Reference

OpcModifiedNodeHistory Class

since v2.59

Namespace

Opc.UaFx.Server

Assembly

Opc.UaFx.Advanced.dll

Package

Opc.UaFx.Advanced v2.59.0

Members

OpcModifiedNodeHistory Members

Represents the modified history of a node: the values which have been inserted, replaced, updated or deleted, each together with the information about its modification.

Syntax

public class OpcModifiedNodeHistory

Public Class OpcModifiedNodeHistory

Inheritance

Object → OpcModifiedNodeHistory

Implements

• IEnumerable
• IEnumerable<OpcModifiedHistoryValue>

Remarks

The values are sorted by the timestamp of the value (its ServerTimestamp or, if not set, its SourceTimestamp), not by the Timestamp, which is the modification time. A timestamp occurs once per modification of the value at that time. Values with the same timestamp are sorted from the most recent to the oldest modification, and values with the same modification time in the order in which they have been added.

Constructors

Name	Description
OpcModifiedNodeHistory4 overloads	Initializes a new instance of the OpcModifiedNodeHistory 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 its events.
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.
AddRange2 overloads	Adds the values specified to the history.
Clear	Removes all values from the history.
Contains	Determines whether the history contains a value with the timestamp specified.
Enumerate3 overloads	Gets the values of the history in their sort order.
GetEnumerator	Returns an enumerator which iterates through the values of the history.
GetValues	Gets the values with the timestamp specified.
OnAddedprotected · virtual	Raises the Added event.
OnRemovedprotected · virtual	Raises the Removed event.
RemoveAt	Removes the value at the index specified.
RemoveRange2 overloads	Removes the values whose timestamp is not earlier than the startTime specified.

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.

Indexers

Name	Description
Item	Gets the value at the index specified.

Applies to

Package	Versions
Opc.UaFx.Advanced	v2.59