我在我的Xamarin.Forms(Portable)应用程序中使用OxyPlot创建了一个PieChart。我创建了一个名为 PieViewModel 的ViewModel,其中我声明了饼图的内容。在我的 SalesPage.XAML.cs 中,我调用ViewModel并访问其中的 salesmodel 。在我的XAML代码中,我在代码中绑定了 salesmodel 。
但是,我无法显示PieChart。以下是我使用的代码:
PieViewModel.cs
var hi = new Hello(1)
SalesPage.XAML.cs
using OxyPlot;
using OxyPlot.Series;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
namespace XamarinFormsDemo.ViewModels
{
public class PieViewModel : INotifyPropertyChanged
{
private PlotModel modelP1;
public PieViewModel()
{
modelP1 = new PlotModel { Title = "Pie Sample1" };
dynamic seriesP1 = new PieSeries { StrokeThickness = 2.0, InsideLabelPosition = 0.8, AngleSpan = 360, StartAngle = 0 };
seriesP1.Slices.Add(new PieSlice("Africa", 1030) { IsExploded = false, Fill = OxyColors.PaleVioletRed });
seriesP1.Slices.Add(new PieSlice("Americas", 929) { IsExploded = true });
seriesP1.Slices.Add(new PieSlice("Asia", 4157) { IsExploded = true });
seriesP1.Slices.Add(new PieSlice("Europe", 739) { IsExploded = true });
seriesP1.Slices.Add(new PieSlice("Oceania", 35) { IsExploded = true });
modelP1.Series.Add(seriesP1);
}
public PlotModel Model1
{
get { return modelP1; }
set { modelP1 = value; }
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
。 的 SalesPage.XAML
using OxyPlot;
using OxyPlot.Xamarin.Forms;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using XamarinFormsDemo.ViewModels;
using Xamarin.Forms;
namespace XamarinFormsDemo.Views
{
public partial class SalesPage : ContentPage
{
public SalesPage()
{
}
}
}
。 的 MainActivity.cs
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:oxy="clr-namespace:OxyPlot.Xamarin.Forms;assembly=OxyPlot.Xamarin.Forms"
xmlns:ViewModels="clr-namespace:XamarinFormsDemo.ViewModels;assembly=XamarinFormsDemo"
x:Class="XamarinFormsDemo.Views.SalesPage"
BackgroundImage="bg3.jpg"
Title="Sales Page">
<oxy:PlotView Model="{Binding Model1}" VerticalOptions="Center" HorizontalOptions="Center"/>
</ContentPage>
请帮我解决这个问题。我真的对事情的进展感到困惑。非常感谢。
答案 0 :(得分:3)
以下是一些示例代码:
应用:(便携式)
public class App : Application
{
public App()
{
MainPage = new Page3();
}
}
<强> XAML:强>
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:oxy="clr-namespace:OxyPlot.Xamarin.Forms;assembly=OxyPlot.Xamarin.Forms"
x:Class="App26.Page3">
<ContentPage.Content>
<oxy:PlotView Model="{Binding MyModel}"></oxy:PlotView>
</ContentPage.Content>
</ContentPage>
<强> CS:强>
public partial class Page3 : ContentPage
{
public MyViewModel vm { get; set; }
public Page3()
{
InitializeComponent();
vm = new MyViewModel();
BindingContext = vm;
}
}
<强>视图模型:强>
public class MyViewModel
{
public PlotModel MyModel { get; set; }
public MyViewModel()
{
PieSeries pieSeries = new PieSeries();
pieSeries.Slices.Add(new PieSlice("Africa", 1030) { IsExploded = false, Fill = OxyColors.PaleVioletRed });
pieSeries.Slices.Add(new PieSlice("Americas", 929) { IsExploded = true });
pieSeries.Slices.Add(new PieSlice("Asia", 4157) { IsExploded = true });
pieSeries.Slices.Add(new PieSlice("Europe", 739) { IsExploded = true });
pieSeries.Slices.Add(new PieSlice("Oceania", 350) { IsExploded = true });
MyModel = new PlotModel();
MyModel.Series.Add(pieSeries);
}
}
MainActivity :( Droid)
[Activity(Label = "App26", Icon = "@drawable/icon", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
{
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
global::Xamarin.Forms.Forms.Init(this, bundle);
OxyPlot.Xamarin.Forms.Platform.Android.PlotViewRenderer.Init();
LoadApplication(new App());
}
}