在Dynamics CRM中将RetrieveMultiple与FetchXML一起使用时，出现“ System.ServiceModel.FaultException`1”

Question

尝试从FetchXML查询获取结果时，始终出现上述错误。 任何帮助，将不胜感激。 该错误总是在行上发生：

    EntityCollection GetAllOpenActivitiesXML_result = service.RetrieveMultiple(fetched1);

这是其余的代码：

ITracingService tracingService = executionContext.GetExtension<ITracingService>();
IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();
IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

Entity opp = new Entity("opportunity");
opp.Id = context.PrimaryEntityId;

string GetAllOpenActivitiesXML = @"
<fetch distinct='false' mapping='logical' aggregate='true'> 
<entity name='activitypointer'>
     <attribute name='activityid' aggregate='count' alias='activityid'/>
          <filter type='and'>
                 <condition attribute='statecode' operator='eq' value='0' /> 
          </filter>
     <link-entity name='opportunity' from='opportunityid' to='regardingobjectid'>
          <filter type='and'>
                 <condition attribute='name' operator='eq' value='MyOpportunity' />
          </filter>
     </link-entity> 
 </entity> 
 </fetch>";

    try {
         FetchExpression fetched1 = new FetchExpression(GetAllOpenActivitiesXML);
        EntityCollection GetAllOpenActivitiesXML_result = service.RetrieveMultiple(fetched1);

             foreach (var c in GetAllOpenActivitiesXML_result.Entities)
             { 
              Int32 totalOpenActivities = (Int32)((AliasedValue)c["activityid"]).Value;
              opp["new_openactivities"] = totalOpenActivities;
              }
        }
    catch { 
           opp["new_openactivities"] = 0; 
          }

 service.Update(opp);

Answer 1

造成此问题的原因是，您使用字段名称作为别名，因此，如果更改别名，它将开始起作用：

<fetch distinct="false" mapping="logical" aggregate="true" >
  <entity name="activitypointer" >
    <attribute name="activityid" alias="activityid_count" aggregate="count" />
    <filter type="and" >
      <condition attribute="statecode" operator="eq" value="0" />
    </filter>
    <link-entity name="opportunity" from="opportunityid" to="regardingobjectid" >
      <filter type="and" >
        <condition attribute="name" operator="eq" value="MyOpportunity" />
      </filter>
    </link-entity>
  </entity>
</fetch>

另外，我不知道您使用的是哪个CRM版本，但是我很确定可以将该插件替换为汇总字段，因此请尝试一下！