Nevron .NET Vision Documentation
Finding

The data series expose a set of operations which can help you find the index of a specific data item contained in them. Following is a description of these methods.

Finding minimum and maximum values

The FindMinValue and FindMaxValue methods can be used to find the index of the min and max values of a data series. The methods will raise an exception if you try to invoke them on a data series, which does not contain double values. Both methods return the index of the min or max value contained in the series. Following is an example of their usage:

C#
Copy Code
int minIndex = bar.Values.FindMinValue();
int maxIndex = bar.Values.FindMaxValue();
Visual Basic
Copy Code
Dim minIndex As Integer = bar.Values.FindMinValue()
Dim maxIndex As Integer = bar.Values.FindMaxValue()
Finding a concrete value

You can obtain the index of the first appearance of a specific value with the help of the FindValue and FindString methods of the NDataSeries class. If the specified value or string is not found in the data series the methods will return -1.

C#
Copy Code
int nFirstIndex = bar.Values.FindValue(43);
if (nFirstIndex == -1)
{
   // do something if value 43 not found
   ...
}
else
{
   // do something if value 43 is found
   ...
}

nFirstIndex = bar.Labels.FindString("LabelToSearchFor");
if (nFirstIndex == -1)
{
   // do something if label is not found
   ...
}
else
{
   // do something if label is found
   ...
}
Visual Basic
Copy Code
Dim nFirstIndex As Integer =  bar.Values.FindValue(43)
If nFirstIndex = -1 Then
   ' do something if value 43 not found
   ...
Else
   ' do something if value 43 is found
   ...
End If

nFirstIndex = bar.Labels.FindString("LabelToSearchFor")
If nFirstIndex = -1 Then
   ' do something if label is not found
   ...
Else
   ' do something if label is found
   ...
End If

The FindValue or FindString methods have two overloads, with which you can specify a start index from which the search must begin. The following example will find the indexes of all data items with value 12.

C#
Copy Code
int curIndex = bar.Values.FindValue(43);
ArrayList indexArray = new ArrayList();

while (curIndex != -1)
{
   indexArray.Add(curIndex);
   curIndex = bar.Values.FindValue(43, curIndex + 1);
}
Visual Basic
Copy Code
Dim curIndex As Integer =  bar.Values.FindValue(43)
Dim indexArray As ArrayList =  New ArrayList()

While curIndex <> -1
   indexArray.Add(curIndex)
   curIndex = bar.Values.FindValue(43, curIndex + 1)
End While
Related Examples
Windows forms: All Examples\Data Manipulation\General\Finding
See Also

 

 


©2017. Nevron Software LLC.

Send Feedback