两种方式 用 ArCGIS API for Silverlight增加标注

1，作为每个标注作为元素进行添加，在ElmentLayer可以放任何SL的控件，可操作性比较强，用起来也比较灵活。可以利用Elment 实现，InfoWindow，tip等功能，当然实现标注可是小菜一碟，
先定义一个UserControl ，XAML 如下

<UserControl x:Class="VolunteerAction.MyInfoWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="{x:Null}" Height="62" Width="290">
<TextBlock  HorizontalAlignment="Right" TextWrapping="Wrap"  VerticalAlignment="Top"  Height="61" Name="textBlock1" Text="TextBlock"  Width="114" FontSize="18" FontStyle="Italic" FontWeight="Bold" FontFamily="Arial" />
</Grid>
</UserControl>

cs 文件如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace VolunteerAction
{
public partial class MyInfoWindow : UserControl
{
public MyInfoWindow()
{
InitializeComponent();
Storyboard sd = new Storyboard();
sd.AutoReverse = true;
ColorAnimation c = new ColorAnimation();
c.From = Color.FromArgb(255, 255, 0, 0);
c.To = Color.FromArgb(255, 255, 255, 255);
c.Duration = new Duration(new TimeSpan(0,0,0,1,500));
c.RepeatBehavior = RepeatBehavior.Forever;
Storyboard.SetTarget(c, textBlock1);
Storyboard.SetTargetProperty(c, new PropertyPath("(TextBlock.ForeGround).(SolidColorBrush.Color)"));
sd.Children.Add(c);
sd.Begin();
}
}
}

主要功能是使textbox1中的文本闪烁

为Map 增加一个Element的Layer

ElementLayer()    _elementLayer = new ElementLayer();
Mymap .Layers.Add(_elementLayer);
MapPoint addpt =(MapPoint) g1.Geometry;
MyInfoWindow m = new MyInfoWindow();
m.textBlock1.Text = g.Attributes["Name"].ToString();
ElementLayer.SetEnvelope(m, new Envelope(addpt, addpt));
_elementLayer.Children.Add(m);

第二种方法，使用TextSymbol 符号化graphic,、

具体代码 如下

XAML

<UserControl xmlns:esri="http://schemas.esri.com/arcgis/client/2009"  x:Class="addLabel.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">

<Grid x:Name="LayoutRoot" Background="White">
<esri:Map Extent="13233421.4187963, 3713635.69873,13361710.4066037,3805303.59307" Background="White" x:Name="map"  WrapAround="True">
<esri:Map.Layers>
<esri:LayerCollection>

<esri:ArcGISTiledMapServiceLayer  Url="http://www.arcgisonline.cn/ArcGIS/rest/services/ChinaOnlineStreetCold/MapServer" />
<esri:FeatureLayer ID="Mylayer"  Url="http://tm.arcgisonline.cn:8038/ags10/rest/services/zjPoint/MapServer/0" OutFields="*"></esri:FeatureLayer>
</esri:LayerCollection>
</esri:Map.Layers>
</esri:Map>
<Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="48,117,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
</Grid>
</UserControl>

cs内容如下

namespace addLabel
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}

private void button1_Click(object sender, RoutedEventArgs e)
{
FeatureLayer mylayer = map.Layers["Mylayer"] as FeatureLayer;
GraphicCollection gs = mylayer.Graphics;
GraphicsLayer layer=new GraphicsLayer ();

foreach (Graphic g in gs)
{
Graphic g1 = new Graphic();
g1.Geometry=g.Geometry;
Brush  b=new SolidColorBrush(Color.FromArgb(100,0,0,255));
g1.Symbol = new TextSymbol() { Text = g.Attributes["Name_PY"].ToString().Substring(0,5), Foreground=b, FontSize=20  };

layer.Graphics.Add(g1);
}
map.Layers.Add(layer);
}

}