在Silverlight中创建PieChart

时间:2011-03-03 20:51:53

标签: silverlight ria

我正在Silverlight中创建一个仪表板。我正在尝试创建一个饼图,如下所示:

<ria:DomainDataSource AutoLoad="True" Name="orderDomainDataSource" 
  QueryName="GetOrdersQuery">
  <ria:DomainDataSource.DomainContext>
    <my:PresentationDomainContext />
  </ria:DomainDataSource.DomainContext>
</ria:DomainDataSource>
<toolkit:Chart Name="chart1" Title="">
  <toolkit:Chart.Series>
   <toolkit:PieSeries 
     ItemsSource="{Binding ElementName=orderDomainDataSource, Path=Data}" 
     IndependentValueBinding="{Binding Path=OrderDate.Month}" 
     DependentValueBinding="{Binding Path=TotalAmount}" />
  </toolkit:Chart.Series>
</toolkit:Chart>

我的数据源有数百个订单。订单跨越三个月。我想按月分组饼图。由于这个原因,我将IndependentValueBinding设置为OrderDate.Month。但是,我注意到这些项目没有自动分组。如何按月以声明方式对数据进行分组以便以这种方式显示数量?

非常感谢你的帮助!

2 个答案:

答案 0 :(得分:2)

工具包中的图表仅用于显示所提供数据的图表。它不会为您进行任何聚合,您需要在将数据提供给图表之前对数据执行此操作。

在这种情况下,您需要创建一个新的查询方法,该方法执行汇总,该汇总返回一个集合,每月只包含一个对象,并包含该月的总金额。

答案 1 :(得分:1)

假设您的OrderTable中有两列名为OrderDate和TotalAmount(作为DataSource)。

现在您需要编写一个查询来按月对数据进行分组。由于您将数据存储在特定年份的3个月中,因此您可能无需在此处注意年份。因此,用于计算月总金额的LINQ查询可以如下所示。

    var totalAmountByMonth = (from record in orders
                              group record by record.Date.Month
                                  into groupedOrder
                                  select new KeyValuePair<String, Double>
                                  (groupedOrder.First().Date.ToString("MMMM"),
                                  groupedOrder.Sum(a => a.Amount)));

因为我之前在Visifire工作,所以我使用Visifire

创建了这个饼图示例

在此示例中,结果从Orders中提取为名称值对,并累积存储在totalAmountByMonth中。然后通过将AxisXLabel设置为Month并将Amount设置为YValue将其绑定到图表。这是下面的代码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Visifire.Charts;

namespace BindingDemo
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            // Temp list of orders
            List<Order> orders = new List<Order>();

            orders.Add(new Order() { Date = new DateTime(2010, 1, 1), Amount = 1213 });
            orders.Add(new Order() { Date = new DateTime(2010, 1, 3), Amount = 1273 });
            orders.Add(new Order() { Date = new DateTime(2010, 1, 4), Amount = 1253 });
            orders.Add(new Order() { Date = new DateTime(2010, 1, 5), Amount = 213 });
            orders.Add(new Order() { Date = new DateTime(2010, 1, 5), Amount = 1300 });

            orders.Add(new Order() { Date = new DateTime(2010, 2, 1), Amount = 1213 });
            orders.Add(new Order() { Date = new DateTime(2010, 2, 3), Amount = 1255 });
            orders.Add(new Order() { Date = new DateTime(2010, 2, 4), Amount = 1290 });
            orders.Add(new Order() { Date = new DateTime(2010, 2, 5), Amount = 1731 });
            orders.Add(new Order() { Date = new DateTime(2010, 2, 5), Amount = 2173 });

            orders.Add(new Order() { Date = new DateTime(2010, 3, 1), Amount = 1213 });
            orders.Add(new Order() { Date = new DateTime(2010, 3, 3), Amount = 1243 });
            orders.Add(new Order() { Date = new DateTime(2010, 3, 4), Amount = 1263 });
            orders.Add(new Order() { Date = new DateTime(2010, 3, 5), Amount = 1273 });
            orders.Add(new Order() { Date = new DateTime(2010, 3, 5), Amount = 1233 });

            var totalAmountByMonth = (from record in orders
                                      group record by record.Date.Month
                                          into groupedOrder
                                          select new KeyValuePair<String, Double>(groupedOrder.First().Date.ToString("MMMM"),
                                              groupedOrder.Sum(a => a.Amount)));

            // Setting DataContext of Chart
            chart.DataContext = totalAmountByMonth;

        }

        public class Order
        {
            public DateTime Date;
            public int Amount;

        }
    }
}

:XAML:

<vc:Chart Name="chart" Width="500" Height="300" Theme="Theme1" View3D="True">
    <vc:Chart.Series>
        <vc:DataSeries RenderAs="Pie" DataSource="{Binding}">
            <vc:DataSeries.DataMappings>
                <vc:DataMapping MemberName="AxisXLabel" Path="Key"></vc:DataMapping>
                <vc:DataMapping MemberName="YValue" Path="Value"></vc:DataMapping>
            </vc:DataSeries.DataMappings>
        </vc:DataSeries>
    </vc:Chart.Series>
</vc:Chart>

输出:

enter image description here