'Declaration
 
<ExtensionAttribute()>
<ElementsNotNullAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function ReadMultipleItems( _
   ByVal client As IEasyDAClient, _
   ByVal itemArgumentsArray() As DAItemArguments, _
   ByVal readParameters As DAReadParameters _
) As DAVtqResult()

'Usage
 
Dim client As IEasyDAClient
Dim itemArgumentsArray() As DAItemArguments
Dim readParameters As DAReadParameters
Dim value() As DAVtqResult
 
value = IEasyDAClientExtension.ReadMultipleItems(client, itemArgumentsArray, readParameters)

[Extension()]
[ElementsNotNull()]
[NotNull()]
public static DAVtqResult[] ReadMultipleItems( 
   IEasyDAClient client,
   DAItemArguments[] itemArgumentsArray,
   DAReadParameters readParameters
)

[Extension()]
[ElementsNotNull()]
[NotNull()]
public:
static array<DAVtqResult^>^ ReadMultipleItems( 
   IEasyDAClient^ client,
   array<DAItemArguments^>^ itemArgumentsArray,
   DAReadParameters^ readParameters
) 

Parameters

client

The client object that will perform the operation.

itemArgumentsArray

Array of item arguments objects (determine the OPC server and an OPC-DA item).

readParameters

The read parameters (such as data source or value age).

Return Value

The servers can be local or can be remotely accessed via DCOM. Optionally, an access path can be specified or a specific data type can be requested.

The ReadMultipleItems method only waits for the first update from the server (or until the timeout elapses) for each item; it does not wait until the quality becomes "uncertain" or "good". The function performs all individual operations in parallel, but only returns after all individual operations are completed (or their timeouts elapse).

This method does not throw an exception in case of OPC operation failures. Instead, the eventual exception related to each item is returned in Exception property of each returned OpcLabs.EasyOpc.DataAccess.OperationModel.DAVtqResult element.

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2012, Windows Server 2016; .NET Core, .NET 5, .NET 6: Linux, macOS, Microsoft Windows

Reference

IEasyDAClientExtension Class
IEasyDAClientExtension Members
Overload List