| 作用 | 关键字 |
| 数据类型变换。 | CBool, CByte, CCur, CDate, CDbl, CDec, CInt, CLng, CSng, CStr, CVar, CVErr, Fix, Int |
| 设置数据类型。 | Boolean, Byte, Currency, Date, Double, Integer, Long, Object, Single, String, Variant (default) |
| 检查数据类型。 | IsArray, IsDate, IsEmpty, IsError, IsMissing, IsNull, IsNumeric, IsObject |