Question

如何绑定到System.Windows.Forms.DataVisualization.Charting.Chart对象，以便在基础数据发生变化时更新图表？

我设法将图表与底层的双打数组绑定：

double[] DoubleArray = new double[] {1.0, 2.0, 3.0, 4.0};

MyChart.Series[0].Points.DataBindY(DoubleArray);

但是当数组中的值发生变化时，它不会更新图表。

所以我尝试用BindingList实现绑定：

class Model
{
    public BindingList<double> DoubleList { get; set; }
    public Model()
    {
        //Initialize BindingList
        DoubleList = new BindingList<double>();
        DoubleList.Add(1.0);
        DoubleList.Add(2.0);
        DoubleList.Add(3.0);
        DoubleList.Add(4.0);
    }

    public void UpdateModel(double y0, double y1, double y2, double y3)
    {
        //Just a simple example - of course you could do checks and only
        //update values where required.
        DoubleList[0] = y0;
        DoubleList[1] = y1;
        DoubleList[2] = y2;
        DoubleList[3] = y3;
    }
}

代码格式：

class MyForm : Form
{
    Model _Model = new Model();

    public MyForm()
    {
        InitializeComponent();
        MyChart.Series[0].Points.DataBindY(_Model.DoubleList); //Binds successfully and displays chart with initial values.

    }

    //Why doesn't this update the chart?
    private void button1_Click(object sender, EventArgs e)
    {
        _Model.UpdateModel(4.0, 5.0, 6.0, 7.0);  //Has no effect on chart... what do I do wrong?
    }

}

Answer 1

试试这个。

public partial class MyForm : Form
{
    Model _Model = new Model();

    public MyForm()
    {
        InitializeComponent();

        MyChart.Series.First().XValueMember = "X";
        MyChart.Series.First().YValueMembers = "Y";

        MyChart.DataSource = _Model.DoubleList;
    }

    private void button1_Click( object sender, EventArgs e )
    {
        _Model.UpdateModel( 4.0, 5.0, 6.0, 7.0 );
        MyChart.DataBind();
    }
}

Answer 2

更新列表后，您错过了对MyChart.DataBind()（或MyChart.Series[0].Points.DataBind()）的来电。您还可以从BindingSource创建一个新的BindingList，并绑定到该BindingSource source = new BindingSource(_Model.DoubleList, null); MyChart.Series[0].Points.DataBindY(source); // In your button click method _Model.Update(4, 5, 6, 7); // This should update your chart, since you used a BindingSource而不是列表，该列表应自动处理更新：

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如何连续绑定到Chart

2 个答案: