c# - .Net 4 图表控件问题

Question

我正在尝试使用下面的实时数据图表示例 http://code.msdn.microsoft.com/mschart但是尽管应用程序提供了 C# 代码以复制/粘贴到您的程序中，但我收到以下错误:找不到合适的方法来覆盖名为 Dispose 的函数。有谁知道怎么回事吗？

这是应用程序给出的确切代码。有人了解如何使用它吗？

using System.Windows.Forms.DataVisualization.Charting;
...
private Thread addDataRunner;
private Random rand = new Random();
private System.Windows.Forms.DataVisualization.Charting.Chart chart1;
public delegate void AddDataDelegate();
public AddDataDelegate addDataDel;
...

private void RealTimeSample_Load(object sender, System.EventArgs e)
{

    // create the Adding Data Thread but do not start until start button clicked
    ThreadStart addDataThreadStart = new ThreadStart(AddDataThreadLoop);
    addDataRunner = new Thread(addDataThreadStart);

    // create a delegate for adding data
    addDataDel += new AddDataDelegate(AddData);

}

private void startTrending_Click(object sender, System.EventArgs e)
{
    // Disable all controls on the form
    startTrending.Enabled = false;
    // and only Enable the Stop button
    stopTrending.Enabled = true;

    // Predefine the viewing area of the chart
    minValue = DateTime.Now;
    maxValue = minValue.AddSeconds(120);

    chart1.ChartAreas[0].AxisX.Minimum = minValue.ToOADate();
    chart1.ChartAreas[0].AxisX.Maximum = maxValue.ToOADate();

    // Reset number of series in the chart.
    chart1.Series.Clear();

    // create a line chart series
    Series newSeries = new Series( "Series1" );
    newSeries.ChartType = SeriesChartType.Line;
    newSeries.BorderWidth = 2;
    newSeries.Color = Color.OrangeRed;
    newSeries.XValueType = ChartValueType.DateTime;
    chart1.Series.Add( newSeries ); 

    // start worker threads.
    if ( addDataRunner.IsAlive == true )
    {
        addDataRunner.Resume();
    }
    else
    {
        addDataRunner.Start();
    }

}

private void stopTrending_Click(object sender, System.EventArgs e)
{
    if ( addDataRunner.IsAlive == true )
    {
        addDataRunner.Suspend();
    }

    // Enable all controls on the form
    startTrending.Enabled = true;
    // and only Disable the Stop button
    stopTrending.Enabled = false;
}

/// Main loop for the thread that adds data to the chart.
/// The main purpose of this function is to Invoke AddData
/// function every 1000ms (1 second).
private void AddDataThreadLoop()
{
    while (true)
    {
        chart1.Invoke(addDataDel);

        Thread.Sleep(1000);
    }
}

public void AddData()
{
    DateTime timeStamp = DateTime.Now;

    foreach ( Series ptSeries in chart1.Series )
    {
        AddNewPoint( timeStamp, ptSeries );
    }
}

/// The AddNewPoint function is called for each series in the chart when
/// new points need to be added.  The new point will be placed at specified
/// X axis (Date/Time) position with a Y value in a range +/- 1 from the previous
/// data point's Y value, and not smaller than zero.
public void AddNewPoint( DateTime timeStamp, System.Windows.Forms.DataVisualization.Charting.Series ptSeries )
{
    double newVal = 0;

    if ( ptSeries.Points.Count > 0 )
    {
        newVal = ptSeries.Points[ptSeries.Points.Count -1 ].YValues[0] + (( rand.NextDouble() * 2 ) - 1 );
    }

    if ( newVal < 0 )
        newVal = 0;

    // Add new data point to its series.
    ptSeries.Points.AddXY( timeStamp.ToOADate(), rand.Next(10, 20));

    // remove all points from the source series older than 1.5 minutes.
    double removeBefore = timeStamp.AddSeconds( (double)(90) * ( -1 )).ToOADate();
    //remove oldest values to maintain a constant number of data points
    while ( ptSeries.Points[0].XValue < removeBefore )
    {
        ptSeries.Points.RemoveAt(0);
    }

    chart1.ChartAreas[0].AxisX.Minimum = ptSeries.Points[0].XValue;
    chart1.ChartAreas[0].AxisX.Maximum = DateTime.FromOADate(ptSeries.Points[0].XValue).AddMinutes(2).ToOADate();

    chart1.Invalidate();
}

/// Clean up any resources being used.
protected override void Dispose( bool disposing )
{
    if ( (addDataRunner.ThreadState & ThreadState.Suspended) == ThreadState.Suspended)
    {
        addDataRunner.Resume();
    }
    addDataRunner.Abort();

    if( disposing )
    {
        if (components != null) 
        {
            components.Dispose();
        }
    }
    base.Dispose( disposing );
}       
...

Answer 1

您必须将复制的代码插入正确的类中。据我所知，只有继承自控件的类(例如 Forms、UserControls 等)才具有 Dispose 方法。

只需将您复制的代码粘贴到一个新的表单中，它就会起作用。