UpdateValueExpressionAttribute Class

Defines a C# expression attribute that when evaluated will specify an updated value for a property.

Inheritance Hierarchy

SystemObject
  SystemAttribute
    GSF.ComponentModelValueExpressionAttributeBase
      GSF.ComponentModelUpdateValueExpressionAttribute

Namespace: GSF.ComponentModel
Assembly: GSF.Core (in GSF.Core.dll) Version: 2.4.218-beta+101eee949414e414795e55a6e73d88938f0177b8

Syntax

C++

JavaScript

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[AttributeUsageAttribute(AttributeTargets.Property)]
public sealed class UpdateValueExpressionAttribute : ValueExpressionAttributeBase

<AttributeUsageAttribute(AttributeTargets.Property)>
Public NotInheritable Class UpdateValueExpressionAttribute
	Inherits ValueExpressionAttributeBase

[AttributeUsageAttribute(AttributeTargets::Property)]
public ref class UpdateValueExpressionAttribute sealed : public ValueExpressionAttributeBase

[<SealedAttribute>]
[<AttributeUsageAttribute(AttributeTargets.Property)>]
type UpdateValueExpressionAttribute = 
    class
        inherit ValueExpressionAttributeBase
    end

GSF.ComponentModel.UpdateValueExpressionAttribute = function();

Type.createClass(
	'GSF.ComponentModel.UpdateValueExpressionAttribute',
	GSF.ComponentModel.ValueExpressionAttributeBase);

View Source

The UpdateValueExpressionAttribute type exposes the following members.

Constructors

	Name	Description
	UpdateValueExpressionAttribute	Creates a new UpdateValueExpressionAttribute

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Properties

	Name	Description
	Cached	Gets or sets value that determines if value should be cached after first evaluation. Defaults to false. (Inherited from ValueExpressionAttributeBase)
	EvaluationOrder	Gets or sets the numeric evaluation order for this expression. Defaults to zero. (Inherited from ValueExpressionAttributeBase)
	Expression	Gets C# expression that will evaluate to the desired value. (Inherited from ValueExpressionAttributeBase)
	TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)
	TypeRegistry	Gets or sets any TypeRegistry to use if the attribute Expression needs to be pre-parsed. (Inherited from ValueExpressionAttributeBase)

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Methods

	Name	Description
	Equals	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
	GetExpressionUpdateValue	Gets the modeled property based value used to update the Expression. (Inherited from ValueExpressionAttributeBase)
	GetHashCode	Returns the hash code for this instance. (Inherited from Attribute)
	GetPropertyUpdateValue	Gets the Expression based value used to update a modeled property. (Inherited from ValueExpressionAttributeBase)
	GetType	Gets the Type of the current instance. (Inherited from Object)
	IsDefaultAttribute	When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute)
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute)
	ToString	Returns a string that represents the current object. (Inherited from Object)

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Extension Methods

	Name	Description
	GetEnumValueOrDefault	Gets the enumeration constant for value, if defined in the enumeration, or a default value. (Defined by EnumExtensions)
	GetEnumValueOrDefaultT	Gets the enumeration constant for this value, if defined in the enumeration, or a default value. (Defined by EnumExtensions)

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Reference

GSF.ComponentModel Namespace