C# 自动刷新中未显示UWP网格数据
我是开发UWP桌面应用程序的新手。网格无法在自动刷新阶段显示数据 我正在尝试创建一个带有网格的页面,该网格将从数据库中检索数据。当页面加载时,我启动一个计时器,每10秒刷新一次网格。 当页面仅包含网格时,结果良好。 但如果在顶部添加命令栏,网格将无法在第一次刷新时显示数据。数据可以在第一次加载页面时显示。 谁能告诉我哪一部分做错了 代码隐藏:C# 自动刷新中未显示UWP网格数据,c#,uwp,grid,stackpanel,C#,Uwp,Grid,Stackpanel,我是开发UWP桌面应用程序的新手。网格无法在自动刷新阶段显示数据 我正在尝试创建一个带有网格的页面,该网格将从数据库中检索数据。当页面加载时,我启动一个计时器,每10秒刷新一次网格。 当页面仅包含网格时,结果良好。 但如果在顶部添加命令栏,网格将无法在第一次刷新时显示数据。数据可以在第一次加载页面时显示。 谁能告诉我哪一部分做错了 代码隐藏: public sealed partial class DataGridPage : Page { public string Titletext
public sealed partial class DataGridPage : Page
{
public string Titletext="";
public DataGridViewModel ViewModel { get; } = new DataGridViewModel();
DispatcherTimer dispatcherTimer;
DateTimeOffset startTime;
DateTimeOffset lastTime;
DateTimeOffset stopTime;
int timesTicked = 1;
int timesToTick = 10;
// TODO WTS: Change the grid as appropriate to your app, adjust the column definitions on DataGridPage.xaml.
// For more details see the documentation at https://docs.microsoft.com/windows/communitytoolkit/controls/datagrid
public DataGridPage()
{
InitializeComponent();
}
private void Page_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
DispatcherTimerSetup();
}
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
await ViewModel.LoadDataAsync();
//if (Titletext != "")
//{
// GridTitle.Text = Titletext;
//}
}
public void DispatcherTimerSetup()
{
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += dispatcherTimer_Tick;
dispatcherTimer.Interval = new TimeSpan(0, 0, 10);
//IsEnabled defaults to false
//FormattingCommandBar.Content += "dispatcherTimer.IsEnabled = " + dispatcherTimer.IsEnabled + "\n";
startTime = DateTimeOffset.Now;
lastTime = startTime;
//FormattingCommandBar.Content = "Calling dispatcherTimer.Start()";
dispatcherTimer.Start();
//IsEnabled should now be true after calling start
//GridTitle.Text += "dispatcherTimer.IsEnabled = " + dispatcherTimer.IsEnabled + "\n";
}
async void dispatcherTimer_Tick(object sender, object e)
{
DateTimeOffset time = DateTimeOffset.Now;
TimeSpan span = time - lastTime;
lastTime = time;
await ViewModel.LoadDataAsync();
//Time since last tick should be very very close to Interval
//FormattingCommandBar.Content = "Running dispatcherTimer: " + ViewModel.Source.Count;
timesTicked++;
if (timesTicked > timesToTick)
{
stopTime = time;
//FormattingCommandBar.Content = "Calling dispatcherTimer.Stop()\n";
dispatcherTimer.Stop();
//IsEnabled should now be false after calling stop
//GridTitle.Text += "dispatcherTimer.IsEnabled = " + dispatcherTimer.IsEnabled + "\n";
span = stopTime - startTime;
//GridTitle.Text += "Total Time Start-Stop: " + span.ToString() + "\n";
}
}
}
xaml(自动刷新时可显示数据)
xaml(如果添加stackpanel,则自动刷新时无法显示数据)
StackPanel
在术语上不支持数据虚拟化。这意味着处理大量数据是一团乱<代码>网格默认情况下支持数据虚拟化,这就是为什么它会刷新
您可以使用网格
。如果仍然需要StackPanel
请尝试
如果我想在网格顶部有一个commandbar,那么最好的方法是什么
方法
你可以这样做
<Page.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Button x:Name="ABC" Content="Options" Click="ABC_Click" ></Button>
<Grid x:Name="ContentArea" Grid.Row="1">
...
</Grid>
</Grid>
</Page.Content>
...
谢谢。如果我想在网格顶部有一个commandbar,最好的方法是什么?在我的回答中添加了解决方案No working。如果使用VirtualzingStackPanel,网格将消失,它将工作。请将主网格保留在网格中。Row=“1”和上面的命令栏现在将适用于您的用例。谢谢但它是高度而不是宽度
<Page.Content>
<StackPanel>
<Button x:Name="ABC" Content="Options" Click="ABC_Click" ></Button>
<Grid x:Name="ContentArea">
<Grid>
<controls:DataGrid
AutoGenerateColumns="False"
GridLinesVisibility="Horizontal"
ItemsSource="{x:Bind Mode=OneWay, Path=ViewModel.Source}" >
<controls:DataGrid.Columns>
<controls:DataGridTextColumn Binding="{Binding PaymentNo}" Header="Payment No." />
<controls:DataGridTextColumn Binding="{Binding PaymentDate}" Header="Payment Date" />
<controls:DataGridTextColumn Binding="{Binding Dept}" Header="Department" />
<controls:DataGridTextColumn Binding="{Binding PAYCD}" Header="Payee Code" />
<controls:DataGridTextColumn Binding="{Binding Vendor.companyName}" Header="Payee Name" />
<controls:DataGridTextColumn Binding="{Binding FC}" Header="F.C." />
<controls:DataGridTextColumn Binding="{Binding Amount}" Header="Amount" />
<controls:DataGridTextColumn Binding="{Binding CountryID}" Header="Country ID" />
</controls:DataGrid.Columns>
</controls:DataGrid>
</Grid>
</Grid>
</StackPanel>
</Page.Content>
<Page.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Button x:Name="ABC" Content="Options" Click="ABC_Click" ></Button>
<Grid x:Name="ContentArea" Grid.Row="1">
...
</Grid>
</Grid>
</Page.Content>