Question

我正在将Crystal报告转换为MS报告。我在Crystal报告中的表达是这样的：

=IIF(Fields!foo.Value Is Nothing and Fields!bar.Value Is Nothing,
0,
IIF(Fields!foo.Value Is Not Nothing and Fields!bar.Value Is Nothing,
Fields!foo.Value,
IIF(Fields!foo.Value Is Nothing and Fields!bar.Value Is Not Nothing,
Fields!bar.Value * -1,
IIF(Fields!foo.Value Is Not Nothing and Fields!bar.Value Is Not Nothing,
Fields!foo.Value,
0
))))

Not在这里不起作用，即使文字是蓝色的。

我可以使用Not或!之类的内容吗？或者我必须对IsNothing()

感到茫然

Answer 1

哦，我想通了，我只需要将Not移到表达式的开头。这是我的VB.NET语法错误。来自C＃，VB.NET和MS Reports对我来说都是新手，对不起。

=IIF(Fields!foo.Value Is Nothing and Fields!bar.Value Is Nothing,
0,
IIF(Not Fields!foo.Value Is Nothing and Fields!bar.Value Is Nothing,
Fields!foo.Value,
IIF(Fields!foo.Value Is Nothing and Not Fields!bar.Value Is Nothing,
Fields!bar.Value * -1,
IIF(Not Fields!foo.Value Is Nothing and Not Fields!bar.Value Is Nothing,
Fields!foo.Value,
0
))))

Answer 2

您应该能够将表达简化为：

IIF(Not Fields!foo.Value Is Nothing, 
    Fields!foo.Value,
    IIF(Not Fields!bar.Value Is Nothing,
        Fields!bar.Value * -1,
        0))

编辑：要返回foo.Value - bar.Value，当两者都不为null时，请尝试：

= IIF(Not Fields!foo.Value Is Nothing, Fields!foo.Value, 0) -
  IIF(Not Fields!bar.Value Is Nothing, Fields!bar.Value, 0)

Answer 3

试试这个：

=IIF((Fields!foo.Value.Equals(System.DBNull.Value)), "YES", "NO")
=IIF((Fields!foo.Value is System.DBNull.Value), "YES", "NO")

如何轻松否定MS报告中的表达？

3 个答案: