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在上一篇中，我们介绍了在MVVM模式下使用C1Chart。那么如何在C1Chart动态的添加和删除数据序列？本文就在上一节的基础上，就此内容展开讨论。

如果我们在C1chart的model下有大量的bindings，那么ChartData需要接受一个binding。我们可以简单的设计一个C1ChartData属性，暴露在ViewModel，然后运行时从这个ChartData中添加和删除序列。我们通过下面的实现，让用户更加清楚地了解。

首先，需要在Visual Studio中创建一个WPF工程。在Sales类的基础上展示数据，因此我们需要创建这个类。代码如下：

public class Sales:INotifyPropertyChanged
{
public Sales(string product,double salevalue,double volume,string shipcity,double discount)
{
_product = product;
_salevalue = salevalue;
_volume = volume;
_shipcity = shipcity;
_discount = discount;
_variance = (_volume*1000/_salevalue);
}
#region privateFields
string _product;
double _salevalue;
double _volume;
double _discount;
string _shipcity;
double _variance;
#endregion

#region publicProperties
public string Product
{
get { return _product; }
set { _product = value; }
}
public double SaleValue
{
get { return _salevalue; }
set { _salevalue = value; OnPropertyChanged("SaleValue"); }
}
public double Volume
{
get { return _volume; }
set { _volume = value; OnPropertyChanged("Volume"); }
}
public double Discount
{
get { return _discount; }
set { _discount = value; OnPropertyChanged("Discount"); }
}
public double Variance
{
get { return (this.Volume*1000/ this.SaleValue); }
}
public string ShipCity
{
get { return _shipcity; }
set { _shipcity = value; OnPropertyChanged("ShipCity"); }
}
#endregion

#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string property)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
#endregion
}

在这个类中，我们有六个fields：Salevalue (产品的销售价格), Volume (产品的出售体积), Discount (产品折扣), ShipCity (发货城市), and Variance (假设方差)。

接下来，我们需要创建ViewModelBase从INotifyPropertyChanged接口继承。我们的ChartViewModel将从这个base viewmodel继承。如下是base viewmode代码：

public class ViewModelBase:INotifyPropertyChanged
{
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string property)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
#endregion
public ViewModelBase()
{
}
}

现在就可以创建ChartViewModel。如下是代码：

public class ChartViewModel:ViewModelBase
{
#region Ctor..
public ChartViewModel()
{
_saleslist = new ObservableCollection();
LoadData();
_axisvalues = new ObservableCollection();
_axisvalues.Add("SaleValue");
_axisvalues.Add("Volume");
_axisvalues.Add("VolumeVsCity");
_axisvalues.Add("ProductDiscount");
_axisvalues.Add("VolumeTotal");
_axisview = new CollectionView(_axisvalues);
_axisview.CurrentChanged += new EventHandler(_axisview_CurrentChanged);

_chartdata = new ChartData();
ChartDataView.ItemNameBinding = new Binding("Product");

DataSeries ds1 = new DataSeries();
ds1.Label = "SaleValue";
ds1.ValueBinding = new Binding("SaleValue");

DataSeries ds2 = new DataSeries();
ds2.Label = "Volume";
ds2.ValueBinding = new Binding("Volume");

ChartDataView.ItemsSource = SalesList;
ChartDataView.Children.Add(ds1);
ChartDataView.Children.Add(ds2);
}
#endregion

#region private Fields

ObservableCollection _saleslist;
ObservableCollection _axisvalues;
CollectionView _axisview;
ChartData _chartdata;
#endregion
#region publicProperties
public ObservableCollection SalesList
{
get { return _saleslist; }
set { _saleslist = value; }
}
public CollectionView AxisView
{
get { return _axisview; }
set { _axisview = value; OnPropertyChanged("AxisView"); }
}
public ChartData ChartDataView
{
get { return _chartdata; }
set { _chartdata = value; OnPropertyChanged("ChartDataView"); }
}
#endregion
#region privateMethods
void LoadData()
{
_saleslist.Add(new Sales("Confectionaries", 2500.00,300000.00,"NewYork",25.50));
_saleslist.Add(new Sales("Plastics", 3500.00,720000.00,"Newark",15.75));
_saleslist.Add(new Sales("Electronics", 7500.00,800000.00,"GeorgeTown",20.65));
_saleslist.Add(new Sales("Produces", 800.00,100000.00,"Houston",30.35));
}
void _axisview_CurrentChanged(object sender, EventArgs e)
{
if (_axisview.CurrentItem.ToString() == "SaleValue")
{
_chartdata.Children.Clear();

DataSeries ds1 = new DataSeries();
ds1.Label = "SaleValue";
ds1.ValueBinding = new Binding("SaleValue");
ds1.ItemsSource = SalesList;
_chartdata.Children.Add(ds1);
_chartdata.ItemNameBinding = new Binding("Product");
}
else if (_axisview.CurrentItem.ToString() == "Volume")
{
_chartdata.Children.Clear();
DataSeries ds2 = new DataSeries();
ds2.ValueBinding = new Binding("Volume");
ds2.Label = "Volume";
ds2.ItemsSource = SalesList;
_chartdata.Children.Add(ds2);
_chartdata.ItemNameBinding = new Binding("Product");
}
else if (_axisview.CurrentItem.ToString() == "VolumeVsCity")
{
_chartdata.Children.Clear();
DataSeries ds1 = new DataSeries();
ds1.Label="Volume";
ds1.ValueBinding = new Binding("Volume");
ds1.ItemsSource = SalesList;
_chartdata.Children.Add(ds1);
_chartdata.ItemNameBinding = new Binding("ShipCity");
}
else if (_axisview.CurrentItem.ToString() == "ProductDiscount")
{
_chartdata.Children.Clear();
DataSeries ds1 = new DataSeries();
ds1.Label = "Discount";
ds1.ValueBinding = new Binding("Discount");
ds1.ItemsSource = SalesList;
_chartdata.Children.Add(ds1);
_chartdata.ItemNameBinding = new Binding("Product");
}
else if (_axisview.CurrentItem.ToString() == "VolumeTotal")
{
_chartdata.Children.Clear();
DataSeries ds1 = new DataSeries();
ds1.Label = "Volume";
ds1.ValueBinding = new Binding("Volume");
ds1.ItemsSource = SalesList;
DataSeries ds2 = new DataSeries();
ds2.Label = "Variance";
ds2.ValueBinding = new Binding("Variance");
ds2.ItemsSource = SalesList;
_chartdata.Children.Add(ds1);
_chartdata.Children.Add(ds2);
_chartdata.ItemNameBinding = new Binding("Product");
}
}
#endregion
}

检查上述代码。有一个LoadData方法，可以导入数据到ObservableCollection"Sales"SalesList。这是一个ObservableCollection"string" _axisvalues集合，暴露了在运行时要用的dataseries。我们需要在构造器里，添加变量值到这个集合。另外，ChartDataView属性是ChartData类型。在构造器我们需要创建两个序列然后添加到ChartData。

现在当序列从ChartData添加或删除的时，我们需要_axisview_CurrentChanged事件。_axisview是 _axisvalues的collectionview 。在这个事件里，检查当前的选择和添加一个序列到chartdata。于是，我们需要绑定C1chart的Data属性到viewmodel的ChartDataView。因此，如下是在应用程序里的基本UI XAML代码：

<Window x:Class="C1ChartinMVVMPart2.MainWindow"
xmlns="//schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="//schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="336" Width="790" xmlns:c1chart="//schemas.componentone.com/xaml/c1chart">
<Grid x:Name="LayoutRoot" >
<c1chart:C1Chart Height="276" HorizontalAlignment="Left" Margin="153,9,0,0" Name="c1Chart1" VerticalAlignment="Top" Width="603" Data="{Binding ChartDataView}" Theme="{DynamicResource {ComponentResourceKey ResourceId=Vista, TypeInTargetAssembly=c1chart:C1Chart}}">
<c1chart:C1ChartLegend DockPanel.Dock="Right" />
</c1chart:C1Chart>
<ListBox Height="100" ItemsSource="{Binding AxisView}" HorizontalAlignment="Left" Margin="27,98,0,0" Name="listBox1" VerticalAlignment="Top" Width="120" Background="{Binding ElementName=c1Chart1,Path=Background}"/>
</Grid>
</Window>

将AXisView collectionview暴露给ListBox。这个Listbox就能展示所有可用的数据序列，然后将相关的数据序列画在C1chart中。添加如下代码在Application的startup事件中。

MainWindow win = new MainWindow();
C1ChartinMVVMPart2.ViewModel.ChartViewModel vm = new ViewModel.ChartViewModel();
win.LayoutRoot.DataContext = vm;
win.Show();

运行程序就能看到行为，如下是本文的Demo：

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