Classe EntityQueryExpression

Articolo
12/03/2014

Si applica a: CRM 2015 on-prem, CRM Online

Defines a complex query to retrieve entity metadata.

Spazio dei nomi: Microsoft.Xrm.Sdk.Metadata.Query
Assembly: Microsoft.Xrm.Sdk (in Microsoft.Xrm.Sdk.dll)

Sintassi

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

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

Note

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);

}

Gerarchia ereditarietà

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

Thread Safety

Tutti i membri statici pubblici (Shared in Visual Basic) di questo tipo sono thread-safe. Non è garantito che i membri di istanza siano thread-safe.

Piattaforme

Piattaforme di sviluppo

Windows Vista, Windows Server 2003 e

Piattaforme di destinazione

Windows 98,Windows 2000,Windows 2000 Server,Windows CE,Windows Server 2008,Windows 98 Second Edition,Pocket PC,Smartphone,Windows Server 2003,Windows XP Professional,Windows Vista,Windows XP

Change History

Vedere anche

Riferimento

Membri EntityQueryExpression
Spazio dei nomi Microsoft.Xrm.Sdk.Metadata.Query

Altre risorse

Query and Capture Changes to Metadata
Sample: Query Metadata and Detect Changes

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