Implementing a LINQ stored procedure returns multiple result sets

Have been bothered by the return of multiple results from a LINQ stored procedure, overtime tonight, problem solving, sharing ideas:

LINQ stored procedures generated by default code is Isingleresult, that is, can only return a result set, we first move the hands, change it to imultipleresults. Entity classes are changed according to different circumstances.

Before the LINQ stored procedure changes:

[Function(Name="dbo.MeterTaskStat")]
public　ISingleResult<XXXX>　MeterTaskStat
([Parameter(Name="MeterTaskType",　DbType="Int")]
　 System.Nullable<int>　meterTaskType,
[Parameter(Name="StartDate",　DbType="DateTime")]
　 System.Nullable<System.DateTime>　startDate,
　 [Parameter(Name="EndDate",　DbType="DateTime")]
System.Nullable<System.DateTime>　endDate)
{
　 IExecuteResult　result　=
this.ExecuteMethodCall(this,　((MethodInfo)(MethodInfo.GetCurrentMethod())),
　 meterTaskType,　startDate,　endDate);
　 return　((ISingleResult<XXXXXX>)(result.ReturnValue));
}

After the LINQ stored procedure has changed:

[Function(Name="dbo.MeterTaskStat")]
[ResultType(typeof(TaskStatData))]
public　IMultipleResults　MeterTaskStat
([Parameter(Name　=　"MeterTaskType",　DbType　=　"Int")]
System.Nullable<int>　meterTaskType,
[Parameter(Name　=　"StartDate",　DbType　=　"DateTime")]
　 System.Nullable　startDate,
[Parameter(Name　=　"EndDate",　DbType　=　"DateTime")]
　 System.Nullable　endDate)
{
　 IExecuteResult　result　=
this.ExecuteMethodCall
(this,　((MethodInfo)(MethodInfo.GetCurrentMethod())),
meterTaskType,　startDate,　endDate);
return　((IMultipleResults)(result.ReturnValue));
}