Performs custom filtering on one or more series' data points, based on the first series' points.
Filters data points using IDataPointFilter interface.
Syntax
| Visual Basic (Declaration) | |
|---|---|
Public Overloads Sub Filter( _ ByVal filterInterface As IDataPointFilter, _ ByVal inputSeriesNames As String, _ ByVal outputSeriesNames As String _ ) | |
| Visual Basic (Usage) |  Copy Code |
|---|---|
| |
| C# | |
|---|---|
public void Filter( IDataPointFilter filterInterface, string inputSeriesNames, string outputSeriesNames ) | |
Parameters
- filterInterface
- An object that implements the IDataPointFilter interface.
Filtering interface. - inputSeriesNames
- The name(s) of the series that will be filtered. For multiple series use a comma-separated list of names, and make sure that the series are aligned. An asterisk (*) may be used to filter all series, in which case the outSeriesName parameter must be empty.
Comma separated input series names. - outputSeriesNames
- The name(s) of the series that store the filtered data. Make sure that the number of output series matches the number of input series, otherwise an exception will be thrown.
Comma separated output series names.
Example
| Visual Basic | Copy Code |
|---|---|
Imports Dundas.Charting.WebControl<CRLF>...<CRLF><CRLF>' Implement the IDataPointFilter interface for our web form<CRLF>Public Class WebForm1<CRLF> Inherits System.Web.UI.Page<CRLF> Implements IDataPointFilter<CRLF> ...<CRLF> <CRLF> ' Declare function that contains the custom filtering logic (used by the Filter function)<CRLF> Public Function FilterDataPoint(ByVal point As DataPoint, ByVal series As Series, ByVal pointIndex As Integer) As Boolean _<CRLF> Implements IDataPointFilter.FilterDataPoint<CRLF> <CRLF> ' If Y2 (second Y value) is greater than 100 filter out this data point, otherwise keep it<CRLF> If point.YValues(1) > 100 Then<CRLF> FilterDataPoint = True<CRLF> Else<CRLF> FilterDataPoint = False<CRLF> End If<CRLF> <CRLF> End Function<CRLF> ...<CRLF> <CRLF> ' Perform filtering before data is displayed by chart<CRLF> Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load<CRLF> <CRLF> Chart1.DataManipulator.Filter(Me, "Series1 | |
| C# | Copy Code |
|---|---|
using Dundas.Charting.WebControl;<CRLF> ...<CRLF> <CRLF>public partial class _Default : System.Web.UI.Page, IDataPointFilter<CRLF>{<CRLF><CRLF> protected void Page_Load(object sender, System.EventArgs e)<CRLF> {<CRLF> Chart1.DataManipulator.Filter(this, "Series1 | |
Remarks
To utilize this method use a new or existing class (e.g. the WebForm class) that implements the IDataPointFilter interface and then override the FilterDataPoint method to provide custom filtering logic.
Note that filtering can be based on any attribute(s) of the data points (e.g. their first, second and third Y-values, etc.).
Filtering should only be applied to multiple series that are aligned, otherwise an exception will be thrown (for information concerning alignment of data see the Aligning Data topic). Note also that multiple series are filtered using the data points from the FIRST specified series. If two series must be filtered independently call the Filter method twice using one series as a parameter.
If a specified output series has not been created and added to the SeriesCollection when this function call is made it will be created and added to the collection automatically, and have default Series properties (e.g. column chart type, etc.). In addition, the ChartArea property of the series is set to "Default", and if a chart area with the name "Default" exists in the ChartAreasCollection it will be used to draw the chart. If there is no chart area with this name the first ChartArea object in the collection will be used to display the series.
Filters are always applied to an entire series.
Filtered points can be either removed from a series (default) or displayed as empty points, depending on the FilterSetEmptyPoints value.
Points can also be marked as filtered if they DO NOT match filtering criteria (determined by the FilterMatchPoints value).
Requirements
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