问题
I have the following object in App.xaml
<Application.Resources>
<ResourceDictionary>
<GridView x:Key="myGridView" x:Shared="false">
<GridViewColumn Header="Created" DisplayMemberBinding="{Binding Path=Created}"/>
... more code ...
And I use this grid view in multiple places. Example:
<ListView x:Name="detailList" View="{StaticResource myGridView}" ...>
In one of the usages (such as detailList above), I'd like to hide the Created column, possibly using XAML?
Any ideas?
回答1:
Actually, I find the easiest solution is via attached properties:
public class GridViewColumnVisibilityManager
{
static void UpdateListView(ListView lv)
{
GridView gridview = lv.View as GridView;
if (gridview == null || gridview.Columns == null) return;
List<GridViewColumn> toRemove = new List<GridViewColumn>();
foreach (GridViewColumn gc in gridview.Columns)
{
if (GetIsVisible(gc) == false)
{
toRemove.Add(gc);
}
}
foreach (GridViewColumn gc in toRemove)
{
gridview.Columns.Remove(gc);
}
}
public static bool GetIsVisible(DependencyObject obj)
{
return (bool)obj.GetValue(IsVisibleProperty);
}
public static void SetIsVisible(DependencyObject obj, bool value)
{
obj.SetValue(IsVisibleProperty, value);
}
public static readonly DependencyProperty IsVisibleProperty =
DependencyProperty.RegisterAttached("IsVisible", typeof(bool), typeof(GridViewColumnVisibilityManager), new UIPropertyMetadata(true));
public static bool GetEnabled(DependencyObject obj)
{
return (bool)obj.GetValue(EnabledProperty);
}
public static void SetEnabled(DependencyObject obj, bool value)
{
obj.SetValue(EnabledProperty, value);
}
public static readonly DependencyProperty EnabledProperty =
DependencyProperty.RegisterAttached("Enabled", typeof(bool), typeof(GridViewColumnVisibilityManager), new UIPropertyMetadata(false,
new PropertyChangedCallback(OnEnabledChanged)));
private static void OnEnabledChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
ListView view = obj as ListView;
if (view != null)
{
bool enabled = (bool)e.NewValue;
if (enabled)
{
view.Loaded += (sender, e2) =>
{
UpdateListView((ListView)sender);
};
view.TargetUpdated += (sender, e2) =>
{
UpdateListView((ListView)sender);
};
view.DataContextChanged += (sender, e2) =>
{
UpdateListView((ListView)sender);
};
}
}
}
}
Then, it can be used as so:
<ListView foo:GridViewColumnVisibilityManager.Enabled="True">
...
<GridViewColumn Header="Status" foo:GridViewColumnVisibilityManager.IsVisible="{Binding ShowStatusColumn}">
<GridViewColumn.CellTemplate>
<DataTemplate> ...
回答2:
Based on Ben McMillan's answer, but supports dynamic changing of visible property. I've simplified his solution further by removing the IsEnabled property.
