Rdlc报表查看器表达式比较不起作用

Question

=SWITCH(Fields!DES.Value="ZERO","8pt",Fields!DES.Value="Head 1 Pin 1 - Hold Position - Last (mm)","3pt",Fields!DES.Value="Electrode Change","8pt",Fields!CP.Value < "1.33","8pt")

这是我的rdlc表达。第一部分工作正常，但在开关结束时：

Fields!CP.Value < "1.33","8pt"

不起作用。我已经尝试过“1,33”和1.33