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Classe 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.

Namespace:  Microsoft.SqlServer.Management.Dmf
Assembly:  Microsoft.SqlServer.Dmf (em Microsoft.SqlServer.Dmf.dll)

Sintaxe

'Declaração
<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

O tipo ExpressionNode expõe os membros a seguir.

Construtores

  Nome Descrição
Método protegido ExpressionNode Initializes a new instance of the ExpressionNode class.

Início

Propriedades

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

Início

Métodos

  Nome Descrição
Método públicoMembro estático ConstructNode Creates a new expression node.
Método públicoMembro estático ConvertFromFilterNode(FilterNode) Creates a new expression node by converting a filter node.
Método públicoMembro estático ConvertFromFilterNode(FilterNode, Type) Creates a new expression node by converting a filter node.
Método protegidoMembro estático ConvertFromString Converts a type from a string value.
Método público ConvertToFilterNode Creates a filter node by converting the expression node.
Método protegidoMembro estático ConvertToIntWithCheck Converts the specified string to an integer.
Método protegidoMembro 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 públicoMembro estático Deserialize(String) Deserializes an expression node from a string.
Método públicoMembro 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 públicoMembro 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. (Substitui 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 (Herdado de Object.)
Método público GetHashCode Gets the hash code for the object. (Substitui 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 (Herdado de Object.)
Método públicoMembro estático MatchType< (Of < <' (T> ) > > ) Indicates the type of match to be used in the node.
Método protegido MemberwiseClone (Herdado de Object.)
Método protegidoMembro estático MoveToElementWithCheck Moves the reader to the element with check.
Método públicoMembro estático Parse(String) Parses the specified expression string.
Método públicoMembro estático Parse(String, Type) Parses the specified string.
Método protegidoMembro 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 protegidoMembro estático ReadNodeWithCheck Reads the specified node with a checkmark.
Método protegidoMembro estático ReadSimpleNodeWithCheck Reads the specified elements, evaluated with the given expression node type, and read with the specified XML reader.
Método protegidoMembro estático ReadWithCheck Reads the expression node using the XML Reader.
Método protegidoMembro estático ResolveEnum Resolves the enumeration conflicts encountered during the process.
Método público Serialize Serializes the expression node to the specified XML Writer.
Método públicoMembro estático SerializeNode Serializes the expression node to a text string.
Método públicoMembro 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. (Substitui Object. . :: . .ToString() () () ().)
Método público ToStringForDisplay Returns the referenced object in string format for display.
Método público ToStringForUrn Returns the referenced object in URN format.

Início

Comentários

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.

Segurança de thread

Qualquer membro público static (Shared no Visual Basic) desse tipo é seguro para threads. Não há garantia de que qualquer membro de instância seja seguro para threads.

Consulte também

Referência

Namespace Microsoft.SqlServer.Management.Dmf