c# - 如何更改 gridview 中组合框的可见性

Question

我想更改组合框在 GridView 中的可见性。当值为空或 null 时，需要隐藏组合框。到目前为止，这是我的代码。 gvCursisten 是 GridView 。

编辑:这在 xaml 中有效，但在 cs 中无效。

  <ListView Grid.Row="4" Grid.Column="0" Grid.ColumnSpan="2" Grid.RowSpan="2" Name="lvTest">
                <ListView.View>
                    <GridView x:Name="gvCursisten">
                        <GridViewColumn Header="Property" Width="160">
                            <GridViewColumn.CellTemplate>
                                <DataTemplate>
                                    <ComboBox x:Name="PropertyComboBox" ItemsSource="{Binding Path=Voornaam}" Width="140" >
                                        <ComboBox.Style>
                                            <Style TargetType="ComboBox">
                                                <Setter Property="Visibility" Value="Visible"/>
                                                <Style.Triggers>
                                                    <DataTrigger Binding="{Binding ElementName=txtTest, Path=Text}" Value="Hoi">
                                                        <Setter Property="Visibility" Value="Hidden"/>
                                                    </DataTrigger>
                                                </Style.Triggers>
                                            </Style>
                                        </ComboBox.Style>
                                    </ComboBox>
                                </DataTemplate>
                            </GridViewColumn.CellTemplate>
                        </GridViewColumn>
                    </GridView>
                </ListView.View>
            </ListView>

C# code
GridViewColumn gvcCombobox2 = new GridViewColumn();
gvcCombobox2.Header = "Combobox2";
gvcCombobox2.Width = 200;

DataTemplate dteCombobox2 = new DataTemplate();

Style styleComboBox2 = new Style(typeof(ComboBox));
Setter setterStyleComboBox2 = new Setter();
setterStyleComboBox2.Property = ComboBox.VisibilityProperty;
setterStyleComboBox2.Value = Visibility.Visible;
styleComboBox2.Setters.Add(setterStyleComboBox2);

DataTrigger datatriggerStyleComboBox2 = new DataTrigger();
datatriggerStyleComboBox2.Value = "Hello";
Binding bindingDatatriggerStyleComboBox2 = new Binding("{Binding ControlType}");
datatriggerStyleComboBox2.Binding = bindingDatatriggerStyleComboBox2;

Setter setterDatatriggerStyleComboBox2 = new Setter();
setterDatatriggerStyleComboBox2.Property = ComboBox.VisibilityProperty;
setterDatatriggerStyleComboBox2.Value = Visibility.Hidden;
datatriggerStyleComboBox2.Setters.Add(setterDatatriggerStyleComboBox2);

styleComboBox2.Triggers.Add(datatriggerStyleComboBox2);

FrameworkElementFactory fefCombobox2 = new FrameworkElementFactory(typeof(ComboBox));
fefCombobox2.SetValue(ComboBox.WidthProperty, 140D);
fefCombobox2.SetValue(ComboBox.ItemsSourceProperty, dtTest.DefaultView);
fefCombobox2.SetValue(ComboBox.StyleProperty, styleComboBox2);

dteCombobox2.VisualTree = fefCombobox2;
gvcCombobox2.CellTemplate = dteCombobox2;
gvCursisten.Columns.Add(gvcCombobox2);

Answer 1

尝试这样的事情。您可以遍历 gridview 的每一行并绑定(bind)数据或使用 FindControl 设置 gridview 中控件的可见性。

protected void gvCursisten_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
        ComboBox cb = (e.Row.FindControl("gvcomboboxid") as ComboBox);
        if(some_value == null)
        {
            cb.Visible = false;
        }
        else
        {
            cb.Visible = true;
        }
    }
}