Reference

OpcMethodDelegateCommand Members

Type

OpcMethodDelegateCommand

Namespace

Opc.UaFx

Assembly

Opc.UaFx.Advanced.dll

Package

Opc.UaFx.Advanced v2.59.0

Constructors

OpcMethodDelegateCommand

3 overloads

Overload	Description
OpcMethodDelegateCommand(OpcMethodExecuteCallback)	Initializes a new instance of the OpcMethodDelegateCommand class using the executeCallback specified.
OpcMethodDelegateCommand(OpcMethodExecuteCallback, OpcMethodCanExecuteCallback)	Initializes a new instance of the OpcMethodDelegateCommand class using the executeCallback and canExecuteCallback specified.
OpcMethodDelegateCommand(OpcMethodExecuteCallback, OpcMethodCanExecuteCallback, OpcMethodCanExecuteCallback)	Initializes a new instance of the OpcMethodDelegateCommand class using the executeCallback, canExecuteCallback and canUserExecuteCallback specified.

OpcMethodDelegateCommand(OpcMethodExecuteCallback)

Initializes a new instance of the OpcMethodDelegateCommand class using the executeCallback specified.

public OpcMethodDelegateCommand(OpcMethodExecuteCallback executeCallback)

Public Sub New(executeCallback As OpcMethodExecuteCallback)

Parameters

Name	Type	Description
executeCallback	OpcMethodExecuteCallback	The OpcMethodExecuteCallback which is invoked whenever the method of this command is called.

Exceptions

Exception	Condition
ArgumentNullException	The executeCallback is a null reference (Nothing in Visual Basic).

OpcMethodDelegateCommand(OpcMethodExecuteCallback, OpcMethodCanExecuteCallback)

Initializes a new instance of the OpcMethodDelegateCommand class using the executeCallback and canExecuteCallback specified.

public OpcMethodDelegateCommand(
    OpcMethodExecuteCallback executeCallback,
    OpcMethodCanExecuteCallback canExecuteCallback)

Public Sub New(
    executeCallback As OpcMethodExecuteCallback,
    canExecuteCallback As OpcMethodCanExecuteCallback)

Parameters

Name	Type	Description
executeCallback	OpcMethodExecuteCallback	The OpcMethodExecuteCallback which is invoked whenever the canExecuteCallback evaluates to the value true as soon as the method of this command is called.
canExecuteCallback	OpcMethodCanExecuteCallback	The OpcMethodCanExecuteCallback which is used to evaluate whether the method of this command can be called in general and by the current user.

Exceptions

Exception	Condition
ArgumentNullException	The executeCallback or canExecuteCallback is a null reference (Nothing in Visual Basic).

OpcMethodDelegateCommand(OpcMethodExecuteCallback, OpcMethodCanExecuteCallback, OpcMethodCanExecuteCallback)

Initializes a new instance of the OpcMethodDelegateCommand class using the executeCallback, canExecuteCallback and canUserExecuteCallback specified.

public OpcMethodDelegateCommand(
    OpcMethodExecuteCallback executeCallback,
    OpcMethodCanExecuteCallback canExecuteCallback,
    OpcMethodCanExecuteCallback canUserExecuteCallback)

Public Sub New(
    executeCallback As OpcMethodExecuteCallback,
    canExecuteCallback As OpcMethodCanExecuteCallback,
    canUserExecuteCallback As OpcMethodCanExecuteCallback)

Parameters

Name	Type	Description
executeCallback	OpcMethodExecuteCallback	The OpcMethodExecuteCallback which is invoked whenever the canExecuteCallback and canUserExecuteCallback evaluate to the value true as soons as the method of this command is called.
canExecuteCallback	OpcMethodCanExecuteCallback	The OpcMethodCanExecuteCallback which is used to evaluate whether the method of this command can be called in general.
canUserExecuteCallback	OpcMethodCanExecuteCallback	The OpcMethodCanExecuteCallback which is used to evaluate whether the method of this command can be called by the current user.

Exceptions

Exception	Condition
ArgumentNullException	The executeCallback, canExecuteCallback or canUserExecuteCallback is a null reference (Nothing in Visual Basic).

Methods

CanExecute

Determines the value of the Executable attribute of the method (CanExecute) and therefore decides whether the Execute method can be called in general to execute the method implementation.

public bool CanExecute(OpcContext context)

Public Function CanExecute(context As OpcContext) As Boolean

Parameters

Name	Type	Description
context	OpcContext	The OpcReadAttributeValueContext in case there the Executable attribute is read or the OpcMethodContext in case there the method call is to be processed.

Returns

Boolean

The value true if the method can be called; otherwise the value false.

Implements

CanExecute

CanUserExecute

Determines the value of the UserExecutable attribute of the method (CanUserExecute) and therefore decides wether the Execute method can be called by the current user to execute the method implementation.

public bool CanUserExecute(OpcContext context)

Public Function CanUserExecute(context As OpcContext) As Boolean

Parameters

Name	Type	Description
context	OpcContext	The OpcReadAttributeValueContext in case there the UserExecutable attribute is read or the OpcMethodContext in case there the method call is to be processed.

Returns

Boolean

The value true if the method can be called; otherwise the value false.

Implements

CanUserExecute

Execute

Performs the tasks necessary to implement the logic associated with a specific method using the context and inputArguments specified.

public void Execute(
    OpcMethodContext context,
    IList<object> inputArguments,
    IList<object> outputArguments)

Public Sub Execute(
    context As OpcMethodContext,
    inputArguments As IList(Of Object),
    outputArguments As IList(Of Object))

Parameters

Name	Type	Description
context	OpcMethodContext	The OpcMethodContext which provides the contextual information required to execute the method.
inputArguments	IList<Object>	The generic list of object values to use / respect during the execution of the method.
outputArguments	IList<Object>	The generic list of object values to use for out, ref (in Visual Basic ByRef) and returned values.

Implements

Execute

Remarks

Any OPC UA related result information is to be set using the Result property of the context.

This method is (to be) only called after the call to CanExecute and CanUserExecute evaluates to the value true.