AF SDK Reference

AFSearch.FrequencyDistribution Method

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AFSearch.FrequencyDistribution Method

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Last UpdatedNov 18, 2025
3 minute read

Generates a frequency distribution for the specified items.

Namespace: OSIsoft.AF.Search
Assembly: OSIsoft.AFSDK (in OSIsoft.AFSDK.dll) Version: 3.1.1.1182

Syntax

public AFGroupedResult<Object> FrequencyDistribution(
	string groupedField
)

Public Function FrequencyDistribution ( 
	groupedField As String
) As AFGroupedResult(Of Object)

Dim instance As AFSearch
Dim groupedField As String
Dim returnValue As AFGroupedResult(Of Object)

returnValue = instance.FrequencyDistribution(groupedField)

public:
AFGroupedResult<Object^>^ FrequencyDistribution(
	String^ groupedField
)

member FrequencyDistribution : 
        groupedField : string -> AFGroupedResult<Object>

Parameters

groupedField: Type: SystemString
The field whose value should be grouped.

Return Value

Type: AFGroupedResultObject
A result containing the requested frequency distribution or an error if the summaries could not be performed.

Examples

// Get the Database
PISystems myPISystems = new PISystems();
PISystem myPISystem = myPISystems.DefaultPISystem;
if (myPISystem == null)
    throw new InvalidOperationException("Default PISystem was not found.");
AFDatabase myDB = myPISystem.Databases[dbName];
if (myDB == null)
    throw new InvalidOperationException("Database was not found.");

// Create a search to find all the event frames created from the 'Event'
// template in the last year.
using (AFEventFrameSearch eventSearch = new AFEventFrameSearch(myDB, "EventFrameSearch", @"Template:'Event' Start:>'t-1y'"))
{
    eventSearch.CacheTimeout = TimeSpan.FromMinutes(10);
    // Generate a frequency distribution by primary element
    AFGroupedResult<object> frequencyDistribution = eventSearch.FrequencyDistribution("Element");
    foreach (var group in frequencyDistribution.GroupedResults)
    {
        Console.WriteLine("Element: {0}, Count: {1}",
            group.Key, group.Value[AFSummaryTypes.Count]);
    }
}

' Get the Database
Dim myPISystems As New PISystems()
Dim myPISystem As PISystem = myPISystems.DefaultPISystem
If myPISystem Is Nothing Then
    Throw New InvalidOperationException("Default PISystem was not found.")
End If
Dim myDB As AFDatabase = myPISystem.Databases(dbName)
If myDB Is Nothing Then
    Throw New InvalidOperationException("Database was not found.")
End If

' Create a search to find all the event frames created from the 'Event'
' template in the last year.
Using eventSearch As New AFEventFrameSearch(myDB, "EventFrameSearch", "Template:'Event' Start:>'t-1y'")
    eventSearch.CacheTimeout = TimeSpan.FromMinutes(10)


    ' Generate a frequency distribution by primary element
    Dim frequencyDistribution As AFGroupedResult(Of Object) = eventSearch.FrequencyDistribution("Element")
    For Each group As KeyValuePair(Of Object, IReadOnlyDictionary(Of AFSummaryTypes, AFValue)) In frequencyDistribution.GroupedResults
        Console.WriteLine("Element: {0}, Count: {1}", group.Key, group.Value(AFSummaryTypes.Count))
    Next

End Using

No code example is currently available or this language may not be supported.

Version Information

AFSDK

Supported in: 3.1.1, 3.1.0, 3.0.2, 3.0.1, 3.0.0, 2.10.11, 2.10.5, 2.10.0, 2.10, 2.9.5, 2.9

AF SDK Reference