public class GridViewColumnVisibilityManager
{
static Dictionary<GridViewColumn, double> originalColumnWidths = new Dictionary<GridViewColumn, double>();
public static bool GetIsVisible(DependencyObject obj)
{
return (bool)obj.GetValue(IsVisibleProperty);
}
public static void SetIsVisible(DependencyObject obj, bool value)
{
obj.SetValue(IsVisibleProperty, value);
}
public static readonly DependencyProperty IsVisibleProperty =
DependencyProperty.RegisterAttached("IsVisible", typeof(bool), typeof(GridViewColumnVisibilityManager), new UIPropertyMetadata(true, OnIsVisibleChanged));
private static void OnIsVisibleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
GridViewColumn gc = d as GridViewColumn;
if (gc == null)
return;
if (GetIsVisible(gc) == false)
{
originalColumnWidths[gc] = gc.Width;
gc.Width = 0;
}
else
{
if (gc.Width == 0)
gc.Width = originalColumnWidths[gc];
}
}
}
回答3:
You best bet is probably to create a custom control by inheriting from the GridView class, adding the required columns, and exposing a meaningful property to show/hide a particular column. Your custom GridView class could look like this:
using System;
using System.Windows.Controls;
namespace MyProject.CustomControls
{
public class CustomGridView : GridView
{
private GridViewColumn _fixedColumn;
private GridViewColumn _optionalColumn;
public CustomGridView()
{
this._fixedColumn = new GridViewColumn() { Header = "Fixed Column" };
this._optionalColumn = new GridViewColumn() { Header = "Optional Column" };
this.Columns.Add(_fixedColumn);
this.Columns.Add(_optionalColumn);
}
public bool ShowOptionalColumn
{
get { return _optionalColumn.Width > 0; }
set
{
// When 'False' hides the entire column
// otherwise its width will be set to 'Auto'
_optionalColumn.Width = (!value) ? 0 : Double.NaN;
}
}
}
}
Then you can simply set that property from XAML like in this example:
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:cc="clr-namespace:MyProject.CustomControls"
Title="Window1"
Height="300"
Width="300">
<StackPanel>
<ListView>
<ListView.View>
<cc:CustomGridView ShowOptionalColumn="False" />
</ListView.View>
</ListView>
<ListView>
<ListView.View>
<cc:CustomGridView ShowOptionalColumn="True" />
</ListView.View>
</ListView>
</StackPanel>
</Window>
Optionally, you could make the 'CustomGridView.ShowOptionalColumn' a DependencyProperty to be able to use it as a binding target.
回答4:
Taken from here
<ListView Grid.Column="1" Grid.Row="1" Name="FicheList" >
<ListView.Resources>
<ResourceDictionary>
<Style x:Key="hiddenStyle" TargetType="GridViewColumnHeader">
<Setter Property="Visibility" Value="Collapsed"/>
</Style>
</ResourceDictionary>
</ListView.Resources>
<ListView.View>
<GridView>
<GridViewColumn DisplayMemberBinding="{Binding Code}" Header="Code" Width="0" HeaderContainerStyle="{StaticResource hiddenStyle}" />
<GridViewColumn DisplayMemberBinding="{Binding FicheTitle}" Header="Title" Width="100" />
<GridViewColumn DisplayMemberBinding="{Binding CategoryName}" Header="Category" Width="100" />
<GridViewColumn DisplayMemberBinding="{Binding UpdateDate}" Header="Update Date" Width="100" />
</GridView>
</ListView.View>
</ListView>
回答5:
This is my code , it works very well in my project. if you don't like to add some external code.
/// <summary>
/// show/hide datagrid column
/// </summary>
/// <param name="datagrid"></param>
/// <param name="header"></param>
private void ToggleDataGridColumnsVisible()
{
if (IsNeedToShowHideColumn())
{
foreach (GridViewColumn column in ((GridView)(this.ListView1.View)).Columns)
{
GridViewColumnHeader header = column.Header as GridViewColumnHeader;
if (header != null)
{
string headerstring = header.Tag.ToString();
if (!IsAllWaysShowingHeader(headerstring ) )
{
if (IsShowingHeader())
{
}
else
{
//hide it
header.Template = null;
column.CellTemplate = null;
column.Width = 0;
}
}
}
}
}
}
回答6:
I have a much simpler solution than using an Attached Behavior.
All you have to do is bind the Width Property of the GridViewColumn to a boolean on your ViewModel. Then create a simple Converter like BooleanToWidthConverter that takes a boolean and returns a double, zero if its false, x width if its true.
I hope this helps and makes your life easier.
XAML:
<GridViewColumn x:Name="MyHiddenGridViewColumn"
Width={Binding Path=IsColumnVisibleProperty, Converter={StaticResource BooleanToWidthConverter}}">
<!-- GridViewColumn.HeaderTemplate etc. goes here. -->
</GridViewColumn>
Converter:
public class BooleanToWidthConverter : IValueConverter
{
private const double Column_Width = 40.0;
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value != null && value != DependencyProperty.UnsetValue)
{
bool isVisible = (bool) value;
return isVisible ? Column_Width : 0;
}
return Column_Width;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
回答7:
I'd suggest using a custom property (or hijacking an existing one) on the parent and then using a custom style on the gridviewcolumnheader to reference that ancestor property. Like this:
<Window.Resources>
<Style TargetType="{x:Type GridViewColumnHeader}">
<Setter Property="Visibility" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListView}}, Path=Tag}"/>
</Style>
<GridView x:Key="myGridView" x:Shared="false">
<GridViewColumn Header="Created" DisplayMemberBinding="{Binding Path=Created}"/>
</GridView>
</Window.Resources>
<Grid x:Name="LayoutRoot">
<StackPanel>
<ListView x:Name="detailList" View="{StaticResource myGridView}"/>
<ListView x:Name="detailListHide" Tag="{x:Static Member=Visibility.Hidden}" View="{StaticResource myGridView}"/>
</StackPanel>
</Grid>
回答8:
In a small utility I wrote, I have a list view where the user can hide/show some columns. There is no Visibility property on the columns, so I decided to set the hidden columns width to zero. Not ideal, as the user can still resize them and make them visible again.
