IDataReaderExtension.IsAggregationField 方法

语法

声明
Function IsAggregationField ( _
    index As Integer _
) As Boolean
用法
Dim instance As IDataReaderExtension
Dim index As Integer
Dim returnValue As Boolean

returnValue = instance.IsAggregationField(index)

bool IsAggregationField(
    int index
)

bool IsAggregationField(
    int index
)

abstract IsAggregationField : 
        index:int -> bool 

function IsAggregationField(
    index : int
) : boolean

注释

The IsAggregationField method enables you to supply specific, aggregation information about your result set to the report server. Take, for instance, the following result set:

City          State          Sales
====================================
Seattle       WA             150.65
Seattle       (null)         150.65
Tacoma        WA              75.54
Tacoma        (null)          75.54
(null)        WA             226.19
Portland      OR             112.25
Portland      (null)         112.25
(null)        OR             112.25
(null)        (null)         338.44

The IsAggregationField method returns a Boolean value for each row indicating that the field at the current index is an aggregation field, that is, the field is used in aggregations. In the previous example, the fields at index 0 and index 1 for row one should return true. In contrast, field index 1 for row two should return false. For row nine, both field index 0 and 1 should return false. Field index 2, the Sales field, returns false for all rows.

请参阅

参考