我有一个文本框和一个类似的datagrid:
<Page
TextElement.FontSize="14" FontFamily="Segoe UI"
Title="Delivery View">
<Page.Resources>
<xcdg:DataGridCollectionViewSource x:Key="firstNameDataSource"
Source="{Binding Path=Accessor.Views[FirstNameView].SourceCollection}"
AutoFilterMode="And"
DistinctValuesConstraint="Filtered">
<xcdg:DataGridCollectionViewSource.ItemProperties>
<xcdg:DataGridItemProperty Name="FirstName" CalculateDistinctValues="False"/>
</xcdg:DataGridCollectionViewSource.ItemProperties>
</xcdg:DataGridCollectionViewSource>
</Page.Resources>
<ScrollViewer Name="pendingScroll" HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible">
<DockPanel Name="pnlMainPanel" LastChildFill="True" Style="{StaticResource panelBackground}">
<Grid Margin="15">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" FontSize="18" Text="Pending Guests" Margin="0,1,3,1" Foreground="SteelBlue" HorizontalAlignment="Left"/>
<TextBox Name="txtFirstNameFilter" Grid.Row="1" >
</TextBox>
<xcdg:DataGridControl x:Name="gridPendingGuests" Margin="5,0,5,1"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
MinHeight="100"
MinWidth="200"
CellEditorDisplayConditions="None"
EditTriggers="None"
ItemScrollingBehavior="Immediate"
AutoCreateColumns="False"
SelectionMode="Single"
NavigationBehavior="RowOnly"
ItemsSource="{Binding Source={StaticResource firstNameDataSource}}">
<xcdg:DataGridControl.View>
<xcdg:TableView ShowRowSelectorPane="False"/>
</xcdg:DataGridControl.View>
<xcdg:DataGridControl.Columns>
<xcdg:Column x:Name="FirstName" FieldName="FirstName" Title="First Name" Width="150" />
</xcdg:DataGridControl.Columns>
<i:Interaction.Behaviors>
<utils:UpdateDataGridOnTextboxChange/>
</i:Interaction.Behaviors>
</xcdg:DataGridControl>
</Grid>
</DockPanel>
</ScrollViewer>
</Page>
在数据杂志中,您有一个名字的集合。这很好。显示很好。如您所见,我添加了一个Interactions.Behavior类,该类当前在用户使用鼠标命中数据杂志时,用硬编码值处理过滤器。过滤效果很好。如果有" John"的名字,则将该记录从视图中删除,并留下所有其他记录。
这是该代码:
using System.Windows.Interactivity;
using System.Windows;
using Xceed.Wpf.DataGrid;
using System;
namespace Some.Namespace.Behaviors
{
public class UpdateDataGridOnTextboxChange : Behavior<DataGridControl>
{
protected override void OnAttached()
{
AssociatedObject.MouseUp += AssociatedObjectOnMouseUp;
base.OnAttached();
}
protected override void OnDetaching()
{
AssociatedObject.MouseUp -= AssociatedObjectOnMouseUp;
base.OnDetaching();
}
private void AssociatedObjectOnMouseUp(object sender, RoutedEventArgs routedEventArgs)
{
var items = AssociatedObject.Items;
items.Filter = CollectionFilter;
}
private bool CollectionFilter(object item)
{
System.Data.DataRow dr = item as System.Data.DataRow;
//set the ItemArray as Guest
Guest guest = SetGuest(dr);
if (guest.FirstName.Equals("John"))
{
return false;
}
return true;
}
private Guest SetGuest(System.Data.DataRow dr)
{
Guest guest = new Guest();
guest.FirstName = dr.ItemArray[0].ToString();
return guest;
}
public class Guest
{
public string FirstName { get; set; }
}
}
}
这是按预期工作的。同样,当用户单击数据杂志时,过滤器将用" John"的名字过滤出用户。
我想发生的事情是让用户能够在txtfirstnamefilter textbox中键入一个名字和数据杂志,然后滤除包含名字中文本的记录,使其可见,而其他的记录则没有。不可见的名字。
我可以做到的是使用文本框的文本变成属性的附加属性?这是一个问题,因为我不知道如何执行附件属性,然后确保该附件属性实际上更改时,请调用AssocledObjectonMouseup方法来运行过滤。
System.Windows.Interactivity.Behavior<T>
从dependencyObject继承。因此,给它一个依赖性属性并约束。
public class UpdateDataGridOnTextboxChange : Behavior<DataGrid>
{
#region FilterValue Property
public String FilterValue
{
get { return (String)GetValue(FilterValueProperty); }
set { SetValue(FilterValueProperty, value); }
}
public static readonly DependencyProperty FilterValueProperty =
DependencyProperty.Register(nameof(FilterValue), typeof(String), typeof(UpdateDataGridOnTextboxChange),
new FrameworkPropertyMetadata(null, FilterValue_PropertyChanged));
protected static void FilterValue_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
(d as UpdateDataGridOnTextboxChange).OnFilterValueChanged(e.OldValue);
}
private void OnFilterValueChanged(object oldValue)
{
// Do whatever you do to update the filter
// I did a trace just for testing.
System.Diagnostics.Trace.WriteLine($"Filter value changed from '{oldValue}' to '{FilterValue}'");
}
#endregion FilterValue Property
/*****************************************
All your code here
*****************************************/
}
xaml:
<i:Interaction.Behaviors>
<utils:UpdateDataGridOnTextboxChange
FilterValue="{Binding Text, ElementName=txtFirstNameFilter}"
/>
</i:Interaction.Behaviors>
您应该重命名。它与文本框无关。您可以将FilterValue
绑定到ViewModel属性,或Combobox中的选定值,或其他。
更新
op在文本框失去焦点时仅更新FilterValue
的绑定而遇到麻烦。这不是我看到的,但我不知道两者之间有什么不同。
没有Binding
的任何UpdateTargetTrigger属性,但是当两个都是依赖关系对象的依赖关系属性时,您可以交换源和目标。这对我有用:
<TextBox
x:Name="txtFirstNameFilter"
Text="{Binding FilterValue, ElementName=DataGridFilterThing, UpdateSourceTrigger=PropertyChanged}"
/>
<!-- snip snip snip -->
<i:Interaction.Behaviors>
<local:UpdateDataGridOnTextboxChange
x:Name="DataGridFilterThing"
/>
</i:Interaction.Behaviors>