Anyway, to do this, I used:
<GridViewColumn.Width>
<MultiBinding Converter="{StaticResource WidthConverter}" Mode="TwoWay">
<Binding Path="ThreadIdColumnWidth" Mode="TwoWay" />
<Binding Path="IsThreadIdShown" />
</MultiBinding>
</GridViewColumn.Width>
IsThreadIdShown is bound to a check box on the toolbar.
And the multi-value converter is:
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) {
if (values.Length != 2) {
return null;
}
object o0 = values[0];
object o1 = values[1];
if (! (o1 is bool)) {
return o0;
}
bool toBeDisplayed = (bool) o1;
if (! toBeDisplayed) {
return 0.0;
}
if (! (o0 is double)) {
return 0;
}
return (double) o0;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) {
return new object[] { (double)value, Binding.DoNothing };
}
回答9:
This works for me
Need to bind the Visibility on both the header and the content
In this case it is at the end so I don't worry about the Width
BUT the user does not get a UI hook to reset the width so if you set the width to zero it is gone
<GridViewColumn Width="60">
<GridViewColumnHeader HorizontalContentAlignment="Stretch" HorizontalAlignment="Stretch"
Visibility="{Binding Source={x:Static Application.Current}, Path=MyGabeLib.CurUser.IsInRoleSysAdmin, Converter={StaticResource bvc}}">
<TextBlock>WS<LineBreak/>Count</TextBlock>
</GridViewColumnHeader>
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=WordScoreCount, StringFormat={}{0:N0}}" HorizontalAlignment="Right"
Visibility="{Binding Source={x:Static Application.Current}, Path=MyGabeLib.CurUser.IsInRoleSysAdmin, Converter={StaticResource bvc}}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
回答10:
<GridViewColumn Width="{Binding Tag, RelativeSource={RelativeSource AncestorType=ListView}, Converter={converters:BooleanToWidthConverter}, ConverterParameter=100}">
<GridViewColumn.HeaderContainerStyle>
<Style TargetType="{x:Type GridViewColumnHeader}" BasedOn="{StaticResource ColumnHeaderStyle}">
<Setter Property="IsEnabled" Value="False"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Tag, RelativeSource={RelativeSource AncestorType=ListView}}" Value="true">
<Setter Property="IsEnabled" Value="True"/>
</DataTrigger>
</Style.Triggers>
</Style>
</GridViewColumn.HeaderContainerStyle>
<GridViewColumn.Header>
<StackPanel Tag="columnHeader" Orientation="Horizontal">
</StackPanel>
</GridViewColumn.Header>
<GridViewColumn.CellTemplate>
<DataTemplate>
<ContentControl>
<TextBlock Text="test" />
</ContentControl>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
class BooleanToWidthConverter :IValueConverter {
public object Convert (object value, Type targetType, object parameter, CultureInfo culture)
{
if (value is bool b)
{
return b ? parameter : 0;
}
return 0;
}
public object ConvertBack (object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}
}
Unfortunately, there is no "IsVisible" Property in GridViewColumn But, I have a solution can solve this problem by simple and complete way:
- Setting width to 0. Many Dev just stop at this step, because it seems to have been hidden but not. We still make it extendible hence bringing it back on the UI by resize column, so we need to do more step 2.
- Disable resize GridViewColumn by set GridViewColumnHeader IsEnabled = false.
Code sample above:
来源：https://stackoverflow.com/questions/729866/wpf-how-to-hide-gridviewcolumn-using-xaml