无废话WPF系列9: Binding的源

1. 绑定到其它元素

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< Grid >      < StackPanel >          < TextBox  x:Name="textbox1" />          < Label  Content="{Binding ElementName=textbox1, Path=Text}" />      </ StackPanel > </ Grid >

2. 绑定到静态资源

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< Window.Resources >          < ContentControl  x:Key="text">Hello, World!</ ContentControl > </ Window.Resources > < Grid >      < StackPanel >          < Label  x:Name="label1" Content="{Binding Source={StaticResource text}}" />      </ StackPanel > </ Grid > < strong >3. 绑定到自身</ strong >

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< Grid >      < StackPanel >          < Label  x:Name="label1" Content="{Binding RelativeSource={RelativeSource Self}, Path=Name}" />      </ StackPanel > </ Grid >

4. 绑定到指定类型的父元素

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< Grid  x:Name="Grid1">          < StackPanel >              < Label  x:Name="label1" Content="{Binding RelativeSource={RelativeSource FindAncestor,                  AncestorType={x:Type Grid}}, Path=Name}" />          </ StackPanel > </ Grid >

 

5. 绑定到对象 

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public  class  Person     {         public  string  Name { get ; set ; }         public  int  Age { get ; set ; }     }

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< StackPanel  x:Name="stackPanel">          < StackPanel.DataContext >              < local:Person  Name="Jack" Age="30"></ local:Person >          </ StackPanel.DataContext >          < TextBlock   Text="{Binding Path=Name}"></ TextBlock >          < TextBlock  Text="{Binding Path=Age}"></ TextBlock >          </ StackPanel >

6. 绑定到集合

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public  class  Person      {          public  string  Name { get ; set ; }          public  int  Age { get ; set ; }      }        public  class  PersonList : ObservableCollection<Person>      { }

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< Window.Resources >         < local:PersonList  x:Key="person">             < local:Person  Name="Jack" Age="30"></ local:Person >             < local:Person  Name="Tom" Age="32"></ local:Person >         </ local:PersonList >     </ Window.Resources >     < StackPanel  x:Name="stackPanel">         < ListBox   ItemsSource="{Binding Source={StaticResource ResourceKey=person}}"                    DisplayMemberPath="Name">                    </ ListBox > </ StackPanel >

 

7. DataContext共享源

我们需要将同一资源绑定到多个 UI 元素上，很显然到处写 "{Binding Source={StaticResource person}}" 是件很繁琐且不利于修改的做法。WPF 提供了一个称之为 "数据上下文 (DataContext)" 的东西让我们可以在多个元素上共享一个源对象，只需将其放到父元素 DataContext 属性即可。当我们不给 Binding 扩展标志指定 Source 属性时，它会自动寻找上级父元素的数据上下文。

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< Window.Resources >          < local:PersonList  x:Key="person">              < local:Person  Name="Jack" Age="30"></ local:Person >              < local:Person  Name="Tom" Age="32"></ local:Person >          </ local:PersonList >      </ Window.Resources >      < StackPanel  x:Name="stackPanel" DataContext="{StaticResource person}">          < ListBox   ItemsSource="{Binding}"                     DisplayMemberPath="Name">                     </ ListBox >      </ StackPanel >

 

8. 使用XML作为Binding的源

XML:

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<? xml  version="1.0" encoding="utf-8" ?> < PersonList >    < Person  Id="1">      < Name >Jack</ Name >    </ Person >    < Person  Id="2">      < Name >Tom</ Name >    </ Person >    < Person  Id="3">      < Name >Justin</ Name >    </ Person >    < Person  Id="4">      < Name >David</ Name >    </ Person > </ PersonList >

XAML:

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< StackPanel >         < ListView  x:Name="personListView">             < ListView.View >                 < GridView >                     < GridViewColumn  Header="Id" Width="100"                                      DisplayMemberBinding="{Binding XPath=@Id}"/>                     < GridViewColumn  Header="Name" Width="100"                                      DisplayMemberBinding="{Binding XPath=Name}"/>                 </ GridView >             </ ListView.View >         </ ListView >            < Button  Click="Button_Click">Load Data</ Button >     </ StackPanel >

后台代码:

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private  void  Button_Click( object  sender, RoutedEventArgs e)          {              XmlDocument xmlDocument = new  XmlDocument();              xmlDocument.Load( "Person.xml" );                XmlDataProvider xdp = new  XmlDataProvider();              xdp.Document = xmlDocument;              xdp.XPath = @"/PersonList/Person" ;                this .personListView.DataContext = xdp;              this .personListView.SetBinding(ListView.ItemsSourceProperty, new  Binding());          }

本文转自敏捷的水博客园博客，原文链接http://www.cnblogs.com/cnblogsfans/archive/2011/02/19/1958586.html如需转载请自行联系原作者

王德水