Question

我正在开发通用Windows应用程序，在我当前的项目中，我显示了如下图所示的日历事件。

当我第一次打开我的应用程序时，它会询问登录提示AAD，然后在登录成功后，只显示单个事件，但不显示多个事件。而且，当我点击我的注销按钮，然后再次点击我的登录按钮时，同样的问题就发生了。

这是用户首次成功登录应用程序后的图像。

但是当我第二次打开我的应用程序时，它显示了所有事件，如第一张图片。

这是我在XAML页面中编写的代码。

SELECT ID,
       MAX(CASE WHEN alias = 'test1' THEN value ELSE NULL END) AS test1,
       MAX(CASE WHEN alias = 'test2' THEN value ELSE NULL END) AS test2,
       MAX(CASE WHEN alias = 'test3' THEN value ELSE NULL END) AS test3
FROM yourTable
GROUP BY ID

这是将数据绑定到列表视图和网格视图的类文件。

<Grid Margin="0,05,0,0"  Background="Transparent" Height="60">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
                <RowDefinition Height="*"/>
                <RowDefinition Height="*"/>
                <RowDefinition Height="*"/>
                <RowDefinition Height="*"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="70"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Rectangle Fill="#2B88D8" Grid.RowSpan="6" Margin="0,0,20,0" Visibility="{Binding TimeLineVisibility}"/>
            <Line Stroke="#2B88D8" X1="1300" Y1="0"  Grid.ColumnSpan="2" Margin="43,0,0,0"
               Grid.Row="{Binding RowNum}" Grid.RowSpan="{Binding RowSpanNum}"
                  StrokeDashArray="3,2"
                  StrokeThickness="1"  VerticalAlignment="Center" Visibility="{Binding TimeLineVisibility}"/>
            <StackPanel Grid.Column="0" Orientation="Horizontal" VerticalAlignment="Top"
                   Grid.Row="{Binding DateRowNum}" Grid.RowSpan="{Binding DateRowSpanNum}">
                <TextBlock Text="{Binding Hour}"  FontWeight="Light" Margin="5,0,0,0"  FontSize="15" Foreground="{Binding FontColor}" />
                <TextBlock Text="{Binding des}" FontWeight="Light" Margin="0,0,0,0"  FontSize="15" Foreground="{Binding FontColor}" />
            </StackPanel>
            <Grid Grid.ColumnSpan="2" Grid.RowSpan="6">
                <Grid.RowDefinitions>
                    <RowDefinition/>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition/>
                </Grid.RowDefinitions>
                <Line Stroke="#C3C3C3" X1="1300" Y1="0"  Grid.ColumnSpan="2" Grid.Row="1" Margin="62,-3,0,0"
                                                    StrokeThickness="1" StrokeDashArray="3,5"  VerticalAlignment="Center"/>

                <GridView  ItemsSource="{Binding EventsBefore30}" Grid.Row="0"
                           Visibility="{Binding LessThan30DescVisibility}"
                           Margin="62 0 0 2"
                           HorizontalAlignment="Stretch" 
                          HorizontalContentAlignment="Stretch">
                    <GridView.ItemContainerStyle>
                        <Style TargetType="GridViewItem">
                            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                            <Setter Property="VerticalContentAlignment" Value="Stretch"/>
                            <Setter Property="Margin" Value="0,0,0,0"/>
                            <Setter Property="Padding" Value="0"/>
                            <Setter Property="Height" Value="30"/>
                            <Setter Property="FontFamily" Value="Arial"/>
                        </Style>
                    </GridView.ItemContainerStyle>
                    <GridView.ItemTemplate>
                        <DataTemplate>
                            <Border Margin="0 -3 0 2" Padding="5,0,10,10" BorderBrush="#A6D1F5" Background="#C1E9FE" BorderThickness="5 0 0 0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
                                <StackPanel Orientation="Horizontal">
                                    <TextBlock Grid.Row="0" Text="{Binding Subject}"  HorizontalAlignment="Left"  VerticalAlignment="Center"  Grid.Column="1" FontWeight="Bold"  Margin="0,0,15,0"  FontSize="15" Foreground="Black" />
                                    <TextBlock Grid.Row="0" Text="{Binding Location}"  HorizontalAlignment="Left"  VerticalAlignment="Center"  Grid.Column="1"  Margin="0,0,0,0"  FontSize="12" Foreground="Black" />
                                </StackPanel>

                            </Border>
                        </DataTemplate>
                    </GridView.ItemTemplate>
                </GridView>
                <Border Grid.Row="0" Margin="62 -3 10 2" 
                        Visibility="{Binding IsSingleEventBefore30}" 
                        BorderBrush="#A6D1F5" Background="#C1E9FE" BorderThickness="5 0 0 0" 
                        HorizontalAlignment="Stretch">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Grid.Row="0" Text="{Binding LessThan30Desc}"  
                                   HorizontalAlignment="Left"  VerticalAlignment="Center"  
                                   Grid.Column="1" FontWeight="Bold"  Margin="0,0,15,0" 
                                   FontSize="15" Foreground="Black" />
                        <TextBlock Grid.Row="0" Text="{Binding LessThan30Loc}"  
                                   HorizontalAlignment="Left"  VerticalAlignment="Center"  
                                   Grid.Column="1" FontWeight="Bold"  Margin="0,0,0,0"  
                                   FontSize="12" Foreground="Black" />
                    </StackPanel>
                </Border>

                                   <Image  Grid.ColumnSpan="2" Grid.RowSpan="3" Height="1.4"  Stretch="Fill" 
                        VerticalAlignment="Bottom" HorizontalAlignment="Stretch" Margin="0,10,0,0"
                                Source="Assets/linebrown.png"></Image>
            </Grid>


        </Grid>


 <ListView x:Name="listview"  Grid.Column="0" 
                   Grid.Row="3"  Background="Transparent" 
                ItemTemplate="{StaticResource ListViewTemplateRequests}">
            <ListView.ItemContainerStyle>
                <Style TargetType="ListViewItem">
                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                    <Setter Property="FontFamily" Value="Arial"/>
                </Style>
            </ListView.ItemContainerStyle>



        </ListView>

}

我的逻辑后端代码没有问题。

-Pradeep

Answer 1

我将这两行代码更改为可观察的集合，然后它正常工作。

 private List<Events> _eventsBefore30;
//public List<Events> EventsBefore30 { get; set; }
private List<Events> _eventsAfter30

在我将上面的行更改为可观察的集合后，它看起来就像下面的行。

           private ObservableCollection<Events> _eventsBefore30=new ObservableCollection<Events>();

    //public List<Events> EventsBefore30 { get; set; }
    private ObservableCollection<Events> _eventsAfter30 = new ObservableCollection<Events>();

在另外一个DataTemplate中发布DataTemplate的XAML绑定？

1 个答案: