arcgis for silverlight 中修改DataTemplate解决思路

来源：互联网发布：银联数据待遇编辑：程序博客网时间：2024/04/30 11:36

最近又开始捣鼓silverlight，其中一个问题是修改DataTemplate，控件中的值，用一下方法虽然可以获取值，但是无法修改值：

System.Windows.DataTemplate dt2 = LayoutRoot.Resources["MyFeatureLayerInfoWindowTemplate"] as System.Windows.DataTemplate;

StackPanel panel2 = (StackPanel)dt2.LoadContent();
TextBlock tbCategory2 = panel2.FindName("text1") as TextBlock;

因此改变了思路，就是动态添加DataTemplate，首先创建DataTemplate，然后动态绑定到控件，这样就是先修改值，在绑定的思路，例子如下：

        <Grid.Resources>
            <esri:SimpleRenderer x:Key="MySimpleRenderer">
                <esri:SimpleRenderer.Symbol>
                    <esri:SimpleFillSymbol Fill="#01FFFFFF" BorderBrush="#88000000" BorderThickness="2" />
                </esri:SimpleRenderer.Symbol>
            </esri:SimpleRenderer>

        <esri:Map x:Name="MyMap" WrapAround="True" Extent="-15000000,2000000,-7000000,8000000" MouseClick="MyMap_MouseClick">
            <esri:ArcGISTiledMapServiceLayer ID="Street Map"
                    Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>
            <esri:FeatureLayer ID="MyFeatureLayer"
                               Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5"
                               OutFields="STATE_NAME,POP2007"
                               Renderer="{StaticResource MySimpleRenderer}"
                                />
        </esri:Map>

        <esri:InfoWindow x:Name="MyInfoWindow"
                         Padding="2"
                         CornerRadius="20"
                         Background="LightSalmon"
                         Map="{Binding ElementName=MyMap}"

                         MouseLeftButtonUp="MyInfoWindow_MouseLeftButtonUp" />
    </Grid>

</UserControl>

using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Toolkit;
using System.IO;
using System.Windows.Markup;
using System.Text;
namespace SilverlightApplication2
{
    public partial class MainPage : UserControl
    {
        TextBlock tb1 = new TextBlock();
        public MainPage()
        {
            InitializeComponent();

        }

//动态创建模板
private DataTemplate ss()
{

            string xaml = @"<DataTemplate xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
                                                               xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
                                                               xmlns:local=""clr-namespace:GalaxyErp.Module"">

                                           <StackPanel VerticalAlignment=""Stretch"" HorizontalAlignment=""Stretch"">
                                               <TextBlock Text=""{Binding [STATE_NAME]}"" Foreground=""Black"" FontSize=""12"" />
                                              <TextBlock x:Name=""text1"" Text=""4343""></TextBlock>
                                           </StackPanel>
                                       </DataTemplate>";
           // Stream s = new MemoryStream(Encoding.UTF8.GetBytes(xaml));
            return (DataTemplate)XamlReader.Load(xaml);
        }

        private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)
        {

FeatureLayer featureLayer = MyMap.Layers["MyFeatureLayer"] as FeatureLayer;
System.Windows.Point screenPnt = MyMap.MapToScreen(e.MapPoint);

            // Account for difference between Map and application origin
            GeneralTransform generalTransform = MyMap.TransformToVisual(Application.Current.RootVisual);
            System.Windows.Point transformScreenPnt = generalTransform.Transform(screenPnt);

IEnumerable<Graphic> selected =
featureLayer.FindGraphicsInHostCoordinates(transformScreenPnt);

foreach (Graphic g in selected)
{

                MyInfoWindow.Anchor = e.MapPoint;
                MyInfoWindow.IsOpen = true;
                MyInfoWindow.ContentTemplate = ss();//

            string xaml = @"<DataTemplate xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
                                                               xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
                                                               xmlns:local=""clr-namespace:GalaxyErp.Module"">

                                           <StackPanel VerticalAlignment=""Stretch"" HorizontalAlignment=""Stretch"">
                                               <TextBlock Text=""{Binding [STATE_NAME]}"" Foreground=""Black"" FontSize=""12"" />
                                              <TextBlock x:Name=""text1"" Text=""4343""></TextBlock>
                                           </StackPanel>
                                       </DataTemplate>";
           // Stream s = new MemoryStream(Encoding.UTF8.GetBytes(xaml));
            return (DataTemplate)XamlReader.Load(xaml);
        }

        private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)
        {

FeatureLayer featureLayer = MyMap.Layers["MyFeatureLayer"] as FeatureLayer;
System.Windows.Point screenPnt = MyMap.MapToScreen(e.MapPoint);

IEnumerable<Graphic> selected =
featureLayer.FindGraphicsInHostCoordinates(transformScreenPnt);

foreach (Graphic g in selected)
{

                MyInfoWindow.Anchor = e.MapPoint;
                MyInfoWindow.IsOpen = true;
                MyInfoWindow.ContentTemplate = ss();//绑定模板
                //Since a ContentTemplate is defined, Content will define the DataContext for the ContentTemplate
                MyInfoWindow.Content = g.Attributes;
                return;
            }

            InfoWindow window = new InfoWindow()
            {
                Anchor = e.MapPoint,
                Map = MyMap,
                IsOpen = true,
                Placement=InfoWindow.PlacementMode.Auto,
                ContentTemplate = LayoutRoot.Resources["LocationInfoWindowTemplate"] as System.Windows.DataTemplate,
                //Since a ContentTemplate is defined, Content will define the DataContext for the ContentTemplate
                Content = e.MapPoint
            };
            LayoutRoot.Children.Add(window);
        }

        private void MyInfoWindow_MouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            MyInfoWindow.IsOpen = false;
        }

}
}

                //Since a ContentTemplate is defined, Content will define the DataContext for the ContentTemplate
                MyInfoWindow.Content = g.Attributes;
                return;
            }

}
}

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