動作する次のコードがありますが、カスタム「プロジェクト」エンティティに関連付けられている「アカウント」エンティティを取得するためだけに複数のルックアップを実行していると思います。
初期結果セットをループせずに、入力する関連エンティティを指定することはできますか?
public IList<new_project> GetAssociatedProjectsByPostcode(string postcode)
{
FilterExpression filter = new FilterExpression();
filter.FilterOperator = LogicalOperator.And;
filter.AddCondition(new ConditionExpression("new_project_zippostalcode", ConditionOperator.Equal, postcode));
QueryExpression query = new QueryExpression();
query.EntityName = new_project.EntityLogicalName;
query.ColumnSet = new ColumnSet(true);
query.Criteria = filter;
OrganizationServiceCache serviceCache = new OrganizationServiceCache(MemoryCache.Default, base.CrmConnection);
using (CachedOrganizationService service = new CachedOrganizationService(CrmConnection, serviceCache))
using (XrmServiceContext xrmServiceContext = new XrmServiceContext(service))
{
//Run the query to return the project entities in a list
IList<new_project> projects = service.RetrieveMultiple(query)
.Entities
.Select(item => item.ToEntity<new_project>())
.ToList<new_project>();
//Define the relationships we want populated
Relationship accountRel = new Relationship("new_account_new_project");
//We cannot call load property with tracking turned on
xrmServiceContext.MergeOption = MergeOption.NoTracking;
//Loop through the original list and get our associations
foreach (new_project np in projects)
xrmServiceContext.LoadProperty(np, accountRel);
return projects;
}
}
ServiceContext で同等のものを作成することは可能ですか?
Select Project.Name, Account.Name
From Project
Join Account ON Account.Id = Project.AccountId
編集 ：
以下のJamesによって説明されているようにリンクエンティティを使用した後、プロジェクトとアカウントが1つのクエリに入力されたエンティティコレクションを生成する次のものがありますが、このフラットなデータセットを階層オブジェクト構造に転送することはできません.
public IList<new_project> GetAssociatedProjectsByPostcode(string postcode)
{
FilterExpression filter = new FilterExpression();
filter.FilterOperator = LogicalOperator.And;
filter.AddCondition(new ConditionExpression("new_project_zippostalcode", ConditionOperator.BeginsWith, PostcodeUtility.RegionFromPostcode(postcode)));
QueryExpression query = new QueryExpression();
query.EntityName = new_project.EntityLogicalName;
query.ColumnSet = new ColumnSet(true);
query.Criteria = filter;
query.LinkEntities.Add(new LinkEntity(new_project.EntityLogicalName, Account.EntityLogicalName, "new_associatedaccountid", "accountid", JoinOperator.Inner));
query.LinkEntities[0].Columns = new ColumnSet(true);
query.LinkEntities[0].EntityAlias = Account.EntityLogicalName;
OrganizationServiceCache serviceCache = new OrganizationServiceCache(MemoryCache.Default, base.CrmConnection);
using (CachedOrganizationService service = new CachedOrganizationService(CrmConnection, serviceCache))
using (XrmServiceContext xrmServiceContext = new XrmServiceContext(service))
{
EntityCollection ec = service.RetrieveMultiple(query);
//*****************************************************************
//The entity collection is now populated with the accounts but they
//are just additional key value pairs
//e.g. (String)((AliasedValue)ec[0]["account.name"]).Value;
//*****************************************************************
//Turn the entity collection into our class structure
IList<new_project> projects = ec.Entities
.Select(item => item.ToEntity<new_project>())
.ToList<new_project>();
return projects;
}
}