CurrentPosition财产没有被正确地更新 [英] CurrentPosition property not being updated properly
问题描述
让我再试一次...这里是XAML。你可以看到CollectionViewSource，使用它作为一个DataContext，ListView控件和删除按钮的网格。正在发生的事情是，当我在ListView在一行点击（和样式触发器触发选择ListViewItem的）被选中的行。当我点击删除按钮的onclick火灾，但CurrentPosition属性设置为-1。什么是preventing被更新CurrentPosition属性。
Let me try again...here is the XAML. You can see the CollectionViewSource, the Grid that uses it as a DataContext, the ListView, and the Delete button. What is happening is that when i click on a row in the ListView (and the Style trigger fires to select the ListViewItem) the row is selected. When i click the Delete button the onclick fires but the CurrentPosition property is set to -1. What is preventing the CurrentPosition property from being updated.
XAML
<Window x:Class="PretzelsUI.Admin.Ovens"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title=""
Height="344"
Width="474"
mc:Ignorable="d"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:my="clr-namespace:Pretzels.Model;assembly=Pretzels.Model"
ResizeMode="NoResize"
WindowStartupLocation="CenterOwner"
Background="{StaticResource WindowGradient}"
Loaded="Window_Loaded">
<Window.Resources>
<CollectionViewSource x:Key="ovenViewSource" d:DesignSource="{d:DesignInstance my:Oven, CreateList=True}" />
</Window.Resources>
<Grid DataContext="{StaticResource ovenViewSource}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Border Grid.Row="0" BorderBrush="{StaticResource formTitleBorderBrush}" BorderThickness="2" Name="border1" CornerRadius="30" Padding="7" Background="{StaticResource formTitleBackgroundBrush}" VerticalAlignment="Center" Margin="11">
<TextBlock Name="textBlock1" Text="Ovens" FontSize="18" FontWeight="Bold" Foreground="{StaticResource formTitleForegroundBrush}" />
</Border>
<ListView IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" Name="ovenListView" SelectionMode="Single" Height="177" Grid.Row="1" TabIndex="2" Margin="5,5,5,0">
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="Control.HorizontalContentAlignment" Value="Stretch" />
<Setter Property="Control.VerticalContentAlignment" Value="Stretch" />
<!--<Style.Triggers>
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Setter Property="IsSelected" Value="True" />
</Trigger>
</Style.Triggers>-->
</Style>
</ListView.ItemContainerStyle>
<ListView.View>
<GridView>
<GridViewColumn x:Name="nameColumn" Header="Name" Width="100">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Margin="-6,-1" Text="{Binding Path=OvenName, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true, UpdateSourceTrigger=PropertyChanged}" Width="Auto" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn x:Name="descriptionColumn" Header="Description" Width="300">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Margin="-6,-1" Text="{Binding Path=OvenDescription, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}" Width="Auto" MaxLength="100"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
<StackPanel Grid.Row="2" Name="stackPanel2" Margin="0,30,0,0" Orientation="Horizontal" VerticalAlignment="Center" HorizontalAlignment="Center">
<Button Content="New" Height="23" Margin="2,0,2,0" TabIndex="3" Name="btnAdd" Width="75" Click="btnInsrt_Click" />
<Button Content="Save" Height="23" Margin="2,0,2,0" TabIndex="4" Name="btnSave" Width="75" Click="btnSave_Click" />
<Button Content="Delete" Height="23" Margin="2,0,2,0" TabIndex="5" Name="btndelete" Width="75" Click="btndelete_Click" />
</StackPanel>
</Grid>
C＃
public partial class Ovens : Window
{
private PretzelEntities dbcontext = new PretzelEntities();
//private OvenCollection EntityData;
private CollectionViewSource ViewSource;
private BindingListCollectionView OvenView;
public Ovens()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
ViewSource = (CollectionViewSource)this.FindResource("ovenViewSource");
ViewSource.Source = from s in dbcontext.Ovens select s;
OvenView = (BindingListCollectionView)(ViewSource.View);
}
private void btndelete_Click(object sender, RoutedEventArgs e)
{
if (OvenView.CurrentPosition > -1)
{
if (MessageBox.Show("Do you really want to delete this Oven?", "Delete Confirmation", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
{
this.OvenView.RemoveAt(this.OvenView.CurrentPosition);
}
}
else
{
MessageBox.Show("Nothing to Delete.", "Error", MessageBoxButton.OK);
}
}
enter code here
我认为正在发生的事情是，当触发器在的ListCollectionView的CURRENTITEM / CurrentPosition没有被正确地更新。我不知道手动去这样做（虽然我知道可用的方法）当我在一行中的一个文本框点击。不知道该怎么做，我可能只是位于手动使用VisualTreeHelper所选的ListViewItem。
I think what is happening is that when the trigger fires the CurrentItem/CurrentPosition of the ListCollectionView is not being properly updated. I am not sure to go about doing this (although I know the methods available) manually when i click on a textbox in one of the rows. Not sure what to do so i may just manually located the selected ListViewItem using the VisualTreeHelper.
推荐答案
我终于放弃了对款式触发，只是处理的GotFocus事件为ListView行内的文本框/组合框。在一侧的处理，我是能够得到的ListViewItem，并设置IsSelected为true。工程就像一个冠军。
I finally gave up on the style trigger and just handled the GotFocus event for the textbox/combobox inside the ListView rows. In side the handler i was able to get the ListViewItem and set the IsSelected to true. Works like a champ.
private void TextBox_GotFocus(object sender, RoutedEventArgs e)
{
Control ctrl = sender as Control;
ContentPresenter cp = (ContentPresenter)ctrl.TemplatedParent;
GridViewRowPresenter gp = (GridViewRowPresenter)cp.Parent;
Grid g = (Grid)gp.Parent;
ListViewItem lvi = (ListViewItem)g.TemplatedParent;
lvi.IsSelected = true;
}
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