ValueExpressionAttributeBase Class

Represents a base attribute class for C# expressions that when evaluated will specify a new value for a property.

Inheritance Hierarchy

SystemObject
  SystemAttribute
    GSF.ComponentModelValueExpressionAttributeBase
      GSF.ComponentModelDefaultValueExpressionAttribute
      GSF.ComponentModelTypeConvertedValueExpressionAttribute
      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 abstract class ValueExpressionAttributeBase : Attribute, 
	IValueExpressionAttribute

<AttributeUsageAttribute(AttributeTargets.Property)>
Public MustInherit Class ValueExpressionAttributeBase
	Inherits Attribute
	Implements IValueExpressionAttribute

[AttributeUsageAttribute(AttributeTargets::Property)]
public ref class ValueExpressionAttributeBase abstract : public Attribute, 
	IValueExpressionAttribute

[<AbstractClassAttribute>]
[<AttributeUsageAttribute(AttributeTargets.Property)>]
type ValueExpressionAttributeBase = 
    class
        inherit Attribute
        interface IValueExpressionAttribute
    end

GSF.ComponentModel.ValueExpressionAttributeBase = function();

Type.createClass(
	'GSF.ComponentModel.ValueExpressionAttributeBase',
	Attribute,
	GSF.ComponentModel.IValueExpressionAttribute);

View Source

The ValueExpressionAttributeBase type exposes the following members.

Constructors

	Name	Description
	ValueExpressionAttributeBase	Creates a new ValueExpressionAttributeBase

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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.
	EvaluationOrder	Gets or sets the numeric evaluation order for this expression. Defaults to zero.
	Expression	Gets C# expression that will evaluate to the desired value.
	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.

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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)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object)
	GetExpressionUpdateValue	Gets the modeled property based value used to update the Expression.
	GetHashCode	Returns the hash code for this instance. (Inherited from Attribute)
	GetPropertyUpdateValue	Gets the Expression based value used to update a modeled property.
	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)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object)
	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