Question

我通过删除现有列并根据给定表添加新列来动态生成GridView。它显示了数据，但我在即时窗口中收到了大量错误。

System.Windows.Data错误：39：BindingExpression路径错误：＆＃39; MainPartnerName＆＃39;在＆＃39; object＆＃39;上找不到的属性＆＃39;＆＃39; DataRowView的＆＃39; （的HashCode = 39346072）＆＃39 ;. BindingExpression：路径= MainPartnerName;的DataItem =＆＃39; DataRowView的＆＃39; （的HashCode = 39346072）;目标元素是＆＃39; TextBlock＆＃39; （名称=＆＃39;＆＃39）;目标属性是＆＃39; Text＆＃39; （键入＆＃39; String＆＃39;）

Private Sub SetupGridView(ByVal objTable As Object)
    'remove existing columns
    Dim gv As GridView = lvClientsView.View
    For x As Integer = gv.Columns.Count - 1 To 0 Step -1
        gv.Columns.RemoveAt(x)
    Next

    'add new column for each column in table
    For Each col As DataColumn In objTable.Columns
        Dim gvCol As GridViewColumn = Nothing
        gvCol = New GridViewColumn
        gvCol.Header = col.ColumnName
        gvCol.DisplayMemberBinding = New Binding(col.ColumnName)
        gv.Columns.Add(gvCol)
    Next

    Dim bnd As New Binding
    bnd.Source = objTable
    lvClientsView.SetBinding(ListView.ItemsSourceProperty, bnd)

End Sub

我的XAML很简单：

<ListView Name="lvClientsView" DockPanel.Dock="Top"  >
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <EventSetter Event="PreviewMouseLeftButtonDown" Handler="lvClientsViewItem_PreviewMouseLeftButtonUp"  />
        </Style>
    </ListView.ItemContainerStyle>
    <ListView.View>
        <GridView>
        </GridView>
    </ListView.View>
</ListView>

我动态拆解并重建视图。如何删除表和绑定，以便我可以分配不同的表和绑定？

Answer 1

最后我发现我需要做四件事：

设置新的空白绑定，无数据
删除现有的GridView并替换为新的
为每个新表定义添加新列

设置绑定到新表

Private Sub SetupGridView(ByVal objTable As Object)

    'set binding to new blank binding with no data
    lvClientsView.SetBinding(ListView.ItemsSourceProperty, New Binding)

    'remove existing gridview and replace with new one
    lvClientsView.View = Nothing
    Dim gv As New GridView
    lvClientsView.View = gv

    'add new column for each column in table
    For Each col As DataColumn In objTable.Columns
        Dim gvCol As GridViewColumn = Nothing
        gvCol = New GridViewColumn
        gvCol.Header = col.ColumnName
        gvCol.DisplayMemberBinding = New Binding(col.ColumnName)
        gv.Columns.Add(gvCol)
    Next

    'set new binding to objTable
    Dim bnd As Binding = New Binding
    bnd.Source = objTable
    lvClientsView.SetBinding(ListView.ItemsSourceProperty, bnd)

End Sub

工作得很漂亮！

如何动态更改ListView绑定上的表

1 个答案: