGrid.SetBinding(DataGrid.ItemsSourceProperty, resultFeaturesBinding);

.Then in your FeatureDataTemplate you can use properties of a 'FindResult' (i.e. LayerName, LayerId, Feature, Value, ...)

So your XAML code

<Border BorderThickness="3" BorderBrush="Green" Grid.RowSpan="2" Grid.Column="0" >
<Image Source="{Binding PhotoUri}" Stretch="Fill" />
</Border>
 
<dataInput:Label Content="{Binding FeatureLayerName}" Grid.Row="0" Grid.Column="1"/>
<dataInput:Label Content="{Binding FeatureLayerItemCount}" Grid.Row="1" Grid.Column="1"/>
 
 
<ListBox Padding="2" Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2"
ItemsSource ="{Binding Path=FeatureItems}"
ItemTemplate="{StaticResource FeatureItemDataTemplate}" 
 
/>

should rather be (since I don't see where FeatureLayerName, FeatreLayerItemCount and PhotoUri are coming from) :

<Border BorderThickness="3" BorderBrush="Green" Grid.RowSpan="2" Grid.Column="0" >
<Image Source="{Binding Feature.Attributes[PhotoUri]}" Stretch="Fill" />
</Border>
 
<dataInput:Label Content="{Binding LayerName}" Grid.Row="0" Grid.Column="1"/>
<dataInput:Label Content="{Binding LayerId}" Grid.Row="1" Grid.Column="1"/>
<dataInput:Label Content="{Binding Value}" Grid.Row="1" Grid.Column="1"/>

Hope this help.

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

MariaFernandez — Wed, 09 Mar 2011 13:31:51 GMT

Thanks for your help!!!
I used your first suggestion and is working!!!!:
- Hook up an handler to the ExecuteCompleted event and, in the handler, initialize the DataContext of your control with e.FindResults (that's probably the easier way).

I passed the e.FindREsults to the getData function in the feature class and the double list is populated.
I used:

Public Shared Function GetData(ByVal data As Object) As IEnumerable(Of Feature)
        Dim list As New List(Of Feature)

        'list.Add(New Feature With {._featureLayerName = "FeatureLayerName1", ._featureLayerItemCount = "5 feature(s) found"})

        'list(0)._featureItems.Add(New FeatureItem With {.Name = "1FeatureItemName1", .Owner = "FeatureItemOwner"})
        'list(0)._featureItems.Add(New FeatureItem With {.Name = "2FeatureItemName2", .Owner = "FeatureItemOwner"})
        'list(0)._featureItems.Add(New FeatureItem With {.Name = "3FeatureItemName3", .Owner = "FeatureItemOwner"})
        'list(0)._featureItems.Add(New FeatureItem With {.Name = "4FeatureItemName4", .Owner = "FeatureItemOwner"})
        'list(0)._featureItems.Add(New FeatureItem With {.Name = "5FeatureItemName5", .Owner = "FeatureItemOwner"})

        Dim i As Integer = -1
        Dim CurrentLayer As String = ""
        For Each elem As ESRI.ArcGIS.Client.Tasks.FindResult In data
            If String.Compare(CurrentLayer, elem.LayerName, System.StringComparison.OrdinalIgnoreCase) <> 0 Then
                list.Add(New Feature With {._featureLayerName = elem.LayerName, ._featureLayerItemCount = "5 feature(s) found"})
                CurrentLayer = elem.LayerName
                i = i + 1
            End If

            list(i)._featureItems.Add(New FeatureItem With {.Name = elem.DisplayFieldName, .Owner = elem.Value})

        Next
Return list
    End Function

Now I got the list almost as I like it.
I need specifics fields from the layer instead what I am getting is the fields that have the information searched.
Also I need functionalities when mouse over the list item to displaythe feaures it in the map. How I could do that? I had this working using the grid.

THanks a lot for your help!!!!
Maria

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

MariaFernandez — Wed, 09 Mar 2011 13:40:54 GMT

Additionally to this,
How we can search only in the visible layers?
Instead of
findParameters.LayerIds.AddRange(New Integer() {0, 1, 2, 3})

search in the visible only.

Thanks!!!!

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

DominiqueBroux — Wed, 09 Mar 2011 13:52:15 GMT

I need specifics fields from the layer instead what I am getting is the fields that have the information searched.

The FindResult object contains a feature object with all its attributes. So you can extend your FeatureItem to store other attributes:
.OtherAttribute = .elem.Feature.Attributes["AttributeName"]

or even to store the whole Feature:
.Feature= .elem.Feature

Also I need functionalities when mouse over the list item to display the feaures it in the map. How I could do that?

That will be easier if you store the Feature in your FeatureItem. So (as in the sample) from the SelectedItem, you can retrieve the Feature and show it in a graphics layer.

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

MariaFernandez — Wed, 09 Mar 2011 17:35:04 GMT

Thanks a lot!!
Using the Feature.Attributes I got the info I needed:

list(i)._featureItems.Add(New FeatureItem With {.Name = elem.Feature.Attributes("NAME").ToString, .Owner = elem.Feature.Attributes("OWNER").ToString})
list(i)._featureLayerItemCount = ItemLayerCounter.ToString & " feature(s) found"

Thanks!!

I also need the legend dymbol for the layer. The image I have in the feature class is to store the legend symbol for the layer. How we can access that information?

Thank you very much for all your help!!!

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

MariaFernandez — Thu, 10 Mar 2011 11:45:47 GMT

The FindResult object contains a feature object with all its attributes. So you can extend your FeatureItem to store other attributes:
.OtherAttribute = .elem.Feature.Attributes["AttributeName"]

or even to store the whole Feature:
.Feature= .elem.Feature

That will be easier if you store the Feature in your FeatureItem. So (as in the sample) from the SelectedItem, you can retrieve the Feature and show it in a graphics layer.

