OPC Studio User's Guide and Reference
HasProperty Method (DAItemPropertyRecord)



OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.DataAccess.Extensions Namespace > DAItemPropertyRecord Class : HasProperty Method
The Id of OPC property to be queried.

Because the OpcLabs.EasyOpc.DataAccess.DAPropertyId has an implicit conversion from System.Int64 and OpcLabs.EasyOpc.DataAccess.DAPropertyIds, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a long integer (representing the numerical value of the access rights), or an element of the OpcLabs.EasyOpc.DataAccess.DAPropertyIds enumeration in place of this parameter, and the corresponding Property Id specification will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the DAPropertyId Constructor(Int64) or DAPropertyId Constructor(DAPropertyIds) constructor instead.

The value of this parameter cannot be null (Nothing in Visual Basic).

Determines whether a specified OPC property is contained in this structure.
Syntax
'Declaration
 
Public Function HasProperty( _
   ByVal propertyId As DAPropertyId _
) As Boolean
'Usage
 
Dim instance As DAItemPropertyRecord
Dim propertyId As DAPropertyId
Dim value As Boolean
 
value = instance.HasProperty(propertyId)
public bool HasProperty( 
   DAPropertyId propertyId
)
public:
bool HasProperty( 
   DAPropertyId^ propertyId
) 

Parameters

propertyId
The Id of OPC property to be queried.

Because the OpcLabs.EasyOpc.DataAccess.DAPropertyId has an implicit conversion from System.Int64 and OpcLabs.EasyOpc.DataAccess.DAPropertyIds, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a long integer (representing the numerical value of the access rights), or an element of the OpcLabs.EasyOpc.DataAccess.DAPropertyIds enumeration in place of this parameter, and the corresponding Property Id specification will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the DAPropertyId Constructor(Int64) or DAPropertyId Constructor(DAPropertyIds) constructor instead.

The value of this parameter cannot be null (Nothing in Visual Basic).

Return Value

True if the structure contains the OPC property specified, otherwise false.
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