EntityQueryExpression Class

 

Applies To: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2016, Dynamics CRM Online

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

Constructors

Name Description
System_CAPS_pubmethod EntityQueryExpression()

Initializes a new instance of the EntityQueryExpression class.

Properties

Name Description
System_CAPS_pubproperty AttributeQuery

Gets or sets a query expression for the entity attribute metadata to return.

System_CAPS_pubproperty Criteria

Gets or sets the filter criteria for the metadata query.(Inherited from MetadataQueryExpression.)

System_CAPS_pubproperty ExtensionData

Gets or sets the structure that contains extra data.(Inherited from MetadataQueryBase.)

System_CAPS_pubproperty KeyQuery

System_CAPS_pubproperty LabelQuery

Gets or sets a query expression for the labels to return.

System_CAPS_pubproperty Properties

Gets or sets the properties to be returned by the query.(Inherited from MetadataQueryExpression.)

System_CAPS_pubproperty RelationshipQuery

Gets or sets a query expression for the entity relationship metadata to return.

Methods

Name Description
System_CAPS_pubmethod Equals(Object)

(Inherited from Object.)

System_CAPS_pubmethod GetHashCode()

(Inherited from Object.)

System_CAPS_pubmethod GetType()

(Inherited from Object.)

System_CAPS_pubmethod 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.

See Also

Microsoft.Xrm.Sdk.Metadata.Query Namespace
Retrieve and detect changes to metadata
Sample: Query metadata and detect changes

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