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Clase 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.

Espacio de nombres:  Microsoft.SqlServer.Management.Dmf
Ensamblado:  Microsoft.SqlServer.Dmf (en Microsoft.SqlServer.Dmf.dll)

Sintaxis

'Declaración
<StrongNameIdentityPermissionAttribute(SecurityAction.InheritanceDemand, PublicKey := "0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")> _
<StrongNameIdentityPermissionAttribute(SecurityAction.LinkDemand, PublicKey := "0024000004800000940000000602000000240000525341310004000001000100272736ad6e5f9586bac2d531eabc3acc666c2f8ec879fa94f8f7b0327d2ff2ed523448f83c3d5c5dd2dfc7bc99c5286b2c125117bf5cbe242b9d41750732b2bdffe649c6efb8e5526d526fdd130095ecdb7bf210809c6cdad8824faa9ac0310ac3cba2aa0523567b2dfa7fe250b30facbd62d4ec99b94ac47c7d3b28f1f6e4c8")> _
Public MustInherit Class ExpressionNode
'Uso
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

El tipo ExpressionNode expone los siguientes miembros.

Constructores

  Nombre Descripción
Método protegido ExpressionNode Initializes a new instance of the ExpressionNode class.

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Propiedades

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

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Métodos

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

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Comentarios

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.

Seguridad para subprocesos

Cualquier miembro público static (Shared en Visual Basic) de este tipo es seguro para subprocesos. No se garantiza que los miembros de instancia sean seguros para subprocesos.