EntityQueryExpression Class

Artikkeli
10/20/2016

Applies To: Dynamics CRM 2015

Defines a complex query to retrieve entity metadata.

Namespace: Microsoft.Xrm.Sdk.Metadata.Query
Assembly: Microsoft.Xrm.Sdk (in Microsoft.Xrm.Sdk.dll)

Inheritance Hierarchy

System.Object
Microsoft.Xrm.Sdk.Metadata.Query.MetadataQueryBase
Microsoft.Xrm.Sdk.Metadata.Query.MetadataQueryExpression
Microsoft.Xrm.Sdk.Metadata.Query.EntityQueryExpression

Syntax

[DataContractAttribute(Name = "EntityQueryExpression", Namespace = "https://schemas.microsoft.com/xrm/2011/Metadata/Query")]
public sealed class EntityQueryExpression : MetadataQueryExpression

[DataContractAttribute(Name = "EntityQueryExpression", Namespace = "https://schemas.microsoft.com/xrm/2011/Metadata/Query")]
public ref class EntityQueryExpression sealed : MetadataQueryExpression

[<Sealed>]
[<DataContractAttribute(Name = "EntityQueryExpression", Namespace = "https://schemas.microsoft.com/xrm/2011/Metadata/Query")>]
type EntityQueryExpression = 
    class
        inherit MetadataQueryExpression
    end

<DataContractAttribute(Name := "EntityQueryExpression", Namespace := "https://schemas.microsoft.com/xrm/2011/Metadata/Query")>
Public NotInheritable Class EntityQueryExpression
    Inherits MetadataQueryExpression

Constructors

	Name	Description
	EntityQueryExpression()	Initializes a new instance of the EntityQueryExpression class.

Properties

	Name	Description
	AttributeQuery	Gets or sets a query expression for the entity attribute metadata to return.
	Criteria	Gets or sets the filter criteria for the metadata query.(Inherited from MetadataQueryExpression.)
	ExtensionData	Gets or sets the structure that contains extra data.(Inherited from MetadataQueryBase.)
	LabelQuery	Gets or sets a query expression for the labels to return.
	Properties	Gets or sets the properties to be returned by the query.(Inherited from MetadataQueryExpression.)
	RelationshipQuery	Gets or sets a query expression for the entity relationship metadata to return.

Methods

	Name	Description
	Equals(Object)	(Inherited from Object.)
	GetHashCode()	(Inherited from Object.)
	GetType()	(Inherited from Object.)
	ToString()	(Inherited from Object.)

Remarks

The following example shows the use of an EntityQueryExpression to retrieve entity metadata.


//An entity query expression to combine the filter expressions and property expressions for the query.
EntityQueryExpression entityQueryExpression = new EntityQueryExpression()
{

 Criteria = EntityFilter,
 Properties = EntityProperties,
 AttributeQuery = new AttributeQueryExpression()
 {
  Criteria = AttributeFilter,
  Properties = AttributeProperties
 },
 LabelQuery = labelQuery

};

//Retrieve the metadata for the query without a ClientVersionStamp
RetrieveMetadataChangesResponse initialRequest = getMetadataChanges(entityQueryExpression, null, DeletedMetadataFilters.OptionSet);


protected RetrieveMetadataChangesResponse getMetadataChanges(
 EntityQueryExpression entityQueryExpression,
 String clientVersionStamp,
 DeletedMetadataFilters deletedMetadataFilter)
{
 RetrieveMetadataChangesRequest retrieveMetadataChangesRequest = new RetrieveMetadataChangesRequest()
 {
  Query = entityQueryExpression,
  ClientVersionStamp = clientVersionStamp,
  DeletedMetadataFilters = deletedMetadataFilter
 };

 return (RetrieveMetadataChangesResponse)_service.Execute(retrieveMetadataChangesRequest);

}

Thread Safety

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Jaa