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c# - LiveCharts 基础知识——如何画线?

转载 作者:太空狗 更新时间:2023-10-29 18:28:42 25 4
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我很难理解 LiveCharts 到底应该发生什么。我这里有一 block XAML:

<Grid>
<Grid.Background>
<ImageBrush ImageSource="/CPF;component/Images/background-top-cropped2.png" Stretch="None"></ImageBrush>
</Grid.Background>
<lvc:CartesianChart Series="{Binding myData}" LegendLocation="Right" x:Name="myChart">
<lvc:CartesianChart.AxisY>
<lvc:Axis Title="Sales" LabelFormatter="{Binding YFormatter}"></lvc:Axis>
</lvc:CartesianChart.AxisY>
<lvc:CartesianChart.AxisX>
<lvc:Axis Title="Month" Labels="{Binding Labels}"></lvc:Axis>
</lvc:CartesianChart.AxisX>
</lvc:CartesianChart>
</Grid>

代码在后面:

public MainWindow()
{
InitializeComponent();
DrawGraphs();
}
public void DrawGraphs()
{
LineSeries mySeries = new LineSeries
{
Values = new ChartValues<int> { 12, 23, 55, 1 }
};

myChart.Series.Add(mySeries);
}

在运行时,“myChart.Series.Add(mySeries)”会引发 Null Reference Exception 错误。我不确定如何解决这个问题?

最佳答案

因为您是将系列直接添加到图表中,而不使用 MVVM,所以您不需要 XAML 中的所有绑定(bind)。你可以简单地这样做:

XAML:

<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:lvc="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
xmlns:local="clr-namespace:WpfApplication1"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<lvc:CartesianChart x:Name="myChart" />
</Grid>

CS:

public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DrawGraphs();
}
public void DrawGraphs()
{
LineSeries mySeries = new LineSeries
{
Values = new ChartValues<int> { 12, 23, 55, 1 }
};

myChart.Series.Add(mySeries);
}
}

enter image description here

关于c# - LiveCharts 基础知识——如何画线?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42589775/

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