OPC Studio User's Guide and Reference
TryGetFieldValue Method (_UAEventData)



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.ComTypes Namespace > _UAEventData Interface : TryGetFieldValue Method
Attribute field to look up in the event data.
The value found, or a null reference if the attribute field has not been found.
Attempts to retrieve a value of specified field from the event data.
Syntax
'Declaration
 
Function TryGetFieldValue( _
   ByVal attributeField As Object, _
   ByRef value As Object _
) As Boolean
'Usage
 
Dim instance As _UAEventData
Dim attributeField As Object
Dim value As Object
Dim value As Boolean
 
value = instance.TryGetFieldValue(attributeField, value)
bool TryGetFieldValue( 
   object attributeField,
   out object value
)
bool TryGetFieldValue( 
   Object^ attributeField,
   [Out] Object^ value
) 

Parameters

attributeField
Attribute field to look up in the event data.
value
The value found, or a null reference if the attribute field has not been found.

Return Value

Returns true if the attribute field has been found; false otherwise.
Exceptions
ExceptionDescription

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

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