Partilhar via


LinkEntity Class

 

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

Specifies the links between multiple entity types used in creating complex queries.

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

Inheritance Hierarchy

System.Object
  Microsoft.Xrm.Sdk.Query.LinkEntity

Syntax

[DataContractAttribute(Name = "LinkEntity", Namespace = "https://schemas.microsoft.com/xrm/2011/Contracts")]
public sealed class LinkEntity : IExtensibleDataObject
<DataContractAttribute(Name := "LinkEntity", Namespace := "https://schemas.microsoft.com/xrm/2011/Contracts")>
Public NotInheritable Class LinkEntity
    Implements IExtensibleDataObject

Constructors

Name Description
System_CAPS_pubmethod LinkEntity()

Initializes a new instance of the LinkEntity class.

System_CAPS_pubmethod LinkEntity(String, String, String, String, JoinOperator)

Initializes a new instance of the LinkEntity class setting the required properties.

Properties

Name Description
System_CAPS_pubproperty Columns

Gets or sets the column set.

System_CAPS_pubproperty EntityAlias

Gets or sets the alias for the entity.

System_CAPS_pubproperty ExtensionData

Gets or sets the structure that contains extra data.

System_CAPS_pubproperty JoinOperator

Gets or sets the join operator.

System_CAPS_pubproperty LinkCriteria

Gets or sets the complex condition and logical filter expressions that filter the results of the query.

System_CAPS_pubproperty LinkEntities

Gets the links between multiple entity types.

System_CAPS_pubproperty LinkFromAttributeName

Gets or sets the logical name of the attribute of the entity that you are linking from.

System_CAPS_pubproperty LinkFromEntityName

Gets or sets the logical name of the entity that you are linking from.

System_CAPS_pubproperty LinkToAttributeName

Gets or sets the logical name of the attribute of the entity that you are linking to.

System_CAPS_pubproperty LinkToEntityName

Gets or sets the logical name of the entity that you are linking to.

System_CAPS_pubproperty Orders

Methods

Name Description
System_CAPS_pubmethod AddLink(String, String, String)

Adds a link, setting the link to entity name, the link from attribute name and the link to attribute name.

System_CAPS_pubmethod AddLink(String, String, String, JoinOperator)

Adds a link setting the link to entity name, the link from attribute name, the link to attribute name, and the join operator.

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.)

Examples

q = new QueryExpression();
q.EntityName = "account";
q.ColumnSet = new ColumnSet();
q.ColumnSet.Columns.Add("name");

q.LinkEntities.Add(new LinkEntity("account", "contact", "primarycontactid", "contactid", JoinOperator.Inner));
q.LinkEntities[0].Columns.AddColumns("firstname", "lastname");
q.LinkEntities[0].EntityAlias = "temp";

q.Criteria = new FilterExpression();
q.Criteria.AddCondition("accountnumber", ConditionOperator.Equal, accountNumber);
q.Orders.Add(new OrderExpression("name", OrderType.Descending));
q.Distinct = true;
EntityCollection ec = this.Context.Proxy.RetrieveMultiple(q);

Log.Assert(ec.Entities.Count == 3, "Expected 3 entities, received {0}", ec.Entities.Count);
Log.Assert((string)ec.Entities[0]["name"] == "SdkAccount3", "First Entity should be SdkAccount3");
Log.Assert((string)ec.Entities[1]["name"] == "SdkAccount2", "First Entity should be SdkAccount2");
Log.Assert((string)ec.Entities[2]["name"] == "SdkAccount1", "First Entity should be SdkAccount1");
Log.Assert((string)((AliasedValue)ec.Entities[0]["temp.firstname"]).Value == (string)contact["firstname"], "Expected {0} Got {1}", contact["firstname"], ec.Entities[0]["temp.firstname"]);
Log.Assert((string)((AliasedValue)ec.Entities[1]["temp.lastname"]).Value == (string)contact["lastname"], "Expected {0} Got {1}", contact["lastname"], ec.Entities[1]["temp.lastname"]);

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

LinkEntities
Microsoft.Xrm.Sdk.Query Namespace

Return to top

Microsoft Dynamics 365

© 2016 Microsoft. All rights reserved. Copyright