Question

我需要将dataGrid中的ComboBox绑定到List<string>

列表如下：

public static ObservableCollection<string> m_Category = 
    new ObservableCollection<string>()  { "Simulation", "Materials" };

这是我的comboBox定义：

<DataGridTemplateColumn.CellEditingTemplate>
    <DataTemplate>
        <Grid FocusManager.FocusedElement="{Binding ElementName= taskCombo}" >
            <ComboBox x:Name="MyComboBox" Height="Auto" Width="Auto"  
            ItemsSource="{Binding m_Category ,
                         NotifyOnTargetUpdated=True,
                         Mode=TwoWay,
                         UpdateSourceTrigger=PropertyChanged}" 
            SelectedIndex ="0"  
            SelectionChanged ="MyComboBox_SelectionChanged"/>
        </Grid>
    </DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>

我在组合框中没有得到任何值

Answer 1

试试这个

 <ComboBox ItemsSource="{Binding Source={x:Static Member=local:MyWindow.M_Category}}"/>

 public partial class MyWindow : MyBaseWindow
{
    public static ObservableCollection<string> m_Category = new ObservableCollection<string>() { "Simulation", "Materials" };
    public static ObservableCollection<string> M_Category
    {
        get { return m_Category; }
    }
    ......

我希望这会让你了解如何绑定静态属性

Answer 2

ObservableCollection是静态的，因此您必须使用另一种语法：

ItemsSource="{Binding Source={x:Static YourClass.m_Category} ,
                     NotifyOnTargetUpdated=True,
                     Mode=TwoWay,
                     UpdateSourceTrigger=PropertyChanged}"

但是：这也行不通。您只能绑定到属性，而不能绑定到字段。所以你必须创建一个属性，我不会将其定义为静态。像以下一样更改您的VM：

public static ObservableCollection<string> m_Category = new ObservableCollection<string>()  { "Simulation", "Materials" };
public ObservableCollection<string> Category
{
  get { return m_Category; }
}

并将您的ComboBox绑定到此属性：

<DataGridTemplateColumn.CellEditingTemplate>
  <DataTemplate>
    <Grid FocusManager.FocusedElement="{Binding ElementName= taskCombo}" >
        <ComboBox x:Name="MyComboBox" Height="Auto" Width="Auto"  
        ItemsSource="{Binding Category}" 
        SelectedIndex ="0"  
        SelectionChanged ="MyComboBox_SelectionChanged"/>
    </Grid>
  </DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>

当然这只有在你设置了正确的DataContext时才有效，你可以用一些像snoop

这样的wpf间谍来观看

将DataGrid中的ComboBox绑定到List <string> </string>

2 个答案: