WriteMetricValue Method

Writes a value to a Sparkplug metric with the specified metric name.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ExtensionAttribute()>
Public Shared Sub WriteMetricValue( _
   ByVal producer As ISparkplugProducer, _
   ByVal metricName As String, _
   ByVal value As Object _
)

'Usage
 
Dim producer As ISparkplugProducer
Dim metricName As String
Dim value As Object
 
ISparkplugProducerExtension.WriteMetricValue(producer, metricName, value)

[Extension()]
public static void WriteMetricValue( 
   ISparkplugProducer producer,
   string metricName,
   object value
)

[Extension()]
public:
static void WriteMetricValue( 
   ISparkplugProducer^ producer,
   String^ metricName,
   Object^ value
)

Parameters

producer: The Sparkplug producer that will perform the operation.
The value of this parameter cannot be null (Nothing in Visual Basic).
metricName: The Sparkplug metric name.
The value of this parameter cannot be null (Nothing in Visual Basic).
value: The value to write to the Sparkplug metric.
The value of this parameter can be null (Nothing in Visual Basic).

Exceptions

Exception Description

Exception	Description
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.InvalidOperationException	A method call was invalid for the object's current state. 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.
OpcLabs.EasySparkplug.OperationModel.SparkplugException	The Sparkplug operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause. This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

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.InvalidOperationException

A method call was invalid for the object's current state.

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.

OpcLabs.EasySparkplug.OperationModel.SparkplugException

The Sparkplug operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause.

This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

Remarks

The producer must be started when this method is called, otherwise an System.InvalidOperationException is thrown.

This method throws OpcLabs.EasySparkplug.OperationModel.SparkplugException if the write operation fails.

This is an extension method (info: C#, VB.NET). In languages that have support for extensions methods (such as C# and VB.NET), you can use the extension method as if it were a regular method on the object that is its first parameter. In other languages (such as with Python.NET), you will call the extension as a static method, and pass it the object on which it acts as its first parameter.

Sparkplug is a trademark of Eclipse Foundation, Inc. "MQTT" is a trademark of the OASIS Open standards consortium. Other related terms are trademarks of their respective owners. Any use of these terms on this site is for descriptive purposes only and does not imply any sponsorship, endorsement or affiliation.

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

ISparkplugProducerExtension Class
ISparkplugProducerExtension Members

Documentation Home, Send Feedback. Resources: Knowledge Base, Product Downloads. Technical support: Online Forums, FAQ.

Missing some example? Ask us for it on our Online Forums! You do not have to own a commercial license in order to use Online Forums, and we reply to every post.