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WPF-Binding的源

Posted on 2011-05-06 22:57  linFen  阅读(3831)  评论(0)    收藏  举报

1. 绑定到其它元素

view sourceprint?
1 <Grid>
2     <StackPanel>
3         <TextBox x:Name="textbox1" />
4         <Label Content="{Binding ElementName=textbox1, Path=Text}" />
5     </StackPanel>
6 </Grid>
 

2. 绑定到静态资源

view sourceprint?
1 <Window.Resources>
2         <ContentControl x:Key="text">Hello, World!</ContentControl>
3 </Window.Resources>
4 <Grid>
5     <StackPanel>
6         <Label x:Name="label1" Content="{Binding Source={StaticResource text}}" />
7     </StackPanel>
8 </Grid>
9 <STRONG>3. 绑定到自身</STRONG>
view sourceprint?
1 <Grid>
2     <StackPanel>
3         <Label x:Name="label1" Content="{Binding RelativeSource={RelativeSource Self}, Path=Name}" />
4     </StackPanel>
5 </Grid>

4. 绑定到指定类型的父元素

view sourceprint?
1 <Grid x:Name="Grid1">
2         <StackPanel>
3             <Label x:Name="label1" Content="{Binding RelativeSource={RelativeSource FindAncestor, 
4                 AncestorType={x:Type Grid}}, Path=Name}" />
5         </StackPanel>
6 </Grid>

 

5. 绑定到对象

view sourceprint?
1 public class Person 
2    { 
3        public string Name { get; set; } 
4        public int Age { get; set; } 
5    }
view sourceprint?
1 <StackPanel x:Name="stackPanel"> 
2         <StackPanel.DataContext> 
3             <local:Person Name="Jack" Age="30"></local:Person> 
4         </StackPanel.DataContext> 
5         <TextBlock  Text="{Binding Path=Name}"></TextBlock> 
6         <TextBlock Text="{Binding Path=Age}"></TextBlock>        
7   
8 </StackPanel>

6. 绑定到集合

view sourceprint?
1 public class Person 
2     { 
3         public string Name { get; set; } 
4         public int Age { get; set; } 
5     }
6   
7     public class PersonList : ObservableCollection<Person> 
8     { }
view sourceprint?
01 <Window.Resources> 
02        <local:PersonList x:Key="person"> 
03            <local:Person Name="Jack" Age="30"></local:Person> 
04            <local:Person Name="Tom" Age="32"></local:Person> 
05        </local:PersonList> 
06    </Window.Resources> 
07    <StackPanel x:Name="stackPanel"> 
08        <ListBox  ItemsSource="{Binding Source={StaticResource ResourceKey=person}}" 
09                   DisplayMemberPath="Name">            
10        </ListBox> 
11 </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。

view sourceprint?
01 <Window.Resources> 
02         <local:PersonList x:Key="person"> 
03             <local:Person Name="Jack" Age="30"></local:Person> 
04             <local:Person Name="Tom" Age="32"></local:Person> 
05         </local:PersonList> 
06     </Window.Resources> 
07     <StackPanel x:Name="stackPanel" DataContext="{StaticResource person}"> 
08         <ListBox  ItemsSource="{Binding}" 
09                    DisplayMemberPath="Name">            
10         </ListBox> 
11     </StackPanel>

 

8. 使用XML作为Binding的源

XML:

view sourceprint?
01 <?xml version="1.0" encoding="utf-8" ?> 
02 <PersonList> 
03   <Person Id="1"> 
04     <Name>Jack</Name> 
05   </Person> 
06   <Person Id="2"> 
07     <Name>Tom</Name> 
08   </Person> 
09   <Person Id="3"> 
10     <Name>Justin</Name> 
11   </Person> 
12   <Person Id="4"> 
13     <Name>David</Name> 
14   </Person> 
15 </PersonList>

XAML:

view sourceprint?
01 <StackPanel> 
02        <ListView x:Name="personListView"> 
03            <ListView.View> 
04                <GridView> 
05                    <GridViewColumn Header="Id" Width="100" 
06                                     DisplayMemberBinding="{Binding XPath=@Id}"/> 
07                    <GridViewColumn Header="Name" Width="100" 
08                                     DisplayMemberBinding="{Binding XPath=Name}"/> 
09                </GridView> 
10            </ListView.View> 
11        </ListView>    
12        <Button Click="Button_Click">Load Data</Button> 
13    </StackPanel>

后台代码:

view sourceprint?
01 private void Button_Click(object sender, RoutedEventArgs e) 
02         { 
03             XmlDocument xmlDocument = new XmlDocument(); 
04             xmlDocument.Load("Person.xml");
05   
06             XmlDataProvider xdp = new XmlDataProvider(); 
07             xdp.Document = xmlDocument; 
08             xdp.XPath = @"/PersonList/Person";
09   
10             this.personListView.DataContext = xdp; 
11             this.personListView.SetBinding(ListView.ItemsSourceProperty, new Binding()); 
12         }
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