OPC Studio User's Guide and Reference
UALdsDiscoveryQuery Class
Members 



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.Discovery Namespace : UALdsDiscoveryQuery Class
Specifies an OPC UA discovery query performed using a LDS or LDS-ME service.
Object Model
UALdsDiscoveryQuery ClassStringCollection Class
Syntax
'Declaration
 
<CLSCompliantAttribute(True)>
<ComDefaultInterfaceAttribute(OpcLabs.EasyOpc.UA.Discovery.ComTypes._UALdsDiscoveryQuery)>
<ComVisibleAttribute(False)>
<GuidAttribute("F0A453E6-0D0A-4042-926E-E9EB63AC34A9")>
<TypeConverterAttribute(System.ComponentModel.ExpandableObjectConverter)>
<ValueControlAttribute("OpcLabs.BaseLib.Forms.Common.ObjectSerializationControl, OpcLabs.BaseLibForms, Version=5.80.82.1, Culture=neutral, PublicKeyToken=6faddca41dacb409", 
   DefaultReadWrite=False, 
   Export=True, 
   PageId=10001)>
<SerializableAttribute()>
Public MustInherit Class UALdsDiscoveryQuery 
   Inherits UAApplicationDiscoveryQuery
   Implements LINQPad.ICustomMemberProvider, OpcLabs.BaseLib.ComTypes._Info, OpcLabs.BaseLib.ComTypes._Object2, OpcLabs.EasyOpc.UA.Discovery.ComTypes._UAApplicationDiscoveryQuery, OpcLabs.EasyOpc.UA.Discovery.ComTypes._UALdsDiscoveryQuery, System.ICloneable, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable 
'Usage
 
Dim instance As UALdsDiscoveryQuery
[CLSCompliant(true)]
[ComDefaultInterface(OpcLabs.EasyOpc.UA.Discovery.ComTypes._UALdsDiscoveryQuery)]
[ComVisible(false)]
[Guid("F0A453E6-0D0A-4042-926E-E9EB63AC34A9")]
[TypeConverter(System.ComponentModel.ExpandableObjectConverter)]
[ValueControl("OpcLabs.BaseLib.Forms.Common.ObjectSerializationControl, OpcLabs.BaseLibForms, Version=5.80.82.1, Culture=neutral, PublicKeyToken=6faddca41dacb409", 
   DefaultReadWrite=false, 
   Export=true, 
   PageId=10001)]
[Serializable()]
public abstract class UALdsDiscoveryQuery : UAApplicationDiscoveryQuery, LINQPad.ICustomMemberProvider, OpcLabs.BaseLib.ComTypes._Info, OpcLabs.BaseLib.ComTypes._Object2, OpcLabs.EasyOpc.UA.Discovery.ComTypes._UAApplicationDiscoveryQuery, OpcLabs.EasyOpc.UA.Discovery.ComTypes._UALdsDiscoveryQuery, System.ICloneable, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable  
[CLSCompliant(true)]
[ComDefaultInterface(OpcLabs.EasyOpc.UA.Discovery.ComTypes._UALdsDiscoveryQuery)]
[ComVisible(false)]
[Guid("F0A453E6-0D0A-4042-926E-E9EB63AC34A9")]
[TypeConverter(System.ComponentModel.ExpandableObjectConverter)]
[ValueControl("OpcLabs.BaseLib.Forms.Common.ObjectSerializationControl, OpcLabs.BaseLibForms, Version=5.80.82.1, Culture=neutral, PublicKeyToken=6faddca41dacb409", 
   DefaultReadWrite=false, 
   Export=true, 
   PageId=10001)]
[Serializable()]
public ref class UALdsDiscoveryQuery abstract : public UAApplicationDiscoveryQuery, LINQPad.ICustomMemberProvider, OpcLabs.BaseLib.ComTypes._Info, OpcLabs.BaseLib.ComTypes._Object2, OpcLabs.EasyOpc.UA.Discovery.ComTypes._UAApplicationDiscoveryQuery, OpcLabs.EasyOpc.UA.Discovery.ComTypes._UALdsDiscoveryQuery, System.ICloneable, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable  
Remarks

See also in Knowledge Base: Technical note-OPC UA Discovery in QuickOPC.

 

The various kinds of OPC UA discovery can be generalized into just one method, Discover. This method is given a discovery query argument (of UADiscoveryQuery type) that tells it the requirements for the discovery. The specific kinds of OPC UA discovery described earlier are, in fact, implemented by constructing the discovery query appropriately, and then calling the Discover method.

The UADiscoveryQuery type is an abstract class which is at the root of a structured class hierarchy, with several concrete subclasses:

This generalized discovery mechanism allows for flexibility both on the component and developer sides, and possible future expansion with other kinds of discovery, without a need to introduce new methods into the IEasyUAClient interface.

 

Inheritance Hierarchy

System.Object
   OpcLabs.BaseLib.Object2
      OpcLabs.BaseLib.Info
         OpcLabs.EasyOpc.UA.Discovery.UADiscoveryQuery
            OpcLabs.EasyOpc.UA.Discovery.UAApplicationDiscoveryQuery
               OpcLabs.EasyOpc.UA.Discovery.UALdsDiscoveryQuery
                  OpcLabs.EasyOpc.UA.Discovery.UALocalApplicationDiscoveryQuery
                  OpcLabs.EasyOpc.UA.Discovery.UANetworkServerDiscoveryQuery

Requirements

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

See Also