我正在尝试从新的 REST API 检索多个数据,但我遇到了一个奇怪的问题。如果我在集合上使用$expand则它不起作用。
请求是:
GET [Oranization URL]/api/data/v8.0/accounts?$expand=contact_customer_accounts HTTP/1.1
Accept: application/json
Content-Type: application/json; charset=utf-8
OData-MaxVersion: 4.0
OData-Version: 4.0
和回应:
{
"error": {
"code": "",
"message": "Expansion of navigation properties isn\u2019t supported on entity collections.",
"innererror": {
"message": "Expansion of navigation properties isn\u2019t supported on entity collections.",
"type": "Microsoft.Crm.CrmHttpException",
"stacktrace": " at Microsoft.Crm.Extensibility.OData.CrmODataUtilities.ThrowIfSelectClauseHasNavigationProperty(SelectExpandClause selectExpandClause, Boolean isCalledFromEntitySet)\r\n at Microsoft.Crm.Extensibility.OData.CrmODataServiceDataProvider.RetrieveEdmEntityCollection(CrmODataExecutionContext context, String entityCollectionName, ODataQueryOptions queryOptions)\r\n at Microsoft.Crm.Extensibility.OData.EntityController.GetEntitySetInternal(String entitySetName, String castEntityName, CrmODataExecutionContext context, CrmEdmEntityObjectCollection crmEdmEntityObjectCollection, ODataQueryOptions queryOptions)\r\n at Microsoft.Crm.Extensibility.OData.EntityController.GetEntitySet(String entitySetName)\r\n at lambda_method(Closure , Object , Object[] )\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"
}
}
}
但是,如果我对单个实体提出此请求,那么我会得到结果
[Organization URL]/api/data/v8.0/accounts(9761dd37-d1b6-e511-80d7-001dd8b71fde)?$expand=contact_customer_accounts
在以前的 CRM 版本(2011,2015)中,这可以完美运行。MS是否有可能删除此功能?实际上,oData 4.0 协议允许这种类型的查询
http://services.odata.org/v4/TripPinServiceRW/People?$expand=Trips
为什么MS不允许它?没有这个,新的 REST API 将毫无用处。