在WPF中重新加载DataGrid之后如何保存位置 [英] How to save position after reload DataGrid in WPF
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问题描述
我说的是DataGrid 不是DataGridView ！
我在这里正在刷新包含< DataGrid.GroupStyle> 的数据网格，并且我正在显示按顺序对数据库进行分组的数据，并且我想做的就是刷新我的数据网格。
I'm talking about DataGrid not DataGridView!
What I'm doing here is refreshing datagrid which contains <DataGrid.GroupStyle> and I'm showing my data from database grouped by number of order, and what I want to do is refresh my datagrid.
这是我的代码：
public MainWindow()
{
try
{
InitializeComponent();
this.WindowStartupLocation = WindowStartupLocation.CenterScreen;
this.WindowState = WindowState.Maximized;
var ordersList = OrdersController.localOrders();
collectionViewSource.Source = ordersList;
collectionViewSource.GroupDescriptions.Add(new PropertyGroupDescription("NumberOfOrder"));
DataContext = collectionViewSource;
DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromSeconds(8);
timer.Tick += timer_Tick;
timer.Start();
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
void timer_Tick(object sender, EventArgs e)
{
var ordersList = OrdersController.localOrders();
collectionViewSource.Source = null;
collectionViewSource.Source = ordersList;
DataContext = collectionViewSource;
datagrid1.ScrollIntoView(datagrid1.Items[datagrid1.Items.Count - 1]);
}
}
XAML：
<DataGrid HorizontalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Hidden" BorderBrush="#83D744" IsSynchronizedWithCurrentItem="False" VerticalGridLinesBrush="Transparent" Grid.Column="0" RowHeaderWidth="0" CanUserAddRows="False" AutoGenerateColumns="False" x:Name="datagrid1" Margin="10,150,8,50" Background="Transparent" RowBackground="#FF494949" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" ItemsSource="{Binding}">
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="Background" Value="#83D744"/>
<Setter Property="Opacity" Value="1"/>
<Setter Property="Foreground" Value="White"/>
<Setter Property="HorizontalContentAlignment" Value="Center" />
<Setter Property="FontSize" Value="18"/>
<Setter Property="FontFamily" Value="Arial"/>
<Setter Property="Height" Value="50"/>
</Style>
<Style x:Key="TextInCellCenter" TargetType="{x:Type TextBlock}" >
<Setter Property="TextAlignment" Value="Center"/>
</Style>
<Style TargetType="{x:Type TextBlock}" x:Key="RightAligElementStyle">
<Setter Property="TextAlignment" Value="Right"/>
</Style>
<Style TargetType="{x:Type TextBlock}" x:Key="LeftAligElementStyle">
<Setter Property="TextAlignment" Value="Left"/>
</Style>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}"
Color="Transparent"/>
</DataGrid.Resources>
<DataGrid.Columns >
<DataGridTextColumn Binding="{Binding ProductName}" ElementStyle="{StaticResource LeftAligElementStyle}" Header="NAZIV ARTIKLA" MinWidth="350" Foreground="White" FontSize="20" FontFamily="Verdana" />
<DataGridTextColumn Binding="{Binding Quantity}" ElementStyle="{StaticResource TextInCellCenter}" Header="KOLIČINA" MinWidth="200" Foreground="White" FontSize="20" FontFamily="Verdana" />
</DataGrid.Columns>
<DataGrid.GroupStyle>
<!-- Style for groups at top level. -->
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="True" Background="Black" Opacity="0.7">
<Expander.Header >
<DockPanel Height="50" Margin="0,0,0,0" Name="dockPanel" Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid}}, Path=ActualWidth}">
<Button Name="btnFinishOrder" Content="Finish Order" Margin="0,0,55,5" DockPanel.Dock="Right" Click="btnFinishOrder_Click" FontSize="12" BorderThickness="1.5" HorizontalAlignment="Left" VerticalAlignment="Bottom" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Foreground="#83D744" Background="Transparent" BorderBrush="#83D744" Width="130" Height="40">
<Button.Template>
<ControlTemplate TargetType="Button">
<Border BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush= "{TemplateBinding BorderBrush}"
Background= "{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Border>
</ControlTemplate>
</Button.Template>
</Button>
<Button Name="btnTakeIt" Click="btnTakeIt_Click" Content="Take it" Margin="0,0,20,5" DockPanel.Dock="Right" FontSize="12" BorderThickness="1.5" HorizontalAlignment="Left" VerticalAlignment="Bottom" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Foreground="#83D744" Background="Transparent" BorderBrush="#83D744" Width="130" Height="40">
<Button.Template>
<ControlTemplate TargetType="Button">
<Border BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush="{TemplateBinding BorderBrush}"
Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Border>
</ControlTemplate>
</Button.Template>
</Button>
<TextBlock FontWeight="Normal" FontFamily="Verdana" FontSize="20" Height="25" Foreground="#83D744" Text="{Binding Path=Name,StringFormat= Number of Order:# {0}}" />
</DockPanel>
</Expander.Header>
<Expander.Content>
<ItemsPresenter />
</Expander.Content>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</DataGrid.GroupStyle>
</DataGrid>
重新加载数据后，单元格选择会跳到第一列，并重置滚动条。如何保存DataGrid的位置？
after reload data, cell selection jumps on first column and scrollbars is reset. How to save position of DataGrid?
推荐答案
如果需要滚动到特定项目，只需保存索引并使用：
If you need to scroll to specific item, just save the index and use:
dataGrid.ScrollIntoView(dataGrid.Items[itemIndex]);
您可以使用它滚动到DataGrid中的最后一项：
You can use this to scroll to the last item in the DataGrid:
dataGrid.ScrollIntoView(dataGrid.Items[dataGrid.Items.Count - 1]);
编辑：
使用 CollectionViewSource 进行分组时， DataGrid 滚动似乎存在问题。
There seems to be a problem with DataGrid scrolling when using CollectionViewSource and grouping.
我设法使它以其他方式工作...而不是
I managed to get it to work the other way... Instead of
dataGrid.ScrollIntoView(dataGrid.Items[dataGrid.Items.Count - 1])
尝试使用以下代码进行滚动：
try using the following code to do the scrolling:
if (datagrid1.Items.Count > 0)
{
var border = VisualTreeHelper.GetChild(datagrid1, 0) as Decorator;
if (border != null)
{
var scrollViewer = border.Child as ScrollViewer;
if (scrollViewer != null) scrollViewer.ScrollToEnd();
}
}
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