启用实时图表数据绑定时数据绑定停止工作

Question

如果我取出启用 wpf 实时图表的代码，那么我的数据绑定代码可以正常工作，但是当显示图表时，到我的标签的数据绑定不再显示数据字符串。

我使用 INotifyPropertyChanged 事件，我相信当我将数据上下文切换到图表时，就会出现问题。

我在一个单独的文件中有一个静态类来存储我的数据，我已将数据上下文包含在该本地类的 XAML 中，因此我可以从 XAML 中看到我的变量，这很好。

我显然在这里做错了什么。

` 本地：ComConnection/

    <Grid x:Name="Grid">
    <DockPanel x:Name="dp_Main" Background="#FF969696" LastChildFill="true" Width="Auto" DockPanel.Dock="Top">
        <Grid DockPanel.Dock="Top" Margin="1,1,1,1" >
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="350"/>
                <ColumnDefinition Width="10"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
            </Grid.RowDefinitions>
            <TabControl x:Name="tab_Hardware" Margin="2,2,2,2" >
                <TabItem Header="Finger Assembly Hardware" FontFamily="Segoe UI" FontSize="20">
                    <Grid Margin="1,1,1,1" >
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="50"/>
                        </Grid.RowDefinitions>
                        <!-- TEST PARAMETERS -->
                        <GroupBox x:Name="gb_HwParams"  Header="HARDWARE PARAMETERS" Margin="10,0,10,5" FontWeight="Bold" BorderBrush="Black" FontSize="16">
                            <Grid x:Name="Meter_Grid" Width="Auto" Height="Auto" Visibility="Visible" MinWidth="150" Margin="0">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="5*"/>
                                    <ColumnDefinition Width="5*"/>
                                </Grid.ColumnDefinitions>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="5" />
                                    <RowDefinition Height="26" />
                                    <RowDefinition Height="26" />
                                    <RowDefinition Height="26" />
                                    <RowDefinition Height="26" />
                                    <RowDefinition Height="5" />
                                </Grid.RowDefinitions>
                                <!-- HARDWARE -->
                                <Label Grid.Column="0" Content="Hardware:" FontSize="16" FontWeight="Normal" HorizontalContentAlignment="Right" VerticalContentAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Row="1" Padding="5,0,5,0" />
                                <Label Name="lbl_HwRev" Grid.Column="1" Content="{Binding Path=Hardware, UpdateSourceTrigger=PropertyChanged}" FontSize="16" FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Row="1" Padding="5,0,5,0" />

                                <Label Grid.Column="0" Content="Firmware:" FontSize="16" FontWeight="Normal" HorizontalContentAlignment="Right" VerticalContentAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Row="2" Padding="5,0,5,0" />
                                <Label Name="lbl_FwRev" Grid.Column="1" Content="N/A" FontSize="16" FontWeight="Bold" HorizontalContentAlignment="Left" VerticalContentAlignment="Stretch" HorizontalAlignment="Center" Grid.Row="2" Padding="5,0,5,0" />

                                <Label Grid.Column="0" Content="Status:" FontSize="16" FontWeight="Normal" HorizontalContentAlignment="Right" VerticalContentAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Row="3" Padding="5,0,5,0" />
                                <Label Name="lbl_Status" Grid.Column="1" Content="N/A" FontSize="16" FontWeight="Bold" HorizontalContentAlignment="Left" VerticalContentAlignment="Stretch" HorizontalAlignment="Center" Grid.Row="3" Padding="5,0,5,0" />

                                <Label Grid.Column="0" Content="Serial:" FontSize="16" FontWeight="Normal" HorizontalContentAlignment="Right" VerticalContentAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Row="4" Padding="5,0,5,0" />
                                <Label Name="lbl_Serial" Grid.Column="1" Content="N/A" FontSize="16" FontWeight="Bold" HorizontalContentAlignment="Left" VerticalContentAlignment="Stretch" HorizontalAlignment="Center" Grid.Row="4" Padding="5,0,5,0" />
                            </Grid>
                        </GroupBox>
                    </Grid>
                </TabItem>
            </TabControl>
            <TabControl x:Name="tab_DeviceData"  HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Column="2">
                <TabItem Header="Graph Data" FontFamily="Segoe UI" FontSize="20">
                    <Grid>
                        <lvc:CartesianChart Name="lc_MainChart" Series="{Binding ChartSeries}" AxisY="{Binding AxisYCollection}" Hoverable="False" Grid.Row="0" Grid.Column="1" DisableAnimations="True" LegendLocation="Right" Margin="2,2,2,2" BorderBrush="Black" BorderThickness="2,2,2,2" >
                            <lvc:CartesianChart.AxisX>
                                <lvc:Axis Title="DATA POINTS" FontSize="18" Labels="{Binding Labels}">
                                    <lvc:Axis.Separator>
                                        <lvc:Separator IsEnabled="False" Step="50"></lvc:Separator>
                                    </lvc:Axis.Separator>
                                </lvc:Axis>
                            </lvc:CartesianChart.AxisX>
                        </lvc:CartesianChart>
                    </Grid>
                </TabItem>
            </TabControl>
        </Grid>
    </DockPanel>
</Grid>
</Window>

`

如果我在创建图表数据后删除下面的行

this.DataContext = this;

然后我收到图表错误。

Answer 1

this.DataContext = this;覆盖 wpf 中设置的数据上下文。将您的代码放在一个类中