Класс ExpressionNode

The ExpressionNode object represents a policy-based management expression node. The expression node describes part of an expression, such as a constant value, an operator, or a function.

Иерархия наследования

System. . :: . .Object
  Microsoft.SqlServer.Management.Dmf..::..ExpressionNode
    Microsoft.SqlServer.Management.Dmf. . :: . .ExpressionNodeAttribute
    Microsoft.SqlServer.Management.Dmf. . :: . .ExpressionNodeChildren
    Microsoft.SqlServer.Management.Dmf. . :: . .ExpressionNodeConstant

Пространство имен:  Microsoft.SqlServer.Management.Dmf
Сборка:  Microsoft.SqlServer.Dmf (в Microsoft.SqlServer.Dmf.dll)

Синтаксис

'Декларация
<StrongNameIdentityPermissionAttribute(SecurityAction.InheritanceDemand, PublicKey := "0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")> _
<StrongNameIdentityPermissionAttribute(SecurityAction.LinkDemand, PublicKey := "0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")> _
Public MustInherit Class ExpressionNode
'Применение
Dim instance As ExpressionNode

[StrongNameIdentityPermissionAttribute(SecurityAction.InheritanceDemand, PublicKey = "0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")]
[StrongNameIdentityPermissionAttribute(SecurityAction.LinkDemand, PublicKey = "0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")]
public abstract class ExpressionNode

[StrongNameIdentityPermissionAttribute(SecurityAction::InheritanceDemand, PublicKey = L"0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")]
[StrongNameIdentityPermissionAttribute(SecurityAction::LinkDemand, PublicKey = L"0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")]
public ref class ExpressionNode abstract

[<AbstractClassAttribute>]
[<StrongNameIdentityPermissionAttribute(SecurityAction.InheritanceDemand, PublicKey = "0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")>]
[<StrongNameIdentityPermissionAttribute(SecurityAction.LinkDemand, PublicKey = "0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")>]
type ExpressionNode =  class end

public abstract class ExpressionNode

Тип ExpressionNode обеспечивает доступ к следующим элементам.

Конструкторы

	Имя	Описание
	ExpressionNode	Initializes a new instance of the ExpressionNode class.

В начало

Свойства

	Имя	Описание
	LastEvaluationResult	Gets or sets the result of the last evaluation.
	Tag	Gets the tag text that is associated with the expression node.
	Type	Gets the type of expression node.
	TypeClass	Gets the class type when the expression node represents a constant value or a variable.

В начало

Методы

	Имя	Описание
	ConstructNode	Creates a new expression node.
	ConvertFromFilterNode(FilterNode)	Creates a new expression node by converting a filter node.
	ConvertFromFilterNode(FilterNode, Type)	Creates a new expression node by converting a filter node.
	ConvertFromString	Converts a type from a string value.
	ConvertToFilterNode	Creates a filter node by converting the expression node.
	ConvertToIntWithCheck	Converts the specified string to an integer.
	ConvertToString	Converts a type to a string value.
	DeepClone	Creates a copy of the referenced object. This includes all its properties.
	Deserialize(String)	Deserializes an expression node from a string.
	Deserialize(XmlReader)	Deserializes an expression node from an XML reader.
	DeserializeProperties	Deserializes the properties in the expression from an XML reader.
	DeserializeResult	Deserializes the property results in the expression from an XML reader.
	DeserializeWithResult	Deserializes the expression node from a text string.
	DoConvertToFilterNode	Allows the conversion of expression node to filter mode.
	DoEnumAttributes	Deserializes the expression node from a list of text strings.
	EnumChildren	Returns an enumerated list of dependent expression nodes.
	EqualProperties	Determines whether the properties of the specified object are equal to the properties of the current expression node.
	Equals	Returns a Boolean value that specifies whether the referenced expression node object is equal to the specified object. (Переопределяет Object. . :: . .Equals(Object).)
	Evaluate(FacetEvaluationContext)	Evaluates the expression node with the given facet context.
	Evaluate(FacetEvaluationContext, Boolean)	Evaluates the expression node with the given facet context and checks the script as a proxy.
	Finalize	(Производный от Object.)
	GetHashCode	Gets the hash code for the object. (Переопределяет Object. . :: . .GetHashCode() () () ().)
	GetResult	Gets the result that is returned when an expression is deserialized.
	GetResultString	Gets the result in string format that is returned when an expression is deserialized.
	GetType	(Производный от Object.)
	MatchType< (Of < <' (T> ) > > )	Indicates the type of match to be used in the node.
	MemberwiseClone	(Производный от Object.)
	MoveToElementWithCheck	Moves the reader to the element with check.
	Parse(String)	Parses the specified expression string.
	Parse(String, Type)	Parses the specified string.
	ReadElementWithCheck	Reads a named serialized element using the XML Reader and returns the value.
	ReadEndElement	Reads the end element in the expression node.
	ReadNodeWithCheck	Reads the specified node with a checkmark.
	ReadSimpleNodeWithCheck	Reads the specified elements, evaluated with the given expression node type, and read with the specified XML reader.
	ReadWithCheck	Reads the expression node using the XML Reader.
	ResolveEnum	Resolves the enumeration conflicts encountered during the process.
	Serialize	Serializes the expression node to the specified XML Writer.
	SerializeNode	Serializes the expression node to a text string.
	SerializeNodeWithResult	Serializes the expression node to a text string.
	SerializeProperties	Serializes the properties in the expression to an XML writer.
	SerializeResult	Serializes the result in the expression node.
	SetFilterNodeCompatible	Sets the compatible filter node of the Boolean property.
	SetHasScript	Sets the Boolean value for the HasScript property.
	SetNameConditionType	Sets the name of the condition type property.
	SetNodeType	Indicates the type of node to be set.
	SetObjectName	Sets the name of the expression node.
	SetProperties	Sets property values.
	SetTypeClass	Sets type class for the expression node.
	ToString	Returns the referenced object in string format. (Переопределяет Object. . :: . .ToString() () () ().)
	ToStringForDisplay	Returns the referenced object in string format for display.
	ToStringForUrn	Returns the referenced object in URN format.

В начало

Замечания

The expression node represents the conditional state that is applied to the facet. For example, if the facet is Database Mail, then the expression could be "is installed" or "is not installed". There are different types of expression that are individually represented using the Type()()()() property and each of these are represented in more detail with specific types, such as ExpressionNodeFunction or ExpressionNodeConstant.

Using the ExpressionNode object you can:

• Create, modify, or delete an expression node that applies to the facet on a target object.

• Parse the expression string to create a valid expression for the facet.

Безопасность многопоточности

Любые открытые статический (Shared в Visual Basic) элементы этого типа потокобезопасны. Потокобезопасность с элементами экземпляров не гарантируется.

См. также

Справочник

Пространство имен Microsoft.SqlServer.Management.Dmf