WPF Silverlight Visibility 属性的绑定

Silverlight 控件的Visibility属性不能直接用true或者false绑定，而是要通过一个Converter来实现：

 

VisibilityConverter类代码：

[c-sharp] view plain copy

1. using System;  
2. using System.Windows;  
3. using System.Windows.Data;  
4.   
5. namespace DMS.Controls  
6. {  
7.     public class VisibilityConverter:IValueConverter  
8.     {  
9.         public VisibilityConverter()  
10.         {  
11.         }  
12.         public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)  
13.         {  
14.             if (value == null)  
15.                 return Visibility.Collapsed;  
16.   
17.             bool s = (bool)value;  
18.   
19.             return (s != true) ? Visibility.Collapsed : Visibility.Visible;  
20.         }  
21.   
22.         public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)  
23.         {  
24.             throw new NotImplementedException();  
25.         }  
26.   
27.     }  
28. }  

 

在XAML里引用这个类：

[c-sharp] view plain copy

1.  <sdk:DataGrid AutoGenerateColumns="False" Height="284" HorizontalAlignment="Left" Margin="5,63,0,0" Name="OrderList" VerticalAlignment="Top" Width="798" ItemsSource="{Binding}">  
2.                                                         <sdk:DataGrid.Resources >  
3.                                                             <local:VisibilityConverter x:Key="iconverter"/>  
4.                                                         </sdk:DataGrid.Resources>  
5.                                                         <sdk:DataGrid.Columns >  
6.                                                             <sdk:DataGridTemplateColumn Header="按钮是否可见示范绑定" Width="Auto">  
7.                                                                 <sdk:DataGridTemplateColumn.CellTemplate>  
8.                                                                     <DataTemplate>  
9.                                                                         <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">  
10.                                                                             <TextBlock Width="Auto" Text="订单类别:"/>  
11.                                                                             <Button x:Name="XSJX_Confirm" Content="确认订单" Visibility="{Binding Path=XSJL_VISABLE,Converter={StaticResource iconverter}}"/>  
12.                                                                         </StackPanel>  
13.                                                                     </DataTemplate>  
14.                                                                 </sdk:DataGridTemplateColumn.CellTemplate>  
15.                                                             </sdk:DataGridTemplateColumn>  
16. </sdk:DataGrid.Columns>  
17. </sdk:DataGrid>  
18.                                                              

 

其中： XSZJ_VISABLE 是bool 类型，= true 按钮可见；=false 按钮不可见，通过VisibilityConverter转成

Visibility.Collapsed 或 Visibility.Visible。