Reference

OpcNodeHistory<T> Class

Namespace

Opc.UaFx.Server

Assembly

Opc.UaFx.Advanced.dll

Package

Opc.UaFx.Advanced v2.59.0

Members

OpcNodeHistory<T> Members

Represents a history of values kept in memory in ascending order of their timestamps, with at most one value per timestamp.

Syntax

public class OpcNodeHistory<T> where T : OpcHistoryValue

Public Class OpcNodeHistory(Of T As OpcHistoryValue)

Type parameters

Name	Description
T	The type of the values, OpcHistoryValue or a type derived from it.

Inheritance

Object → OpcNodeHistory<T>

Implements

• IEnumerable
• IEnumerable<T>

Remarks

The timestamp of a value is its Timestamp; for an OpcModifiedHistoryValue this is the time of its modification.

Constructors

Name	Description
OpcNodeHistory6 overloads	Initializes a new instance of the OpcNodeHistory<T> class whose Capacity is -1 (unlimited).

Properties

Name	Description
Capacity	Gets the maximum number of values the history keeps.
Count	Gets the number of values in the history.
EnableRaisingEvents	Gets or sets a value indicating whether the history raises the events Added, Removed and Replaced.
EndTime	Gets the latest timestamp of the values in the history.
StartTime	Gets the earliest timestamp of the values in the history.

Methods

Name	Description
Add	Adds the value specified to the history and raises the Added event.
AddRange2 overloads	Adds the values specified to the history and raises the Added event.
Clear	Removes all values from the history and raises the Removed event.
Contains2 overloads	Determines whether the history contains a value at the timestamp specified.
Enumerate3 overloads	Enumerates the values of the history in ascending order of their timestamps.
GetEnumerator	Returns an enumerator which iterates through the values of the history in ascending order of their timestamps.
OnAddedprotected · virtual	Raises the Added event using the specified event data.
OnRemovedprotected · virtual	Raises the Removed event using the specified event data.
OnReplacedprotected · virtual	Raises the Replaced event using the specified event data.
Remove	Removes the value specified from the history and raises the Removed event.
RemoveAt4 overloads	Removes the value at the index specified in the ascending order of the timestamps and raises the Removed event.
RemoveRange2 overloads
Replace	Replaces the value at the timestamp of the value specified with the value and raises the Replaced event.

Events

Name	Description
Added	Occurs after values have been added to the history.
Removed	Occurs after values have been removed from the history, also if a value has been removed because the history reached its Capacity.
Replaced	Occurs after a value of the history has been replaced.

Indexers

Name	Description
Item2 overloads	Gets or sets the value at the index specified in the ascending order of the timestamps.

Applies to

Package	Versions
Opc.UaFx.Advanced	v2.5–v2.59