Silverlight 在运行时更改 ControlTemplate
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You cannot create a ControlTemplate in Silverlight in C# alone. Unlike WPF (where you can set the VisualTree property), there is no property you can set that specifies the "content" of the ControlTemplate.
You can define your XAML as a string, and then load that dynamically in C# as explained by this blog post.
The code boils down to:
var template = (ControlTemplate)XamlReader.Load("<ControlTemplate " +
" xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\"" +
" xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\">" +
" content here " +
"</ControlTemplate>");
这是在 stackoverflow 找到的回答。XamlReader.Load(string xaml)，这个xaml有限制，不能写 x:Name ，例如“<ControlTemplate x:Name=\"ctName\"，这样写运行时报错。我找到的解决办法：
建立资源文件，将需要运行时修改的设计代码写入资源文件中。例如：
<?
xml version="1.0" encoding="utf-8"
?>
<
esri:SimpleFillSymbol
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"
xmlns:esri
="http://schemas.esri.com/arcgis/client/2009"
>
<
esri:SimpleFillSymbol.ControlTemplate
>
<
ControlTemplate
>
<
Path
x:Name
="Element"
Fill
="Red"
Stroke
="White"
StrokeThickness
="0.4"
Cursor
="Hand"
>
<
VisualStateManager.VisualStateGroups
>
<
VisualStateGroup
x:Name
="SelectionStates"
>
<
VisualState
x:Name
="Unselected"
>
<
Storyboard
>
<
ColorAnimation
Storyboard.TargetName
="Element"
Storyboard.TargetProperty
="(Path.Stroke).(SolidColorBrush.Color)"
To
="White"
Duration
="0:0:.25"
/>
<
DoubleAnimation
Storyboard.TargetName
="Element"
Storyboard.TargetProperty
="StrokeThickness"
To
="0.4"
Duration
="00:00:.25"
/>
<
DoubleAnimation
Storyboard.TargetName
="Element"
Storyboard.TargetProperty
="Opacity"
To
="0.5"
Duration
="00:00:.25"
/>
</
Storyboard
>
</
VisualState
>
<
VisualState
x:Name
="Selected"
>
<
Storyboard
>
<
ColorAnimation
Storyboard.TargetName
="Element"
Storyboard.TargetProperty
="(Path.Stroke).(SolidColorBrush.Color)"
To
="Black"
Duration
="0:0:.25"
/>
<
DoubleAnimation
Storyboard.TargetName
="Element"
Storyboard.TargetProperty
="StrokeThickness"
To
="3"
Duration
="00:00:.25"
/>
<
DoubleAnimation
Storyboard.TargetName
="Element"
Storyboard.TargetProperty
="Opacity"
To
="1"
Duration
="00:00:.25"
/>
</
Storyboard
>
</
VisualState
>
</
VisualStateGroup
>
</
VisualStateManager.VisualStateGroups
>
</
Path
>
</
ControlTemplate
>
</
esri:SimpleFillSymbol.ControlTemplate
>
</
esri:SimpleFillSymbol
>
我需要运行时修改 Fill="Red" ，这个颜色。建立资源文件：ArcFill.xaml，将代码写入，设置 ArcFill.xaml 的属性：生成操作 为 嵌入的资源，以供读取使用。
读取资源文件：
StreamReader reader = new StreamReader(System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("StMap.Resource.ArcFill.xaml")); string strArcFill = reader.ReadToEnd();
SimpleFillSymbol sfs = XamlReader.Load(strArcFill) as SimpleFillSymbol;
资源文件文件中虽然包括了x:Name，但这样 XamlReader.Load 读取却没有任何问题。如果想改变颜色：
XamlReader.Load(strArcFill.Replace("Red", "Green")) as SimpleFillSymbol
这样直接查找替换，工作的很 OK，红色成功变成了绿色，完整的测试用代码：
StreamReader reader = new StreamReader(System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("StMap.Resource.ArcFill.xaml")); string strArcFill = reader.ReadToEnd(); ClassBreaksRenderer newClassBreaksRenderer = new ClassBreaksRenderer(); newClassBreaksRenderer.Field = "投诉量"; newClassBreaksRenderer.Classes.Add(new ClassBreakInfo() { MinimumValue = 0, MaximumValue = 250, Symbol = XamlReader.Load(strArcFill.Replace("Red", "Blue")) as SimpleFillSymbol }); newClassBreaksRenderer.Classes.Add(new ClassBreakInfo() { MaximumValue = 500, Symbol = XamlReader.Load(strArcFill.Replace("Red", "Green")) as SimpleFillSymbol }); newClassBreaksRenderer.Classes.Add(new ClassBreakInfo() { MaximumValue = 750, Symbol = XamlReader.Load(strArcFill.Replace("Red", "Goldenrod")) as SimpleFillSymbol }); PictureMarkerSymbol p = new PictureMarkerSymbol(); newClassBreaksRenderer.Classes.Add(new ClassBreakInfo() { MaximumValue = 1000, Symbol = XamlReader.Load(strArcFill.Replace("Red", "DarkOrchid")) as SimpleFillSymbol }); newClassBreaksRenderer.Classes.Add(new ClassBreakInfo() { MaximumValue = 9999999, Symbol = XamlReader.Load(strArcFill.Replace("Red", "Red")) as SimpleFillSymbol }); GraphicsLayer graphicsLayer = MyMap.Layers["CY_L1"] as GraphicsLayer; graphicsLayer.Renderer = newClassBreaksRenderer;
效果图：
原文：http://www.cnblogs.com/tails/p/4485621.html
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