I already added the Feature to the FeatureItem class. Now I need to add a MouseEnter/Leave event to the Listbox that has the result, but this listbox is defined inside the DataTemplate. How and where I could add those event?
THANKS !!!!

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

DominiqueBroux — Sat, 11 Dec 2021 15:44:47 GMT

I also need the legend dymbol for the layer. The image I have in the feature class is to store the legend symbol for the layer. How we can access that information?

If you have included a legend control in your application, you can use it to get the swatches of the sublayers (look at this thread http://forums.arcgis.com/threads/23147-populating-sublayers-on-a-listbox-along-with-the-symbols) else you could call QueryLegendInfos of the service by yourself.

Now I need to add a MouseEnter/Leave event to the Listbox that has the result, but this listbox is defined inside the DataTemplate. How and where I could add those event?

Why not just hook up your handler in XAML?

 
<DataTemplate x:Key="FeatureItemDataTemplate">
<Grid MouseEnter="Grid_MouseEnter">
........

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

MariaFernandez — Sat, 11 Dec 2021 15:44:49 GMT

If you have included a legend control in your application, you can use it to get the swatches of the sublayers (look at this thread http://forums.arcgis.com/threads/23147-populating-sublayers-on-a-listbox-along-with-the-symbols) else you could call QueryLegendInfos of the service by yourself.

Why not just hook up your handler in XAML?
 
<DataTemplate x:Key="FeatureItemDataTemplate">
<Grid MouseEnter="Grid_MouseEnter">
........

I have defined the DataTemplate as a Resource. When I add the event declaration there I got errors, where I can defined it in the App.xaml?
Or you think is better to move the whole dataTemplate back to the page and have it locally?
Or declare the event in the class and bind in the dataTemplate?

Thanks a lot for your help!!!

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

MariaFernandez — Fri, 11 Mar 2011 12:08:08 GMT

Thanks a lot!!!!!!!
It is working now!!
I had to move the DataTemplate to inside the control to be able to add the SelectionChange event to the inner ListBox control. Later I will isolated this example to try to put back the DataTemplate in a asset (as a resource) as before (what I am missing is be able to call or bind an event (and I need to know where we have to define it) inside a DataTemplate defined as resource).
For now the list is working.

Once again THANK YOU!!!!!!!!

<ListBox x:Name="SearchListBox" Background="White"
                                             ItemsSource="{Binding}"

                                             VerticalAlignment="Top"    >
                                    <ListBox.ItemsPanel>
                                        <ItemsPanelTemplate >
                                            <StackPanel Orientation="Horizontal" />
                                        </ItemsPanelTemplate>
                                    </ListBox.ItemsPanel>
                                    <ListBox.ItemTemplate >
                                        <DataTemplate >
                                            <Grid Width="auto">
                                                <Grid.RowDefinitions>
                                                    <RowDefinition Height="Auto"/>
                                                    <RowDefinition Height="Auto"/>
                                                    <RowDefinition Height="85"/>
                                                    <RowDefinition/>
                                                </Grid.RowDefinitions>
                                                <Grid.ColumnDefinitions>
                                                    <ColumnDefinition Width="Auto"/>
                                                    <ColumnDefinition Width="Auto"/>

                                                </Grid.ColumnDefinitions>
                                                <Border BorderThickness="3" Grid.RowSpan="2" Grid.Column="0" >
                                                    <Image Source="{Binding SymbolLayer}" Stretch="Fill"   />
                                                </Border>

                                                <dataInput:Label Content="{Binding FeatureLayerName}" Grid.Row="0" Grid.Column="1" />
                                                <dataInput:Label Content="{Binding FeatureLayerItemCount}" Grid.Row="1" Grid.Column="1"/>

                                                <ListBox x:Name="LBFeatureItems" Padding="2" Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2"
                                                     ItemsSource ="{Binding Path=FeatureItems}"
                                                     SelectionChanged="LBFeatureItems_SelectionChanged"
                                                     >
                                                    <ListBox.ItemTemplate >
                                                        <DataTemplate >
                                                            <Grid   >
                                                                <Grid.ColumnDefinitions>
                                                                    <ColumnDefinition Width="50"/>
                                                                    <ColumnDefinition Width="100"/>
                                                                </Grid.ColumnDefinitions>
                                                                <Grid.RowDefinitions >
                                                                    <RowDefinition ></RowDefinition>
                                                                    <RowDefinition ></RowDefinition>
                                                                </Grid.RowDefinitions>
                                                                <sdk:Label x:Name="labelName" Content="Name:" Grid.Column="0" Grid.Row="0"/>
                                                                <dataInput:Label Content="{Binding Path=Name}" Grid.Row="0" Grid.Column="1"/>

                                                                <sdk:Label x:Name="labelOwner" Content="Owner:" Grid.Column="0" Grid.Row="1"/>
                                                                <dataInput:Label Content="{Binding Path=Owner}" Grid.Row="1" Grid.Column="1"/>

                                                            </Grid>
                                                        </DataTemplate>
                                                    </ListBox.ItemTemplate>

                                                </ListBox>

                                            </Grid>
                                        </DataTemplate>
                                    </ListBox.ItemTemplate>

                                </ListBox>

THANKS!!!

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

Asgharkhan — Tue, 07 Apr 2015 08:53:16 GMT

@Dominique i want this binding behind C#

How to?

<slData:DataGridTextColumn Binding="{Binding Attributes[FID]}" Header="النتائج" />

Re: Binding search result from FindTask to ListBox using DataTemplate SL4

DominiqueBroux — Tue, 07 Apr 2015 09:11:48 GMT

This thread Defining Results Datagrid In Code behind should help.