'Declaration
<ExtensionAttribute()> <CanBeNullAttribute()> Public Overloads Shared Function ReadValue( _ ByVal client As IEasyUAClient, _ ByVal nodeArguments As UANodeArguments, _ ByVal readParameters As UAReadParameters _ ) As Object
'Usage
Dim client As IEasyUAClient Dim nodeArguments As UANodeArguments Dim readParameters As UAReadParameters Dim value As Object value = IEasyUAClientExtension.ReadValue(client, nodeArguments, readParameters)
[Extension()] [CanBeNull()] public static object ReadValue( IEasyUAClient client, UANodeArguments nodeArguments, UAReadParameters readParameters )
[Extension()] [CanBeNull()] public: static Object^ ReadValue( IEasyUAClient^ client, UANodeArguments^ nodeArguments, UAReadParameters^ readParameters )
Parameters
- client
- The client object that will perform the operation.
This is typically the EasyUAClient object.
The value of this parameter cannot be
null
(Nothing
in Visual Basic). - nodeArguments
- An object that specifies the node in the OPC server.
The value of this parameter cannot be
null
(Nothing
in Visual Basic). - readParameters
- Read parameters, such as the maximum age of the value.
Because the UAReadParameters has implicit conversions from System.Double and OpcLabs.EasyOpc.UA.AddressSpace.UAQualifiedName, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a double precision floating point number (representing the maximum value age in milliseconds), or an OPC UA qualified name (representing the name of the encoding to be used) in place of this parameter, and the corresponding OPC UA read parameters will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the UAReadParameters.FromDouble or UAReadParameters.FromUAQualifiedName static method instead.
The value of this parameter cannot be
null
(Nothing
in Visual Basic).
Return Value
This method can return null
(Nothing
in Visual Basic).