UADataValue Class

A class that stores the value, together with status code and timestamps.

Object Model

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ComDefaultInterfaceAttribute(OpcLabs.EasyOpc.UA.ComTypes._UADataValue)>
<ComVisibleAttribute(True)>
<GuidAttribute("F0AA1082-1B20-4661-865B-A5BDC32D2C29")>
<TypeConverterAttribute(System.ComponentModel.ExpandableObjectConverter)>
<CLSCompliantAttribute(True)>
<ValueControlAttribute("OpcLabs.BaseLib.Forms.Common.ObjectSerializationControl, OpcLabs.BaseLibForms, Version=5.81.455.1, Culture=neutral, PublicKeyToken=6faddca41dacb409", 
   DefaultReadWrite=False, 
   Export=True, 
   PageId=10001)>
<SerializableAttribute()>
Public Class UADataValue 
   Inherits OpcLabs.BaseLib.Info
   Implements LINQPad.ICustomMemberProvider, OpcLabs.BaseLib.ComTypes._Info, OpcLabs.BaseLib.ComTypes._Object2, OpcLabs.EasyOpc.UA.ComTypes._UADataValue, System.ICloneable, System.IFormattable, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

'Usage
 
Dim instance As UADataValue

[ComDefaultInterface(OpcLabs.EasyOpc.UA.ComTypes._UADataValue)]
[ComVisible(true)]
[Guid("F0AA1082-1B20-4661-865B-A5BDC32D2C29")]
[TypeConverter(System.ComponentModel.ExpandableObjectConverter)]
[CLSCompliant(true)]
[ValueControl("OpcLabs.BaseLib.Forms.Common.ObjectSerializationControl, OpcLabs.BaseLibForms, Version=5.81.455.1, Culture=neutral, PublicKeyToken=6faddca41dacb409", 
   DefaultReadWrite=false, 
   Export=true, 
   PageId=10001)]
[Serializable()]
public class UADataValue : OpcLabs.BaseLib.Info, LINQPad.ICustomMemberProvider, OpcLabs.BaseLib.ComTypes._Info, OpcLabs.BaseLib.ComTypes._Object2, OpcLabs.EasyOpc.UA.ComTypes._UADataValue, System.ICloneable, System.IFormattable, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

[ComDefaultInterface(OpcLabs.EasyOpc.UA.ComTypes._UADataValue)]
[ComVisible(true)]
[Guid("F0AA1082-1B20-4661-865B-A5BDC32D2C29")]
[TypeConverter(System.ComponentModel.ExpandableObjectConverter)]
[CLSCompliant(true)]
[ValueControl("OpcLabs.BaseLib.Forms.Common.ObjectSerializationControl, OpcLabs.BaseLibForms, Version=5.81.455.1, Culture=neutral, PublicKeyToken=6faddca41dacb409", 
   DefaultReadWrite=false, 
   Export=true, 
   PageId=10001)]
[Serializable()]
public ref class UADataValue : public OpcLabs.BaseLib.Info, LINQPad.ICustomMemberProvider, OpcLabs.BaseLib.ComTypes._Info, OpcLabs.BaseLib.ComTypes._Object2, OpcLabs.EasyOpc.UA.ComTypes._UADataValue, System.ICloneable, System.IFormattable, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

Remarks

The UADataValue class is a fundamental part of the OPC UA data model, encapsulating not just the data value but also information about the value. This includes the status code, which provides information about the quality of the value (e.g., whether it is good, uncertain, or bad), and timestamps that indicate when the value was generated by the data source and when it was received by the server.

This class is used extensively in OPC UA to communicate data values between clients and servers.

Inheritance Hierarchy

System.Object
   OpcLabs.BaseLib.Object2
      OpcLabs.BaseLib.Info
         OpcLabs.EasyOpc.UA.UADataValue
            OpcLabs.EasyOpc.UA.PubSub.UADataSetFieldData
            OpcLabs.EasyOpc.UA.UAAttributeData

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

UADataValue Members
OpcLabs.EasyOpc.UA Namespace

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