Silverlight中根据绑定内容动态生成模板

     最近在做Silverlight项目时，需要根据绑定的内容动态生成不同的模板。如是在网上找了下，发现这个不错，如是把例子总结了下。代码和注释如下。

(1)ObservabLeobject.cs类

//具有<a href="http://code.js-code.com/tag/tongzhi/" target="_blank" class="keywords">通知</a><a href="http://code.js-code.com/tag/gongneng/" target="_blank" class="keywords">功能</a>的Observab<a href="http://code.js-code.com/tag/Leo/" target="_blank" class="keywords">Leo</a>b<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct的类 //其实可以将NotifyPropertyChanged写在City中，但这样以类的形式写更具有扩展性 public class Observab<a href="http://code.js-code.com/tag/Leo/" target="_blank" class="keywords">Leo</a>b<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct : INotifyPropertyChanged <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged(ob<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct sender,<a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng property<a href="http://code.js-code.com/tag/Name/" target="_blank" class="keywords">Name)</a> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> if (PropertyChanged <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">!=</a> null) PropertyChanged(sender,new PropertyChangedEventArgs(property<a href="http://code.js-code.com/tag/Name/" target="_blank" class="keywords">Name)</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } }

(2)City.cs类

//实体City public class City : Observab<a href="http://code.js-code.com/tag/Leo/" target="_blank" class="keywords">Leo</a>b<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> private <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng _Name; private <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng _Country; //城市<a href="http://code.js-code.com/tag/mingcheng/" target="_blank" class="keywords">名称</a> public <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng Name <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> return _Name; } set <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> if (_Name <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">!=</a> <a href="http://code.js-code.com/tag/value/" target="_blank" class="keywords">value)</a> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> _Name = value; NotifyPropertyChanged(this,"Name"<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } } } //国家<a href="http://code.js-code.com/tag/mingcheng/" target="_blank" class="keywords">名称</a> public <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng Country <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> return _Country; } set <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> if (_Country <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">!=</a> <a href="http://code.js-code.com/tag/value/" target="_blank" class="keywords">value)</a> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> _Country = value; NotifyPropertyChanged(this,"Country"<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } } } }

（3）DataTemplateSELEctor.cs类

public abstract class DataTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor : ContentControl <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> public virtual DataTemplate <a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctTemplate(ob<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct item,DependencyOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct container) <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> return null; } //重写OnContentChanged<a href="http://code.js-code.com/tag/fangfa/" target="_blank" class="keywords">方法</a> protected override void OnContentChanged(ob<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct oldContent,ob<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct newContent) <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> base<a href="http://code.js-code.com/tag/o/" target="_blank" class="keywords">.o</a>nContentChanged(oldContent,newContent<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> ContentTemplate = <a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctTemplate(newContent,this<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } }

（4）CountryTemplateSELEctor.cs类

public class CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor : DataTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> //定义Brazil,Usa,England三个不同国家模板 public DataTemplate BrazilTemplate <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } public DataTemplate UsaTemplate <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } public DataTemplate EnglandTemplate <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } //由城市实体-->实体所在国家-->所在国家的模板 public override DataTemplate <a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctTemplate( ob<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct item,DependencyOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct container) <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> City itemAux = item as City; if (itemAux <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">!=</a> null) <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> if (itemAux.Country == "Brazil") return BrazilTemplate; if (itemAux.Country == "USA") return UsaTemplate; if (itemAux.Country == "England") return EnglandTemplate; } return base.<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctTemplate(item,container<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } }

（5）Mainviewmodel.cs类

//Cites<a href="http://code.js-code.com/tag/shuxing/" target="_blank" class="keywords">属性</a> public ObservableCollection<City> Cities <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } //数据集 public Main<a href="http://code.js-code.com/tag/viewmode/" target="_blank" class="keywords">viewmode</a>l() <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Cities = new ObservableCollection<City>(<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "Brazil",Name = "São Paulo" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "Brazil",Name = "Curitiba" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "Brazil",Name = "Rio de Janeiro" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "Brazil",Name = "Salvador" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "Brazil",Name = "Recife" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "USA",Name = "San Francisco" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "USA",Name = "Los Angeles" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "USA",Name = "New York" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "USA",Name = "Chicago" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "USA",Name = "Houston" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> Citie<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add(new City <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Country = "England",Name = "London" }<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } }

（6）MainPage.xaml

<UserControl x:Class="DataTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor.MainPage" xmlns="<a href="http://code.js-code.com/tag/http/" target="_blank" class="keywords">http</a>://<a href="http://code.js-code.com/tag/sche/" target="_blank" class="keywords">sche</a>R_898_11845@a<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>microsoft.com/winfx/2006/xaml/presentation" xmlns:x="<a href="http://code.js-code.com/tag/http/" target="_blank" class="keywords">http</a>://<a href="http://code.js-code.com/tag/sche/" target="_blank" class="keywords">sche</a>R_898_11845@a<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>microsoft.com/winfx/2006/xaml" xmlns:d="<a href="http://code.js-code.com/tag/http/" target="_blank" class="keywords">http</a>://<a href="http://code.js-code.com/tag/sche/" target="_blank" class="keywords">sche</a>R_898_11845@a<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>microsoft.com/expression/blend/2008" xmlns:mc="<a href="http://code.js-code.com/tag/http/" target="_blank" class="keywords">http</a>://<a href="http://code.js-code.com/tag/sche/" target="_blank" class="keywords">sche</a>R_898_11845@a<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>openxmlformat<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>org/markup-compatibility/2006" xmlns:local="clr-namespace:DataTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" <a href="http://code.js-code.com/tag/BAC/" target="_blank" class="keywords">BAC</a>kground="White"> <List<a href="http://code.js-code.com/tag/Box/" target="_blank" class="keywords">Box</a> Items<a href="http://code.js-code.com/tag/sourc/" target="_blank" class="keywords">sourc</a>e="<a href="http://code.js-code.com/tag/B/" target="_blank" class="keywords">{B</a>inding Cities}" HorizontalContentAlignment="Stretch" x:Name="LB"> <List<a href="http://code.js-code.com/tag/Box/" target="_blank" class="keywords">Box</a>.ItemTemplate> <DataTemplate> <local:CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor Content="<a href="http://code.js-code.com/tag/B/" target="_blank" class="keywords">{B</a>inding}"> <local:CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>razilTemplate> <DataTemplate> <Grid <a href="http://code.js-code.com/tag/BAC/" target="_blank" class="keywords">BAC</a>kground="Green"> <TextBlock Text="<a href="http://code.js-code.com/tag/B/" target="_blank" class="keywords">{B</a>inding Nam<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E}</a>"/> </Grid> </DataTemplate> </local:CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>razilTemplate> <local:CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor.UsaTemplate> <DataTemplate> <Grid <a href="http://code.js-code.com/tag/BAC/" target="_blank" class="keywords">BAC</a>kground="Blue"> <TextBlock Text="<a href="http://code.js-code.com/tag/B/" target="_blank" class="keywords">{B</a>inding Nam<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E}</a>"/> </Grid> </DataTemplate> </local:CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor.UsaTemplate> <local:CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor.EnglandTemplate> <DataTemplate> <Grid <a href="http://code.js-code.com/tag/BAC/" target="_blank" class="keywords">BAC</a>kground="Red"> <TextBlock Text="<a href="http://code.js-code.com/tag/B/" target="_blank" class="keywords">{B</a>inding Nam<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E}</a>"/> </Grid> </DataTemplate> </local:CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor.EnglandTemplate> </local:CountryTemplate<a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ctor> </DataTemplate> </List<a href="http://code.js-code.com/tag/Box/" target="_blank" class="keywords">Box</a>.ItemTemplate> </List<a href="http://code.js-code.com/tag/Box/" target="_blank" class="keywords">Box</a>> </Grid> </UserControl>

(7)MainPage.cs

public partial class MainPage : UserControl <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> public MainPage() <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> InitializeComponent(<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> thi<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Loaded += new RoutedEventHandler(MainPage_Loaded<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } //根据MainPage.xaml中List<a href="http://code.js-code.com/tag/Box/" target="_blank" class="keywords">Box</a>已设置好的三个国家的模板，绑定之后所属三个不同城市的名字都会 //<a href="http://code.js-code.com/tag/jiashang/" target="_blank" class="keywords">加上</a>不同国家的颜色了Brazil（Green）,Usa(Blu<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E)</a>,England(Red) void MainPage_Loaded(ob<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct sender,RoutedEventArgs <a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E)</a> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> LB.Items<a href="http://code.js-code.com/tag/sourc/" target="_blank" class="keywords">sourc</a>e = new Main<a href="http://code.js-code.com/tag/viewmode/" target="_blank" class="keywords">viewmode</a>l().Cities; } //总结：根据绑定的数据类容，动态选择不同的模板确实很有用，例如：我们要复用<a href="http://code.js-code.com/tag/yige/" target="_blank" class="keywords">一个</a>控件，而控件<a href="http://code.js-code.com/tag/neirong/" target="_blank" class="keywords">内容</a>可能完全不一样，使用这种<a href="http://code.js-code.com/tag/fangfa/" target="_blank" class="keywords">方法</a>可以达到更具你要加载的<a href="http://code.js-code.com/tag/neirong/" target="_blank" class="keywords">内容</a>来创建控件。 }

源码下载页面：http://download.csdn.net/source/2684599