.NET Chart：如何添加具有不同于 double 的成员类型的 DataPoint？
我正在查看的命名空间是 .NET Framework 3.5 中的 System.Windows.Forms.DataVisualization.Charting。
我构建了一个名为 chart1 的 Chart，并向该图表添加了一个名为 mySeries 的 Series。
在设计器中该系列的数据部分中，我有：
IsXValueIndexed --> False
Name --> mySeries
Points --> (Collection)
XValueType --> DateTime
YValuesPerPoint --> 1
YValueType --> Int32
当我尝试将 DataPoint 添加到像这样的系列时，似乎我无法使用适当的 x 和 y 值添加它们类型：
public void InitializeChart()
{
Series theSeries = chart1.Series["mySeries"];
// MyData is of type List<MyDatum> and MyDatum has two members --
// one of type DateTime and another of type int
foreach (MyDatum datum in MyData)
{
// I'd like to construct a DataPoint with the appropriate types,
// but the compiler wants me to supply doubles to dp
DataPoint dp = new DataPoint(mySeries);
dp.XValue = datum.TimeStamp;
dp.YValue = datum.MyInteger;
radiosConnectedSeries.Points.Add(dp);
}
}
我缺少什么？一如既往的感谢！
The namespace I'm looking at is System.Windows.Forms.DataVisualization.Charting in .NET Framework 3.5.
I've constructed a Chart with name chart1 and added a Series called mySeries to that chart.
Within the Data section of that series in the designer, I have:
IsXValueIndexed --> False
Name --> mySeries
Points --> (Collection)
XValueType --> DateTime
YValuesPerPoint --> 1
YValueType --> Int32
When I try to add DataPoints to the series like this, it seems like I cannot add them with the x and y values of the appropriate type:
public void InitializeChart()
{
Series theSeries = chart1.Series["mySeries"];
// MyData is of type List<MyDatum> and MyDatum has two members --
// one of type DateTime and another of type int
foreach (MyDatum datum in MyData)
{
// I'd like to construct a DataPoint with the appropriate types,
// but the compiler wants me to supply doubles to dp
DataPoint dp = new DataPoint(mySeries);
dp.XValue = datum.TimeStamp;
dp.YValue = datum.MyInteger;
radiosConnectedSeries.Points.Add(dp);
}
}
What am I missing? Thanks as always!
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DateTime.ToOADate() 将返回时间戳作为双精度值，可用作 x 值
DateTime.ToOADate() will return the timestamp as a double that can be used as x value
DataPoint不接受 x 和 y 的其他类型。您需要使用datum.TimeStamp.Ticks进行排序/排序，然后设置AxisLabel属性 (string) 以显示 <代码>日期时间。DataPointdoesn't accept other types for x and y. You'll need to usedatum.TimeStamp.Ticksfor ordering/sorting, and then set theAxisLabelproperty (string) to display theDateTime.