LinkEntity 類別

發行項
07/17/2015

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

命名空間: Microsoft.Xrm.Sdk.Query
組件: Microsoft.Xrm.Sdk (在 Microsoft.Xrm.Sdk.dll 中)

語法

'宣告
<DataContractAttribute(Name:="LinkEntity", Namespace:="https://schemas.microsoft.com/xrm/2011/Contracts")> _
Public NotInheritable Class LinkEntity
    Implements IExtensibleDataObject

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

範例

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"]);

繼承階層

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

執行緒安全

此類型的任何公用靜態 (Visual Basic 中的 Shared) 成員都具備執行緒安全。任何執行個體成員都不保證具備執行緒安全。

平台

Development Platforms

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

Target Platforms

Windows Server 2008、Windows Server 2012、Windows 7

Change History

請參閱

參照

LinkEntity 成員
 Microsoft.Xrm.Sdk.Query 命名空間
 LinkEntities

共用方式為