WPF-Binding的源 - 爱码网

1. 绑定到其它元素

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<Grid> 

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    <StackPanel> 

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        <TextBox x:Name="textbox1" /> 

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        <Label Content="{Binding ElementName=textbox1, Path=Text}" /> 

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    </StackPanel> 

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</Grid>

2. 绑定到静态资源

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<Window.Resources> 

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        <ContentControl x:Key="text">Hello, World!</ContentControl> 

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</Window.Resources> 

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<Grid> 

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    <StackPanel> 

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        <Label x:Name="label1" Content="{Binding Source={StaticResource text}}" /> 

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    </StackPanel> 

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</Grid> 

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<STRONG>3. 绑定到自身</STRONG>

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<Grid> 

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    <StackPanel> 

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

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    </StackPanel> 

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</Grid>

4. 绑定到指定类型的父元素

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<Grid x:Name="Grid1"> 

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        <StackPanel> 

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            <Label x:Name="label1" Content="{Binding RelativeSource={RelativeSource FindAncestor,  

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                AncestorType={x:Type Grid}}, Path=Name}" /> 

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        </StackPanel> 

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</Grid>

5. 绑定到对象

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public class Person  

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   {  

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       public string Name { get; set; }  

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       public int Age { get; set; }  

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   }

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<StackPanel x:Name="stackPanel">  

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        <StackPanel.DataContext>  

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            <local:Person Name="Jack" Age="30"></local:Person>  

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        </StackPanel.DataContext>  

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        <TextBlock  Text="{Binding Path=Name}"></TextBlock>  

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        <TextBlock Text="{Binding Path=Age}"></TextBlock>         

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</StackPanel>

6. 绑定到集合

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public class Person  

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    {  

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        public string Name { get; set; }  

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        public int Age { get; set; }  

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    } 

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    public class PersonList : ObservableCollection<Person>  

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    { }

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<Window.Resources>  

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       <local:PersonList x:Key="person">  

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           <local:Person Name="Jack" Age="30"></local:Person>  

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           <local:Person Name="Tom" Age="32"></local:Person>  

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       </local:PersonList>  

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   </Window.Resources>  

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   <StackPanel x:Name="stackPanel">  

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       <ListBox  ItemsSource="{Binding Source={StaticResource ResourceKey=person}}" 

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                  DisplayMemberPath="Name">             

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       </ListBox>  

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</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>  

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        <local:PersonList x:Key="person">  

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            <local:Person Name="Jack" Age="30"></local:Person>  

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            <local:Person Name="Tom" Age="32"></local:Person>  

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        </local:PersonList>  

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    </Window.Resources>  

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    <StackPanel x:Name="stackPanel" DataContext="{StaticResource person}">  

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        <ListBox  ItemsSource="{Binding}" 

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                   DisplayMemberPath="Name">             

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        </ListBox>  

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    </StackPanel>

8. 使用XML作为Binding的源

XML:

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<?xml version="1.0" encoding="utf-8" ?>  

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<PersonList>  

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  <Person Id="1">  

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    <Name>Jack</Name>  

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  </Person>  

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  <Person Id="2">  

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    <Name>Tom</Name>  

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  </Person>  

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  <Person Id="3">  

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    <Name>Justin</Name>  

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  </Person>  

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  <Person Id="4">  

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    <Name>David</Name>  

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  </Person>  

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</PersonList>

XAML:

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<StackPanel>  

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       <ListView x:Name="personListView">  

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           <ListView.View>  

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               <GridView>  

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                   <GridViewColumn Header="Id" Width="100" 

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                                    DisplayMemberBinding="{Binding XPath=@Id}"/>  

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                   <GridViewColumn Header="Name" Width="100" 

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                                    DisplayMemberBinding="{Binding XPath=Name}"/>  

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               </GridView>  

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           </ListView.View>  

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       </ListView>     

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       <Button Click="Button_Click">Load Data</Button>  

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   </StackPanel>

后台代码:

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private void Button_Click(object sender, RoutedEventArgs e)  

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        {  

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            XmlDocument xmlDocument = new XmlDocument();  

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            xmlDocument.Load("Person.xml"); 

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            XmlDataProvider xdp = new XmlDataProvider();  

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            xdp.Document = xmlDocument;  

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            xdp.XPath = @"/PersonList/Person"; 

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            this.personListView.DataContext = xdp;  

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            this.personListView.SetBinding(ListView.ItemsSourceProperty, new Binding());  

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        }