类型转换函数

常用:

val(expression)             转换为数值类型

CDate(expression)         转换为日期

CDbl(expression)          转换为小数

CInt(expression)          转换为整数

CLng(expression)           转换为长整数

字符串转换为日期时间
        Dim aDateString, aTimeString As String
        Dim aDate, aTime As Date
 
        aDateString = "2/12/2002"
        aTimeString = "4:35:47 PM"
       
aDate = CDate(aDateString)

        aTime = CDate(aTimeString)

其他类型转换为字符串
        Dim aDouble As Double
        Dim aString As String
        aDouble = 437.324

        aString = CStr(aDouble)

类型通用转换函数:CType(expression, typename)

expression ：任何有效的表达式。如果 expression 的值超出 typename 允许的范围，Visual Basic 将引发异常。
typename ：任何在 Dim 语句的 As 子句内合法的表达式，即任何数据类型、对象、结构、类或接口的名称。
        Dim aDate As Date = #2/12/1969 12:00:01 AM#
        Dim s As String = CType(aDate, String)

        Dim s As String = "1/2/2009"
        Dim d As Date = CType(s, Date)

n   其他:了解

CBool(expression),CByte(expression),CChar(expression),CDec(expression),CObj(expression),CSByte(expression),CShort(expression),CSng(expression),CStr(expression),CUInt(expression),CULng(expression),CUShort(expression)