如何在X轴上为System.Windows.Forms.DataVisualization.Charting设置DateTime范围？

Question

目前我正在尝试使用窗体显示图表,该窗体显示X轴上的月度数据和Y轴上的整数值; 但是,我没有为X轴正确设置范围,其中MonthYear是DateTime:

var pnChart = new System.Windows.Forms.Panel();
pnChart.Controls.Clear();
DataTable dtChartData = myDatabaseLayer.BuildDataTable("SELECT Added, Modified FROM tblStatistics WHERE ApplicationID = " + intApplicationID + " ORDER BY MonthYear");
Chart chart = GenerateChart(dtChartData, pnChart.Width, pnChart.Height, "ActiveBorder", 6);
chart.Series[0].XValueType = ChartValueType.DateTime;
chart.ChartAreas[0].AxisX.LabelStyle.Format = "yyyy-MM-dd";
chart.ChartAreas[0].AxisX.Interval = 1;
chart.ChartAreas[0].AxisX.IntervalType = DateTimeIntervalType.Months;
chart.ChartAreas[0].AxisX.IntervalOffset = 1;
pnChart.Controls.Add(chart);

问题是,当显示图表时,X轴的日期时间为"1900-01-01",所以我的问题是,如何设置日期范围从2013-01-01开始？

请注意我已经搜索了互联网并尝试了以下设置,但他们没有给我正确的范围:

chart.ChartAreas[0].AxisX.Maximum = DateTime.Now.Ticks;

要么,

chart.ChartAreas[0].AxisX.Crossing = DateTime.Now.Ticks;

要么,

chart.ChartAreas[0].AxisX.Minimum = DateTime.Now.Ticks;

TIA.

更新: 请注意我发现如何正确设置范围:

            chart.Series[0].XValueType = ChartValueType.DateTime;
            DateTime minDate = new DateTime(2013, 01, 01);
            DateTime maxDate = DateTime.Now;
            chart.ChartAreas[0].AxisX.Minimum = minDate.ToOADate();
            chart.ChartAreas[0].AxisX.Maximum = maxDate.ToOADate();

上面的代码为X轴设置了适当的范围; 但是,现在图表本身是空白的.

更新2:

是的,谢谢你DasKrumelmonster - 修好了!我使用http://www.codeproject.com/Articles/168056/Windows-Charting-Application中的代码,并且应该更仔细地查看作者的受保护内部图表GenerateChart(DataTable dtChartDataSource,int width,int height,string bgColor,int intType)函数.为了解决这个问题,我改变了这些方针:

foreach (DataRow dr in dtChartDataSource.Rows)
{
    double dataPoint = 0;
    double.TryParse(dr[dc.ColumnName].ToString(), out dataPoint);
    DataPoint objDataPoint = new DataPoint() { AxisLabel = "series", YValues = new double[] { dataPoint } };
     chart.Series[series].Points.Add(dataPoint);
}

对此:

DateTime dtStart = new DateTime(2013, 01, 01);
int intMonthCounter = 0;
//Add data points to the series
foreach (DataRow dr in dtChartDataSource.Rows)
{
    double dataPoint = 0;
    double.TryParse(dr[dc.ColumnName].ToString(), out dataPoint);
    DataPoint objDataPoint = new DataPoint() { AxisLabel = "series", YValues = new double[] { dataPoint } };
    chart.Series[series].Points.AddXY(dtStart.AddMonths(intMonthCounter),  dataPoint);
    intMonthCounter++;
}

谢谢!

Answer 1

无法重现.我试过这段代码:

private void button1_Click(object sender, EventArgs e)
{
    var s = new Series();
    s.ChartType = SeriesChartType.Line;

    var d = new DateTime(2013, 04, 01);

    s.Points.AddXY(d, 3);
    s.Points.AddXY(d.AddMonths(-1), 2);
    s.Points.AddXY(d.AddMonths(-2), 1);
    s.Points.AddXY(d.AddMonths(-3), 4);

    chart1.Series.Clear();
    chart1.Series.Add(s);


    chart1.Series[0].XValueType = ChartValueType.DateTime;
    chart1.ChartAreas[0].AxisX.LabelStyle.Format = "yyyy-MM-dd";
    chart1.ChartAreas[0].AxisX.Interval = 1;
    chart1.ChartAreas[0].AxisX.IntervalType = DateTimeIntervalType.Months;
    chart1.ChartAreas[0].AxisX.IntervalOffset = 1;

    chart1.Series[0].XValueType = ChartValueType.DateTime;
    DateTime minDate = new DateTime(2013, 01, 01).AddSeconds(-1);
    DateTime maxDate = new DateTime(2013, 05, 01); // or DateTime.Now;
    chart1.ChartAreas[0].AxisX.Minimum = minDate.ToOADate();
    chart1.ChartAreas[0].AxisX.Maximum = maxDate.ToOADate();
}

也许我在途中修复了你的错误.

它按预期工作:一行有四个数据点,所有x轴标签都是可见的,图表本身也是如此.如果仍有问题,请提供完整的测试代码以及​​应该发生什么以及实际发生的情况.