Public Overloads Sub InsertEmptyPoints( _
   ByVal interval As Double, _
   ByVal intervalType As IntervalType, _
   ByVal series As Series _
) 

Visual Basic (Usage)	Copy Code
Dim instance As DataManipulator Dim interval As Double Dim intervalType As IntervalType Dim series As Series   instance.InsertEmptyPoints(interval, intervalType, series)

public void InsertEmptyPoints( 
   double interval,
   IntervalType intervalType,
   Series series
)

Parameters

interval

The interval that is checked for missing data points.

Interval size.

intervalType

The unit of measurement for the interval parameter.
Interval type.

series

The Series object that is checked.
Series to insert the empty points in.

The following sample demonstrates how to insert empty points for every day that does not have a data point. Note that we first add randomly-sized data points to "Series1", but we do not add points if it is Saturday or Sunday. When the InsertEmptyPoints method is called an empty point will then be inserted for each Saturday and Sunday.

Visual Basic

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Imports Dundas.Charting.WinControl ... Dim currentDate As DateTime Dim randomValues As New Random() Dim i As Int32 ' Initialize variables currentDate = DateTime.Now.Date ' Add randomly-sized data points to Series1 if date is not a Saturday or Sunday For i = 0 To 20     If currentDate.AddDays(i).DayOfWeek <> DayOfWeek.Sunday And currentDate.AddDays(i).DayOfWeek <> DayOfWeek.Saturday Then         Chart1.Series("Series1").Points.AddXY(currentDate.AddDays(i), randomValues.Next(0, 100))     End If Next ' Empty points will be inserted for Saturdays and Sundays. We check for missing data for each day. Chart1.DataManipulator.InsertEmptyPoints(1, IntervalType.Days, Chart1.Series("Series1"))

The series range that is checked for missing data is automatically determined by the minimum and maximum X-values of the series' data points. To check a smaller range use another definition of this function that has fromXValue and toXValue parameters.

When using an IntervalType of IntervalType.Days know that Sunday is regarded as the first day of the week.

To check one specific day of the week that is not Sunday use another definition of this function that takes an intervalOffset parameter.

The drawing style of empty points is set by the Series.EmptyPointStyle property.

Target Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

Reference