通过本文主要向大家介绍了vb.net crc校验程序,vb.net 截取字符串,vb.net 字符串函数,vb.net 字符串转数字,vb.net 字符串等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
VB.NET校验字符串是否是日期
'Validate for a date
Shared Function checkdate(ByVal thisvalue As String) As String
If Not IsDate(thisvalue) Then
checkdate = "NULL"
Else
checkdate = "'" & thisvalue & "'"
End If
Return checkdate
End Function ' END checkdate
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VB.NET检查字符串是否是数字
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'Used to submit values to the database, check for empty value, replace w/ "NULL"
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Shared Function checkNumber(ByVal thisvalue As String) As String
If IsDBNull(thisvalue) Or Len(thisvalue) = 0 Or Not IsNumeric(thisvalue) Then
checkNumber = "NULL"
Else
checkNumber = thisvalue
End If
Return checkNumber
End Function ' END checkNumber
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