'Usage
Dim itemId As String Dim instance As New DAItemDescriptor(itemId)
Parameters
- itemId
- Contains OPC item identifier.
The value of this parameter cannot be
null
(Nothing
in Visual Basic).
The value of this parameter cannot be null
(Nothing
in Visual Basic).
'Usage
Dim itemId As String Dim instance As New DAItemDescriptor(itemId)
The value of this parameter cannot be null
(Nothing
in Visual Basic).
Exception | Description |
---|---|
System.ArgumentNullException |
A 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. |
In languages that support implicit conversions (such as C# or VB.NET), in many cases you do not have call this constructor explicitly. When indicated, a call to an available equivalent implicit conversion operator will be created by the compiler automatically.