超出允许的嵌套层次是怎么回事

[熊熊和兔兔了啦]

SELECT 学生
nrec=RECNO()
DO CASE
CASE num = 0
ThisForm.Command1.Enabled= .F.
ThisForm.Command2.Enabled= .F.
ThisForm.Command3.Enabled= .F.
CASE ntop = nbottom
ThisForm.Command1.Enabled= .F.
ThisForm.Command2.Enabled= .F.
CASE nrec = ntop
Thisform.Command1.Enabled= .F.
Thisform.Command2.Enabled= .T.
CASE nrec = nbottom
Thisform.Command1.Enabled= .T.
Thisform.Command2.Enabled= .F.
OTHERWISE
Thisform.Command1.Enabled= .T.
Thisform.Command2.Enabled= .T.
ENDCASE
ss =IIF( num=0," ",IIF (学生.性别, "男","女") ) 运行时错误 显示在这一行说函数参数的类型，值或数目无效
ThisForm.Refresh
还有想问下超出允许的嵌套层次是怎么回事？

[都市夜猫]

应该是字段类型不对 改成 ss =IIF(num=0," ",IIF(1=学生.性别, "男","女")) 试试 超出允许的嵌套层次，可能是一个过程或方法递归调用自己，但退出递归的条件设置有误

[lc_apple]

ss =IIF( num=0," ",IIF (学生.性别, "男","女") ) "学生.性别"不是逻辑型的吧

[十豆三]

应该是 学生.性别 类型不是逻辑型