[求助]关于Silverlight 3 Toolkit中的Chart的问题

Question

由于要做图表，所以使用了Silverlight 3 Toolkit
图形是柱状图

XAML

<UserControl

 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" 

 mc:Ignorable="d" xmlns:charting="clr-namespace:System.Windows.Controls.DataVisualization.Charting;assembly=System.Windows.Controls.DataVisualization.Toolkit" x:Class="Code.Jxc.Charts.MainPage"

 d:DesignWidth="951" d:DesignHeight="176">

 <Grid x:Name="LayoutRoot" Width="951" Height="176">

  <Grid.RowDefinitions >

   <RowDefinition Height="176"></RowDefinition>

  </Grid.RowDefinitions>

  <Grid.ColumnDefinitions>

   <ColumnDefinition Width="951"></ColumnDefinition>

  </Grid.ColumnDefinitions>

  <charting:Chart Name="SxdcChart" Width="951" Height="176" Grid.Column="0" Grid.Row="0">

  </charting:Chart>

 </Grid>

</UserControl>

 C# 

public MainPage()
  {
   InitializeComponent();
   //jcc.GetDataCompleted += new EventHandler<GetDataCompletedEventArgs>(jcc_GetDataCompleted);//注册回调函数
    //jcc.GetDataAsync();//获取Web服务的数据
    this.SxdcChart.Axes.Add(new LinearAxis { Orientation = AxisOrientation.Y, Maximum = 700, Minimum = 0 });
   this.SxdcChart.Axes.Add(new CategoryAxis { Orientation = AxisOrientation.X });
   ColumnSeries cs = new ColumnSeries { Title = "Se1" };
   cs.IndependentValuePath = "Num";
   cs.DependentValuePath = "Value";
   this.SxdcChart.Series.Add(cs);
   cs.ItemsSource = new List<JxcChartData> 
   	{
  	new JxcChartData{ Num = "x1f" , Value = 201},
   	new JxcChartData{ Num = "x2f" , Value = 201}
	};
 }

 /// <summary>
 /// 用于封装柱状图的数据对象
 /// </summary>
 class JxcChartData
 {
  /// <summary>
  /// 数据库的编号
  /// </summary>
  public string Num { get; set; }

  /// <summary>
  /// 编号对应的值
  /// </summary>
  public double Value { get; set; }

 }

在C#代码中 SxdcChart 就是图表控件

编译运行之后...始终是以下错误
网页错误详细信息

用户代理: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E)
时间戳: Wed, 11 Aug 2010 05:32:04 UTC


消息: Unhandled Error in Silverlight Application 未将对象引用设置到对象的实例。 位于 System.Windows.Controls.DataVisualization.Charting.ColumnSeries.<>c__DisplayClass8.<GetAxes>b__4()
  位于 System.Windows.Controls.DataVisualization.Charting.DataPointSeriesWithAxes.GetAxes(DataPoint firstDataPoint, Func`2 independentAxisPredicate, Func`1 independentAxisFactory, Func`2 dependentAxisPredicate, Func`1 dependentAxisFactory)
  位于 System.Windows.Controls.DataVisualization.Charting.ColumnSeries.GetAxes(DataPoint firstDataPoint)
  位于 System.Windows.Controls.DataVisualization.Charting.DataPointSeriesWithAxes.GetAxes()
  位于 System.Windows.Controls.DataVisualization.Charting.DataPointSeriesWithAxes.OnDataPointsChanged(IList`1 newDataPoints, IList`1 oldDataPoints)
  位于 System.Windows.Controls.DataVisualization.Charting.DataPointSingleSeriesWithAxes.OnDataPointsChanged(IList`1 newDataPoints, IList`1 oldDataPoints)
  位于 System.Windows.Controls.DataVisualization.Charting.ColumnBarBaseSeries`1.OnDataPointsChanged(IList`1 newDataPoints, IList`1 oldDataPoints)
  位于 System.Windows.Controls.DataVisualization.Charting.DataPointSeries.LoadDataPoints(IEnumerable newItems, IEnumerable oldItems)
  位于 System.Windows.Controls.DataVisualization.Charting.DataPointSeries.Refresh()
  位于 System.Windows.Controls.DataVisualization.Charting.DataPointSeries.OnSizeChanged(Object sender, SizeChangedEventArgs e)
  位于 System.Windows.FrameworkElement.OnSizeChanged(Object sender, SizeChangedEventArgs e)
  位于 MS.Internal.JoltHelper.RaiseEvent(IntPtr target, UInt32 eventId, IntPtr coreEventArgs, UInt32 eventArgsTypeIndex)
行: 1
字符: 1
代码: 0
URI: http://localhost:3141/Code.Jxc.ChartsTestPage.html



求教....
另外:
我在网上搜索了相关的教程。
为什么有的命名空间的名称是:MicroSoft.Windows.Controls.DataVisualization.Charting
而我的是:System.Windows.Controls.DataVisualization.Charting

?

Answer 1

你使用的是Silverlight 3还是Silverlight 4？

Silverlight 3的Toolkit和Silverlgiht 4的toolkit有一些命名空间不同，其中包括你的Chart类库。

下载对应版本的Toolkit应该就能解决你的问题。

参考这篇文章：

http://www.silverlightchina.net/html/learn/2009/0706/5.html

Answer 2

感谢回复..

我用的是 Silverlight 3 Toolkit