Question

有2个XAML，为什么第二个工作，第一个不工作？

CS：

public partial class myClass: Window
{
  public static DependencyProperty RoutersPortsViewProperty = DependencyProperty.Register("RoutersPortsView", typeof(DataView), typeof(myClass));

  public myClass()
  {
    DataTable MyTable = new DataTable();
    /*here fill MyTable*/
    SetValue(RoutersPortsViewProperty, new DataView(MyTable);
    InitializeComponent();
  }

  /*there other code for class*/
}

XAML不起作用：

<Window Name="myName" x:Class="myClass">
  <DataGrid>
    <DataGrid.Columns>
      <DataGridComboBoxColumn DisplayMemberPath="DisplayString" 
                              SelectedValuePath="id" 
                              SelectedValueBinding="{Binding Path=NWPatchPanelID, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True}" 
                              ItemsSource="{Binding Path=RoutersPortsView, ElementName=myName}"/>
    </DataGrid.Columns>
  </DataGrid>
</Window>

错误：

System.Windows.Data错误：2：找不到目标元素的管理FrameworkElement或FrameworkContentElement。 BindingExpression：路径= RoutersPortsView;的DataItem = NULL;目标要素是'DataGridComboBoxColumn'（HashCode = 11022751）;目标属性是 'ItemsSource'（输入'IEnumerable'）

XAML工作：

<Window Name="myName" x:Class="myClass">
  <DataGrid>
    <DataGrid.Columns>
      <DataGridComboBoxColumn DisplayMemberPath="DisplayString" 
                              SelectedValuePath="id" 
                              SelectedValueBinding="{Binding Path=NWPatchPanelID, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True}">
        <DataGridComboBoxColumn.EditingElementStyle>
          <Style TargetType="ComboBox">
            <Setter Property="ItemsSource" Value="{Binding Path=RoutersPortsView, ElementName=myName}"/>
          </Style>
        </DataGridComboBoxColumn.EditingElementStyle>
      </DataGridComboBoxColumn>
    </DataGrid.Columns>
  </DataGrid>
</Window>

Answer 1

以下列形式公开您的DP：

public DataView RoutersPortsView
        {
            get { return (DataView )GetValue(RoutersPortsViewProperty ); }
            set { SetValue(RoutersPortsViewProperty , value); }
        }

DataGridComboBoxColumn.ItemsSource。绑定与EditingElementStyle

1 个答案: