ArcServer for Silverlight系列之属性查询

原文地址：http://hi.baidu.com/javacookies/blog/item/aef559a114d6e685461064a8.html 

 

<UserControl x:Class="ArcGISSilverlightSDK.Find"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 

    xmlns:esri="clr-namespace:ESRI.ArcGIS.Client;assembly=ESRI.ArcGIS.Client"

    xmlns:esriSymbols="clr-namespace:ESRI.ArcGIS.Client.Symbols;assembly=ESRI.ArcGIS.Client"

    xmlns:esriConverters="clr-namespace:ESRI.ArcGIS.Client.ValueConverters;assembly=ESRI.ArcGIS.Client"

    xmlns:slData="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data">

    <Grid x:Name="LayoutRoot" Background="#FF5C90B2">

        

        <Grid.Resources>

            <esriSymbols:SimpleMarkerSymbol x:Name="DefaultMarkerSymbol" Size="8" Color="Red" Style="Circle" />

            <esriSymbols:SimpleLineSymbol x:Name="DefaultLineSymbol" Color="Red" Width="6" />

            <esriSymbols:SimpleFillSymbol x:Name="DefaultFillSymbol" BorderBrush="Red" BorderThickness="2" Fill="#50FF0000"/>

            <esriConverters:DictionaryConverter x:Name="MyDictionaryConverter" />

        </Grid.Resources>

        

        <Grid.RowDefinitions>

            <RowDefinition Height="35" />

            <RowDefinition Height="*" />

            <RowDefinition Height="150" />

        </Grid.RowDefinitions>

        <!--查询条件-->

        <Border BorderBrush="Black" BorderThickness="1">

            <StackPanel Orientation="Horizontal" Background="#FF5C90B2" Grid.Row="0" HorizontalAlignment="Left" VerticalAlignment="Top" >

                <TextBlock Text="Search for" Foreground="Black" 

                           HorizontalAlignment="Center" Height="24" VerticalAlignment="Center" 

                           FontWeight="Bold" FontSize="12" Margin="20,8,5,0"/>

                <TextBox x:Name="FindText" Background="White" Text="River" Height="23" Width="100" HorizontalContentAlignment="Center" />

                <TextBlock Text="in the attributes of States or Counties:" Foreground="Black" 

                           HorizontalAlignment="Center" Height="24" VerticalAlignment="Center" 

                           FontWeight="Bold" FontSize="12" Margin="5,8,5,0"/>

                <Button x:Name="ExecuteButton" Content="Find" Width="75" Height="24" VerticalAlignment="Center" Click="ExecuteButton_Click" 

                        Margin="5,0,5,0" Cursor="Hand" />

            </StackPanel>

        </Border>

        <!--地图控件-->

        <esri:Map x:Name="MyMap" Background="White" Grid.Row="1" Extent="-125, 25, -65, 55">

            <esri:Map.Layers>

                <esri:ArcGISTiledMapServiceLayer ID="TopoLayer" 

                    Url="http://server.arcgisonline.com/ArcGIS/rest/services/NGS_Topo_US_2D/MapServer"/>

                <esri:ArcGISDynamicMapServiceLayer ID="DemographicLayer" Opacity="0.2"

                    Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer" VisibleLayers="4,5" />      

                <esri:GraphicsLayer ID="MyGraphicsLayer" />

            </esri:Map.Layers>

        </esri:Map>        

        <!--查询结果GIRD控件-->

        <slData:DataGrid x:Name="FindDetailsDataGrid" AutoGenerateColumns="False" HeadersVisibility="All" Background="White" 

                         BorderBrush="Black" BorderThickness="1" SelectionChanged="FindDetails_SelectionChanged" 

                         HorizontalAlignment="Left" HorizontalScrollBarVisibility="Hidden" Grid.Row="2" Width="Auto"

                         IsReadOnly="True">

            <slData:DataGrid.Columns>

                <slData:DataGridTextColumn Width="65" Binding="{Binding Path=LayerId}" Header="Layer ID" />

                <slData:DataGridTextColumn Width="90" Binding="{Binding Path=LayerName}" Header="Layer Name"/>

                <slData:DataGridTextColumn Width="80" Binding="{Binding Path=FoundFieldName}" Header="Found Field" />

                <slData:DataGridTextColumn Width="80" Binding="{Binding Path=Value}" Header="Value"/>

                <slData:DataGridTextColumn Width="120" Binding="{Binding Converter={StaticResource MyDictionaryConverter},

                    ConverterParameter=STATE_NAME, Mode=OneWay, Path=Feature.Attributes}" Header="State Name"/>

            </slData:DataGrid.Columns>

        </slData:DataGrid>        

    </Grid>

</UserControl> 

 using System.Windows;

using System.Windows.Controls;
using System.Windows.Data;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Tasks;

namespace ArcGISSilverlightSDK
{
    public partial class Find : UserControl
    {
        public Find()
        {
            InitializeComponent();
        }
//查询
        private void ExecuteButton_Click(object sender, RoutedEventArgs e)
        {
            GraphicsLayer graphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;
            graphicsLayer.ClearGraphics();

            FindTask findTask = new FindTask("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/" +
                "Demographics/ESRI_Census_USA/MapServer");
            findTask.Failed += FindTask_Failed;

            FindParameters findParameters = new FindParameters();
            // 查询的层列表
            findParameters.LayerIds.AddRange(new int[] { 3, 5 });
            // 查询的字段列表
            findParameters.SearchFields.AddRange(new string[] { "NAME", "STATE_NAME", "STATE_ABBR", "TRACT", "BLOCK", "BLKGRP" });

            // 绑定查询结果到GRID 
            Binding resultFeaturesBinding = new Binding("LastResult");
            resultFeaturesBinding.Source = findTask;
            FindDetailsDataGrid.SetBinding(DataGrid.ItemsSourceProperty, resultFeaturesBinding);
     //查询条件
            findParameters.SearchText = FindText.Text;
            //执行查询
            findTask.ExecuteAsync(findParameters);
        }
        private void FindDetails_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            //高亮显示被选中记录对应的图元
            DataGrid dataGrid = sender as DataGrid;
            int selectedIndex = dataGrid.SelectedIndex;
            if (selectedIndex > -1)
            {
                FindResult findResult = (FindResult)FindDetailsDataGrid.SelectedItem;
                Graphic graphic = findResult.Feature;
                switch (graphic.Attributes["Shape"].ToString())
                {
                    case "Polygon":
                        graphic.Symbol = DefaultFillSymbol;
                        break;
                    case "Polyline":
                        graphic.Symbol = DefaultLineSymbol;
                        break;
                    case "Point":
                        graphic.Symbol = DefaultMarkerSymbol;
                        break;
                }
                GraphicsLayer graphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;
                graphicsLayer.ClearGraphics();
                graphicsLayer.Graphics.Add(graphic);
            }
        }

        private void FindTask_Failed(object sender, TaskFailedEventArgs args)
        {
            MessageBox.Show("Find failed: " + args.Error.Message);
        }
    }
}