Public Overloads Function FindMaxValue( _
   ByVal useValue As String, _
   ByRef startFromIndex As Integer _
) As DataPoint

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

public DataPoint FindMaxValue( 
   string useValue,
   ref int startFromIndex
)

Parameters

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 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

A DataPoint object in the DataPointCollection with the maximum specified value. If no data point is found then null will be returned.

The following sample returns ALL data points with the maximum second Y-value. We then change the color of all returned data points.

Visual Basic

Copy Code

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

C#

Copy Code

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

This method starts the search at the specified index, and will return the first data point with the maximum value.

There may be more than one data point in the collection with a maximum value, and it is this maximum value that determines if a data point is returned. This definition can be used in a loop to locate ALL points in the collection that have a maximum value, and is accomplished by incrementing the startFromIndex parameter in the loop that is performing the search (see sample code below).

Note that a point will only be returned if its value is the maximum for all points in the collection.

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