Connectivity Software User's Guide and Reference
ConstantValue(SparkplugMetric,Type,Object) Method



OpcLabs.EasySparkplug Assembly > OpcLabs.EasySparkplug Namespace > SparkplugMetricExtension Class > ConstantValue Method : ConstantValue(SparkplugMetric,Type,Object) Method
The Sparkplug metric that will perform the operation.

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

The type of the Sparkplug metric, expressed as .NET System.Type.

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

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

The value of this parameter can be null (Nothing in Visual Basic).

Makes a constant metric with given value type and value.
Syntax
'Declaration
 
<ExtensionAttribute()>
<JetBrains.Annotations.NotNullAttribute()>
Public Overloads Shared Function ConstantValue( _
   ByVal metric As SparkplugMetric, _
   ByVal valueType As Type, _
   ByVal value As Object _
) As SparkplugMetric
'Usage
 
Dim metric As SparkplugMetric
Dim valueType As Type
Dim value As Object
Dim value As SparkplugMetric
 
value = SparkplugMetricExtension.ConstantValue(metric, valueType, value)
[Extension()]
[JetBrains.Annotations.NotNull()]
public static SparkplugMetric ConstantValue( 
   SparkplugMetric metric,
   Type valueType,
   object value
)
[Extension()]
[JetBrains.Annotations.NotNull()]
public:
static SparkplugMetric^ ConstantValue( 
   SparkplugMetric^ metric,
   Type^ valueType,
   Object^ value
) 

Parameters

metric
The Sparkplug metric that will perform the operation.

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

valueType
The type of the Sparkplug metric, expressed as .NET System.Type.

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

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

The value of this parameter can be null (Nothing in Visual Basic).

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

The metric will not be writable.

The timestamp will be the current time of this method call.

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