reporting-services - SSRS 表达式抛出#Error - 有什么原因吗？

Question

我是 SSRS 的新手这是我正在尝试的表达式，但它显示“#Error”我尝试了各种不同的东西，但仍然没有任何进展，任何猜测为什么会发生。

=IIF(Fields!MailMeans.Value = "M","METER",
  IIF(Fields!MailMeans.Value = "I","INDICIA",
    IIF(Fields!MailMeans.Value = "S","STAMPS",
        IIF(Fields!MailMeans.Value = "N","NO-MAIL","")
        )
    )
 )

Answer 1

尝试使用Switch而不是嵌套IIF

=Switch(Fields!MailMeans.Value = "M", "METER", 
        Fields!MailMeans.Value = "I", "INDICIA", 
        Fields!MailMeans.Value = "S", "STAMPS")

Answer 2

这也应该有效：

=Switch(Fields!MailMeans.Value = "M", "METER", Fields!MailMeans.Value = "I", "INDICIA", Fields!MailMeans.Value = "S", "STAMPS", Fields!MailMeans.Value = "N", "NO-MAIL", Fields!MailMeans.Value <> "M" AND Fields!MailMeans.Value <> "I" AND Fields!MailMeans.Value <> "S" AND Fields!MailMeans.Value <> "N", "")