Public Overloads Sub InsertEmptyPoints( _
   ByVal interval As Double, _
   ByVal intervalType As IntervalType, _
   ByVal intervalOffset As Double, _
   ByVal intervalOffsetType As IntervalType, _
   ByVal seriesName As String _
) 

Visual Basic (Usage)	Copy Code
Dim instance As DataManipulator Dim interval As Double Dim intervalType As IntervalType Dim intervalOffset As Double Dim intervalOffsetType As IntervalType Dim seriesName As String   instance.InsertEmptyPoints(interval, intervalType, intervalOffset, intervalOffsetType, seriesName)

public void InsertEmptyPoints( 
   double interval,
   IntervalType intervalType,
   double intervalOffset,
   IntervalType intervalOffsetType,
   string seriesName
)

Parameters

interval

The interval that is checked for missing data points.

Interval size.

intervalType

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

intervalOffset

Determines the grouping interval offset.
Interval offset size.

intervalOffsetType

Determines the unit of measurement for the offset.
Interval offset type.

seriesName

The name(s) of the series  that will have data points grouped together. For multiple series use a comma-separated list, or use an asterisk (*) to group all existing series.
Series name to insert the empty points in.

The following sample checks for missing data for each Saturday. Note that we first add randomly-sized data points to "Series1", but we do not add points if it is Saturday or Sunday.

Visual Basic

Copy Code

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 ' Insert empty points. Notice that we check one day a week, with an offset of "6" specifying each Saturday Chart1.DataManipulator.InsertEmptyPoints(1, IntervalType.Weeks, 6, IntervalType.Days, "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 set the intervalOffset parameter to a non-zero value (e.g. a value of "1" will offset the day to be checked from Sunday to Monday).

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