ssrs-2008 - SSRS 表达式评估不起作用

Question

共享数据集返回两列：DaysEarly 和 NumberShipped。我想在表格中使用它来显示提前、准时和延迟的发货数量。数据如下所示：

DaysEarly   NumberShipped
3           123
2           234
1           254
0           542 -- On time shipments
-1          43
-2          13

该表使用此数据集。我有以下表达式：

-- Early kits
=IIf(Fields!DaysEarly.Value > 0, Sum(Fields!NumberOfKits.Value),Nothing)

-- On Time Kits
=IIf(Fields!DaysEarly.Value = 0, Sum(Fields!NumberOfKits.Value), Nothing)

-- Late Kits
=IIf(Fields!DaysEarly.Value < 0, Sum(Fields!NumberOfKits.Value), Nothing)

最后一个表达式对所有出货量求和。前两个返回以下消息：

The Value expression for the textrun...contains an error: 
The query returned now rows for the dataset. The expression 
therefore evaluates to null.

这样做的正确方法是什么？我正在根据上面的数据寻找这样的结果：

Early shipments:   611
On time shipments: 542
Late shipments:    56

Answer 1

你在正确的轨道上，你需要在表达式中移动IIf表达式Sum：

早期的：

=Sum(IIf(Fields!DaysEarly.Value > 0, Fields!NumberShipped.Value, Nothing))

准时：

=Sum(IIf(Fields!DaysEarly.Value = 0, Fields!NumberShipped.Value, Nothing))

晚的：

=Sum(IIf(Fields!DaysEarly.Value < 0, Fields!NumberShipped.Value, Nothing))