Question

我正在尝试使用允许用户显示/隐藏列的控件来构建DataGrid。我的DataGrid将有40个列，并不是所有的都可能是必需的。我已经能够使用一个使用GridView的ListView做这件事。这是代码：

<DataGrid Name="MyDataGrid" Grid.Row="2" Grid.Column="0" ItemsSource="{Binding ReportOrderingCustomersForSalesRepCollection}" Style="{DynamicResource styleDataGrid}" HeadersVisibility="All" AutoGenerateColumns="False" RowHeaderWidth="0" RowHeight="25">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Customer #" Binding="{Binding CustomerNumber}" Width="90" Visibility="{Binding ElementName=Visibility_Txt,Path=Text,Mode=OneWay}"/>
        <DataGridTextColumn Header="Customer Name" Binding="{Binding CustomerName}" Width="125" />
        <DataGridTemplateColumn Header="Email" CellTemplate="{StaticResource Email}" Width="150" />
    </DataGrid.Columns>
</DataGrid>
<!-- text box -->
<TextBox Name="Visiblility_Txt">
    <TextBox.Style>
        <Style TargetType="TextBox">
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=ColumnVisibilityCheck,Path=IsChecked}" Value="False">
                    <Setter Property="Text" Value="Collapsed" />
                </DataTrigger>
                <DataTrigger Binding="{Binding ElementName=ColumnVisibilityCheck,Path=IsChecked}" Value="True">
                    <Setter Property="Text" Value="Visible" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBox.Style>
</TextBox>
<!-- checkbox -->
<CheckBox Content="Show/Hide Customer Number" Name="ColumnVisibilityCheck" IsChecked="True" />

所以我有一个DataGrid设置。第一个DataGridTextColumn上的Visibility属性设置为对“Visibility_Txt”的text属性的绑定。根据是否选中ColumnVisibilityCheck，该文本框上的文本将设置为折叠或可见。

就像我说的，这适用于listview，为什么这不适用于DataGrid？

Answer 1

能够找到更多相关信息。这个链接有一个很好的答案/解释。 datagridtextcolumn-visibility-binding

事实证明，DataGrid的列不会出现在DataGrid的可视树中。

但答案是在可见性绑定中使用x：reference，以及BooleanToVisibilityConverter：

            <DataGridTextColumn Header="Customer #" x:Name="CustNum_Col" Visibility="{Binding Source={x:Reference VisibilityCheck}, Path=IsChecked,Converter={StaticResource ObjectToVisibilityConverter}}" />

Visual Studio将显示绑定下的波浪线，表示“对象未设置为对象的实例”，但它仍然可以正常工作。

Answer 2

只需将其MaxWidth属性设置为零，它就不会出现。

DataGrid.Columns[IndexOfColumn].MaxWidth = 0;

Answer 3

1：在DataGrid中应用以下行为

<i:Interaction.Behaviors>
    <b:DataGridColumnVisibilityBindingBehavior Binding="{Binding IsNameVisible}" 
ColumnIndex="3" />
    </i:Interaction.Behaviors>

3：这是行为的实施

public class DataGridColumnVisibilityBindingBehavior : Behavior<DataGrid>
{
    private static readonly DependencyProperty ProxyProperty = DependencyProperty.RegisterAttached(
        "Proxy",
        typeof(object),
        typeof(DataGridColumnVisibilityBindingBehavior),
        new PropertyMetadata(OnGridProxyChanged));

    private static readonly DependencyProperty AssociatedBinderProperty = DependencyProperty.RegisterAttached(
        "AssociatedBinder",
        typeof(ColumnDataContextBinder),
        typeof(DataGridColumnVisibilityBindingBehavior),
        new PropertyMetadata(default(ColumnDataContextBinder)));

    public Binding Binding { get; set; }

    public int ColumnIndex { get; set; }

    protected override void OnAttached()
    {
        base.OnAttached();

        CheckProxyBound();

        var column = AssociatedObject.Columns[this.ColumnIndex];
        var columnBinder = new ColumnDataContextBinder(column, this.Binding)
            {
                DataContext = AssociatedObject.GetValue(ProxyProperty)
            };

        column.SetValue(AssociatedBinderProperty, columnBinder);
    }

    private static void OnGridProxyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var grid = (DataGrid)d;
        foreach (var column in grid.Columns)
        {
            var binder = (ColumnBinder)column.GetValue(AssociatedBinderProperty);
            if (binder != null)
            {
                binder.DataContext = e.NewValue;
            }
        }
    }

    private void CheckProxyBound()
    {
        if (AssociatedObject.GetBindingExpression(ProxyProperty) == null)
        {
            AssociatedObject.SetBinding(ProxyProperty, new Binding());
        }
    }

    private sealed class ColumnDataContextBinder : FrameworkElement
    {
        private static readonly DependencyProperty IsVisibleProperty = DependencyProperty.Register(
            "IsVisible",
            typeof(bool),
            typeof(ColumnDataContextBinder),
            new PropertyMetadata(true, (s, e) => ((ColumnDataContextBinder)s).OnVisibilityChanged()));

        private readonly DataGridColumn column;

        public ColumnDataContextBinder(DataGridColumn column, Binding binding)
        {
            column = column;

            SetBinding(IsVisibleProperty, binding);
        }

        private bool IsVisible
        {
            get { return (bool)GetValue(IsVisibleProperty); }
        }

        private void OnVisibilityChanged()
        {
            column.Visibility = IsVisible ? Visibility.Visible : Visibility.Collapsed;
        }
    }
}

3：我希望这能回答你的问题。

Answer 4

如果您正在自动生成列（或可以更改为该列），请尝试与此操作关联的事件。也可用于更改标题值。

https://docs.microsoft.com/en-us/dotnet/api/system.windows.controls.datagrid.autogeneratingcolumn?view=net-5.0

显示/隐藏DataGrid列XAML

4 个答案: