Connectivity Software User's Guide and Reference
Constant<TValue>(SparkplugMetric,SparkplugData<TValue>) Method



OpcLabs.EasySparkplug Assembly > OpcLabs.EasySparkplug Namespace > SparkplugMetricExtension Class > Constant Method : Constant<TValue>(SparkplugMetric,SparkplugData<TValue>) Method
The type of the value of the Sparkplug metric.
The Sparkplug metric that will perform the operation.

The value of this parameter cannot be null (Nothing in Visual Basic).

The constant Sparkplug data that will be provided by the metric.

The value of this parameter cannot be null (Nothing in Visual Basic).

Makes a constant metric using generic-typed Sparkplug data object (typed value, timestamp).
Syntax
'Declaration
 
<ExtensionAttribute()>
<JetBrains.Annotations.NotNullAttribute()>
Public Overloads Shared Function Constant(Of TValue)( _
   ByVal metric As SparkplugMetric, _
   ByVal data As SparkplugData(Of TValue) _
) As SparkplugMetric
'Usage
 
Dim metric As SparkplugMetric
Dim data As SparkplugData(Of TValue)
Dim value As SparkplugMetric
 
value = SparkplugMetricExtension.Constant(Of TValue)(metric, data)
[Extension()]
[JetBrains.Annotations.NotNull()]
public static SparkplugMetric Constant<TValue>( 
   SparkplugMetric metric,
   SparkplugData<TValue> data
)
[Extension()]
[JetBrains.Annotations.NotNull()]
public:
static SparkplugMetric^ Constantgeneric<typename TValue>
( 
   SparkplugMetric^ metric,
   SparkplugData<TValue^>^ data
) 

Parameters

metric
The Sparkplug metric that will perform the operation.

The value of this parameter cannot be null (Nothing in Visual Basic).

data
The constant Sparkplug data that will be provided by the metric.

The value of this parameter cannot be null (Nothing in Visual Basic).

Type Parameters

TValue
The type of the value of the Sparkplug metric.

Return Value

Returns the metric, internally modified as defined by the method.

This method never returns null (Nothing in Visual Basic).

Exceptions
ExceptionDescription

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.

Remarks

This method overload infers the Sparkplug data type of the metric from the TValue type.

The metric is made read-only, and its minimum sampling interval is set to System.Threading.Timeout.Infinite, effectively disabling the sampling.

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.

 

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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