使按鈕在DataGrid中可見

Question

我已經在WPF中創建了一個Datagrid控件。我怎樣才能使按鈕可見只爲

行，我已選擇它，以便我的按鈕將顯示在按鈕列單元格。

XAML: 
<DataGridTemplateColumn x:Name="Button-Column" Header="H." Width="50"> 
    <DataGridTemplateColumn.CellTemplate> 
    <DataTemplate> 
     <DataTemplate.Triggers> 
     <DataTrigger Binding="{Binding Path=ObjectType}" Value="E"> 
      <Setter Property="Visibility" Value="Hidden" /> 
     </DataTrigger> 
     <DataTrigger Binding="{Binding Path=ObjectType}" Value="F"> 
      <Setter Property="Visibility" Value="Hidden" /> 
     </DataTrigger> 
     <DataTrigger Binding="{Binding Path=ObjectType}" Value= "P"> 
      <Setter Property="Visibility" Value="Hidden" /> 
     </DataTrigger> 
     </DataTemplate.Triggers>    
     <Button Name="btnTable" Visibility="{Binding Path=ObjectType}" Height="20" 
       Width="25" Click="Button_Table_Click"> 
     </Button> 
    </DataTemplate> 
    </DataGridTemplateColumn.CellTemplate> 
    </DataGridTemplateColumn> 

Answer 1

這裏是一個溶液中使用multibinding：

XAML：

<Window x:Class="WpfApplication8.MainWindow" 
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:WpfApplication8="clr-namespace:WpfApplication8" 
      Title="MainWindow" Height="350" Width="525"> 
     <Window.Resources> 
      <WpfApplication8:ButtonVisibilityConverter x:Key="buttonVisibilityConverter"/> 
     </Window.Resources> 
     <DataGrid x:Name="dataGrid" SelectedItem="{Binding MySelectedItem}" ItemsSource="{Binding MyObjectList}" SelectionMode="Single"> 
      <DataGrid.Columns> 
       <DataGridTemplateColumn Header="H." Width="50"> 
        <DataGridTemplateColumn.CellTemplate> 
         <DataTemplate> 
          <Button 
            Height="20" 
            Width="25"> 
           <Button.Visibility> 
            <MultiBinding Converter="{StaticResource buttonVisibilityConverter}"> 
             <Binding Path="Parent.MySelectedItem"/> 
             <Binding></Binding> 
            </MultiBinding> 
           </Button.Visibility> 
          </Button> 
         </DataTemplate> 
        </DataGridTemplateColumn.CellTemplate> 
       </DataGridTemplateColumn> 
      </DataGrid.Columns> 
     </DataGrid> 
    </Window> 

代碼後面：

namespace WpfApplication8 
{ 
    /// <summary> 
    /// Interaction logic for MainWindow.xaml 
    /// </summary> 
    public partial class MainWindow : Window, INotifyPropertyChanged 
    { 
     #region INotifyPropertyChanged Members 

     public event PropertyChangedEventHandler PropertyChanged; 

     #endregion 

     public class Toto 
     { 
      public object Parent { get; set; } 

      public string Name { get; set; } 
      public string Content { get; set; } 

      public Toto(string name, string content, object parent) 
      { 
       this.Name = name; this.Content = content; this.Parent = parent; 
      } 
     } 

     private object _mySelectedItem; 

     public object MySelectedItem 
     { 
      get { return _mySelectedItem; } 
      set 
      { 
       _mySelectedItem = value; 
       if (this.PropertyChanged != null) 
       { 
        this.PropertyChanged(this, new PropertyChangedEventArgs("MySelectedItem")); 
       } 
      } 
     } 

     private List<Toto> _myObjectList; 

     public List<Toto> MyObjectList 
     { 
      get { return _myObjectList; } 
      set { _myObjectList = value; } 
     } 

     public MainWindow() 
     { 
      this.MyObjectList = new List<Toto> 
      { 
       new Toto("toto1", "content toto1", this), 
       new Toto("toto2", "content toto2", this) 
      }; 

      InitializeComponent(); 

      this.DataContext = this; 
     } 
    } 
} 

轉換器：

class ButtonVisibilityConverter : IMultiValueConverter 
{ 
    #region IMultiValueConverter Members 

    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     if (values[0] == values[1]) 
     { 
      return Visibility.Visible; 
     } 
     else 
     { 
      return Visibility.Hidden; 
     } 
    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 

    #endregion 
}