查询

最新推荐文章于 2025-04-23 05:00:00 发布

转载最新推荐文章于 2025-04-23 05:00:00 发布 · 52 阅读

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原文链接：http://www.cnblogs.com/qianlvdong/p/4227621.html

本文提供了一个使用查询任务不带地图的ArcGIS Silverlight SDK示例，包括用户控件的XAML代码、关键类定义和事件处理逻辑。展示了如何创建查询任务、执行查询并显示查询结果。

<UserControl x:Class="ArcGISSilverlightSDK.QueryWithoutMap"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:esri="http://schemas.esri.com/arcgis/client/2009"
    xmlns:slData="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data">
    <Grid x:Name="LayoutRoot" Background="White">
        
        <Canvas x:Name="ResultsDisplayCanvas" HorizontalAlignment="Center" VerticalAlignment="Top" Width="547" Height="200" Margin="0,30,0,0" >
            <Rectangle Stroke="Gray"  RadiusX="10" RadiusY="10" Fill="#77919191" Canvas.Left="0" Canvas.Top="0" Width="547" Height="200" >
                <Rectangle.Effect>
                    <DropShadowEffect/>
                </Rectangle.Effect>
            </Rectangle>
            <Rectangle Fill="#FFFFFFFF" Stroke="DarkGray" RadiusX="5" RadiusY="5" Canvas.Left="10" Canvas.Top="20" Width="530" Height="170"  />
            <TextBlock x:Name="DataDisplayTitle" Text="Using Query tasks without maps" Foreground="White" FontSize="9" Canvas.Left="10" Canvas.Top="4" FontWeight="Bold" />
            <StackPanel Orientation="Horizontal" Margin="5,0,15,0" Canvas.Top="25" >
                <TextBlock Text="US State Name contains:" Margin="10,0,0,0" VerticalAlignment="Center"/>
                <TextBox x:Name="StateNameTextBox" Text="New" Height="23" HorizontalAlignment="Left" VerticalAlignment="Center" Width="125" TextWrapping="NoWrap" 
                     Margin="10,0,10,0" FontSize="12" Background="White" AcceptsReturn="False" />
                <Button Content="Do Query" Width="75" VerticalAlignment="Center" HorizontalAlignment="Right" Click="QueryButton_Click" Margin="0,0,10,0" Cursor="Hand" />
            </StackPanel>
            
            <slData:DataGrid x:Name="QueryDetailsDataGrid" AutoGenerateColumns="False" HeadersVisibility="Column" Background="White"
                             IsReadOnly="True" Canvas.Left="10" Canvas.Top="50" Height="140" Width="530"
                             HorizontalScrollBarVisibility="Hidden">
                <slData:DataGrid.Columns>
                    <slData:DataGridTextColumn Width="85" Binding="{Binding Attributes[STATE_NAME]}" Header="State Name"/>
                    <slData:DataGridTextColumn Width="110" Binding="{Binding  Attributes[SUB_REGION] }" Header="Region"/>
                    <slData:DataGridTextColumn Width="45" Binding="{Binding  Attributes[STATE_FIPS] }" Header="FIPS"/>
                    <slData:DataGridTextColumn Width="85" Binding="{Binding  Attributes[STATE_ABBR] }" Header="Abbreviation"/>
                    <slData:DataGridTextColumn Width="103" Binding="{Binding  Attributes[POP2000] }" Header="Population 2000"/>
                    <slData:DataGridTextColumn Width="102" Binding="{Binding  Attributes[POP2007] }" Header="Population 2007"/>
                </slData:DataGrid.Columns>
            </slData:DataGrid>
        </Canvas>
        
    </Grid>
</UserControl>

using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Tasks;

namespace ArcGISSilverlightSDK
{
    public partial class QueryWithoutMap : UserControl
    {
        public QueryWithoutMap()
        {
            InitializeComponent();
        }

        void QueryButton_Click(object sender, RoutedEventArgs e)
        {
            QueryTask queryTask = 
                new QueryTask("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5");
            queryTask.ExecuteCompleted += QueryTask_ExecuteCompleted;
            queryTask.Failed += QueryTask_Failed;

            ESRI.ArcGIS.Client.Tasks.Query query = new ESRI.ArcGIS.Client.Tasks.Query();
            query.Text = StateNameTextBox.Text;

            query.OutFields.Add("*");
            queryTask.ExecuteAsync(query);
        }

        void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)
        {
            FeatureSet featureSet = args.FeatureSet;

            if (featureSet != null && featureSet.Features.Count > 0)
                QueryDetailsDataGrid.ItemsSource = featureSet.Features;
            else
                MessageBox.Show("No features returned from query");
        }

        private void QueryTask_Failed(object sender, TaskFailedEventArgs args)
        {
            MessageBox.Show("Query execute error: " + args.Error);
        }
    }
}

转载于:https://www.cnblogs.com/qianlvdong/p/4227621.html