Reporting services 为什么不'；在我的SSRS报告中将t null值转换为零

我有以下的表达：

=IIF(IsNothing(Fields!WellTestMeasLiqRate.Value) = true, 
     CDec(0), 
     IIf(Fields!WellTestMeasLiqRate.Value > 0,
         Fields!WellTestTotalGasRate.Value / Fields!WellTestMeasLiqRate.Value, 
         CDec(0)))

= Iif(  Fields!WellTestMeasLiqRate.Value <=0, Cdec(0),Fields!WellTestTotalGasRate.Value) 
/ 
Iif(  Fields!WellTestMeasLiqRate.Value <=0, Cdec(1),Fields!WellTestMeasLiqRate.Value)

但是，IsNothing子句似乎没有捕捉到空值，因此，当我生成报告时，此字段将返回#VALUE

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任何提示都将不胜感激

这类错误与SSRS表达评估有关

使用以下表达式：

=IIF(IsNothing(Fields!WellTestMeasLiqRate.Value) = true, 
     CDec(0), 
     IIf(Fields!WellTestMeasLiqRate.Value > 0,
         Fields!WellTestTotalGasRate.Value / Fields!WellTestMeasLiqRate.Value, 
         CDec(0)))

= Iif(  Fields!WellTestMeasLiqRate.Value <=0, Cdec(0),Fields!WellTestTotalGasRate.Value) 
/ 
Iif(  Fields!WellTestMeasLiqRate.Value <=0, Cdec(1),Fields!WellTestMeasLiqRate.Value)

---

=Iif（Fields！WellTestMeasLiqRate.ValueSSRS验证IFF表达式的两侧。因此，如果分母为0，则无论检查多少次，它都会给出#错误

您需要做的是在报表属性代码窗口中放置一个小函数

Public Function divide(Byval a As Decimal,Byval b As Decimal, Byval c As Decimal) As Decimal
'  Fix for divide by zero problem in VB
' calculates  a/b  and either returns result or c if b = 0 


if b = 0 then 
    return c 
else 
    return a/b 
end if 

end function 

然后使用此代码进行除法

这就是代码的调用方式

=code.divide(fields!numerator.value,Fields!denominator.Value,0.0)

报告是显示所有行的
#值
，还是仅显示空行？