Public Overloads Function FindValue( _
   ByVal valueToFind As Double, _
   ByVal useValue As String, _
   ByRef startFromIndex As Integer _
) As DataPoint

Visual Basic (Usage)	Copy Code
Dim instance As DataPointCollection Dim valueToFind As Double Dim useValue As String Dim startFromIndex As Integer Dim value As DataPoint   value = instance.FindValue(valueToFind, useValue, startFromIndex)

public DataPoint FindValue( 
   double valueToFind,
   string useValue,
   ref int startFromIndex
)

Parameters

valueToFind

The value of the data point to find (e.g. 15.5).

Point value to find.

useValue

The point value to be examined (e.g. X, Y, Y2, etc.).

Which point value to use (X, Y1, Y2,...).

startFromIndex

The location within the collection to start the search at (0-based). If a matching data point is found this parameter will be populated with the index of the returned data point, otherwise it will be set to negative one (-1).

Index of the point to start looking from. Returns index of found point or -1.

Return Value

The first DataPoint object in the DataPointCollection that has the specified X or Y-value. If no matching data point is found then null will be returned.

In the following sample we search for data points in the DataPointCollection that have a second Y-value of 10. We then set the color of these points.

Visual Basic

Copy Code

Imports Dundas.Charting.WebControl ...     ' Declare data point index     Dim index As Integer = 0     ' Find all points that have value of 10, and change their color     Dim dataPoint As DataPoint = chart1.Series(0).Points.FindValue(10,"Y2",ref index)     ' Find any other points that have value of 10     While Not dataPoint Is Nothing         dataPoInteger.Color = Color.FromArgb(255, 128, 128)         index = index + 1         dataPoint = chart1.Series(0).Points.FindValue(10, "Y2", index)     End While ...

C#

Copy Code

using Dundas.Charting.WebControl; ...         // Declare data point index    int index = 0;         // Find all points that have value of 10, and change their color    DataPoint dataPoint = chart1.Series[0].Points.FindValue(10, "Y2", ref index);    // Find any other points that have value of 10    while (dataPoint != null)    {        dataPoint.Color = Color.FromArgb(255, 128, 128);        index = index + 1;        dataPoint = chart1.Series[0].Points.FindValue(10, "Y2", ref index);    }      ...

Returns the first matching data point that has the specified point value (e.g. the first data point with a Y1 value of 15.5).

This definition can be used in a loop to locate all data points in the collection that have a specific value. This is accomplished by incrementing the startFromIndex parameter in the loop that performs the search (see sample code below).

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