这个表达式总是打印#Error

Question

此表达式始终在我的报告上打印#Error

=IIF(ISNOTHING(Fields!f2.Value)," ", Fields!f2.Value* Fields!If3.Value)

Answer 1

无论测试值如何，始终会评估IIF的参数。让我们分解表达式，看看会发生什么。

P1 = ISNOTHING(Fields!f2.Value) // this gets evaluated and "True" is the value
P2 = Fields!f2.Value * Fields!If3.Value // this gets evaluated and throws an #Error
Result = IIF(P1," ",P2) // this never gets evaluated because an error is already thrown

试试这个：

=IIF(ISNOTHING(Fields!f2.Value)," ", IIF(ISNOTHING(Fields!f2.Value),0, Fields!f2.Value) * Fields!If3.Value)

在这种情况下，当f2为空时，会发生以下情况：

P1 = ISNOTHING(Fields!f2.Value) // this gets evaluated and "True" is the value
P2 = IIF(P1,0, Fields!f2.Value) // this gets evaluated and 0 is the value
P3 = P2 * Fields!If3.Value // this gets evaluated and 0 is the value
Result = IIF(P1, " ", P3) // this gets evaluated and " " is the result