Initializes a new instance of the class. Initializes a new instance of the class, with the OPC server specified by machine name and server class, the OPC item specified by its ItemId and data type, and a value age.
Syntax
'Declaration
Public Function New( _
ByVal As String, _
ByVal As String, _
ByVal As String, _
ByVal As VarType, _
ByVal As Integer _
)
'Usage
Dim machineName As String
Dim serverClass As String
Dim itemId As String
Dim dataType As VarType
Dim valueAge As Integer
Dim instance As New DAReadItemArguments(machineName, serverClass, itemId, dataType, valueAge)
public DAReadItemArguments(
string ,
string ,
string ,
VarType ,
int
)
public:
DAReadItemArguments(
String^ ,
String^ ,
String^ ,
VarType^ ,
int
)
Parameters
- machineName
- Name of the machine. Determines the computer on which the OPC server is located. May be an empty string, in which case the OPC server is assumed to exist on the local computer or at the computer specified for it by DCOM configuration.
- serverClass
- Contains ProgID of the OPC server.
- itemId
- Contains OPC item identifier.
- dataType
- Specifies the data type requested. Passing OpcLabs.BaseLib.ComInterop.VarTypes.Empty means that the server's canonical data type should be used.
- valueAge
- Determines the age of value you would like to obtain (in milliseconds).
Exceptions
| Exception | Description |
|---|
| System.ArgumentException |
One of the arguments provided to a method is not valid.
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. |
| System.ArgumentNullException |
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. |
| System.ArgumentOutOfRangeException |
The value of an argument is outside the allowable range of values as defined by the invoked method.
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
