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前言

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效果预览（更多效果请下载源码体验）

一、PieControl.cs 代码如下

using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using WpfPieControl.Models;

namespace WpfPieControl
{
public class PieControl: Control
{
public ObservableCollection PieSegmentModels
{
get { return (ObservableCollection)GetValue(PieSegmentModelsProperty); }
set { SetValue(PieSegmentModelsProperty, value); }
}

    public static readonly DependencyProperty PieSegmentModelsProperty =  
        DependencyProperty.Register("PieSegmentModels", typeof(ObservableCollection<PieSegmentModel>), typeof(PieControl), new UIPropertyMetadata(OnPieSegmentModelChanged));

    private static void OnPieSegmentModelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)  
    {  
        PieControl pieControl = d as PieControl;  
        if (e.NewValue != null)  
        {  
            var array = e.NewValue as ObservableCollection<PieSegmentModel>;  
            double angleNum = 0;  
            foreach (var item in array)  
            {  
                var color = new SolidColorBrush((Color)ColorConverter.ConvertFromString(pieControl.ColorArray\[array.IndexOf(item)\]));  
                item.Color = color;  
                item.StartAngle = angleNum;  
                item.EndAngle = angleNum + item.Value / 100 \* 360;  
                angleNum = item.EndAngle;  
            }  
        }  
    }  
    /// <summary>  
    /// colors  
    /// </summary>  
    private string\[\] ColorArray = new string\[\] { "#FDC006", "#607E89", "#2095F2", "#F34336" };

    /// <summary>  
    /// 0~1  
    /// </summary>  
    public double ArcThickness  
    {  
        get { return (double)GetValue(ArcThicknessProperty); }  
        set { SetValue(ArcThicknessProperty, value); }  
    }

    public static readonly DependencyProperty ArcThicknessProperty =  
        DependencyProperty.Register("ArcThickness", typeof(double), typeof(PieControl), new PropertyMetadata(1.0));

    static PieControl()  
    {  
        DefaultStyleKeyProperty.OverrideMetadata(typeof(PieControl), new FrameworkPropertyMetadata(typeof(PieControl)));  
    }  
}  

}

二、App.xaml 代码如下

三、MainWindow.xaml 代码如下

四、MainWindow.xaml.cs 代码如下

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using WpfPieControl.Models;

namespace WpfPieControl
{
///

/// MainWindow.xaml 的交互逻辑 ///

public partial class MainWindow : Window
{
public ObservableCollection PieSegmentModels
{
get { return (ObservableCollection)GetValue(PieSegmentModelsProperty); }
set { SetValue(PieSegmentModelsProperty, value); }
}

    public static readonly DependencyProperty PieSegmentModelsProperty =  
        DependencyProperty.Register("PieSegmentModels", typeof(ObservableCollection<PieSegmentModel>), typeof(MainWindow), new PropertyMetadata(null));

    List<ObservableCollection<PieSegmentModel>> collectionList = new List<ObservableCollection<PieSegmentModel>>();  
    public MainWindow()  
    {  
        InitializeComponent();

        PieSegmentModels = new ObservableCollection<PieSegmentModel>();  
        var collection1 = new ObservableCollection<PieSegmentModel>();  
        collection1.Add(new PieSegmentModel { Name = "一", Value = 10 });  
        collection1.Add(new PieSegmentModel { Name = "二", Value = 20 });  
        collection1.Add(new PieSegmentModel { Name = "三", Value = 25 });  
        collection1.Add(new PieSegmentModel { Name = "四", Value = 45 });  
        var collection2 = new ObservableCollection<PieSegmentModel>();  
        collection2.Add(new PieSegmentModel { Name = "一", Value = 30 });  
        collection2.Add(new PieSegmentModel { Name = "二", Value = 15 });  
        collection2.Add(new PieSegmentModel { Name = "三", Value = 10 });  
        collection2.Add(new PieSegmentModel { Name = "四", Value = 55 });  
        collectionList.AddRange(new\[\] { collection1, collection2 });

        PieSegmentModels = collectionList\[0\];  
    }  
    bool isRefresh = false;  
    private void Button\_Click(object sender, RoutedEventArgs e)  
    {  
        if (!isRefresh)  
            PieSegmentModels = collectionList\[1\];  
        else  
            PieSegmentModels = collectionList\[0\];  
        isRefresh = !isRefresh;

    }  
}  

}

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