vbNullString [英] vbNullString
问题描述
什么是.NET等价物
Dim strTmp as string
如果strTmp = vbNullString
早些时候在错误的新闻组中发布了这个。
What''s the .NET equivalent
Dim strTmp as string
If strTmp=vbNullString
Posted this earlier in the wrong Newsgroup.
推荐答案
Lou写道:
Lou wrote:
什么这是.NET的等价物吗?
What''s the .NET equivalent?
Dim strTmp as string
如果strTmp = vbNullString
Dim strTmp as string
If strTmp = vbNullString
如上所述,我不确定你能做这个比较。
字符串是否可以包含database-y空值? (相对于正确的
没有?)
无论如何,一个物体可以,所以
昏暗o as Object _
= PotentiallyNullValueFromDB()
如果o是System.DBNull.Value那么
。 。 。
HTH,
Phill W.
As given, I''m not sure you can do this comparison.
Can a String hold a "database-y" null value? (As opposed to a proper
Nothing?)
Well anyway, an Object can, so
Dim o as Object _
= PotentiallyNullValueFromDB()
If o Is System.DBNull.Value Then
. . .
HTH,
Phill W.
Lou写道:
Lou wrote:
什么是.NET等价物
Dim strTmp as string
如果strTmp = vbNullString
之前在错误的新闻组中发布此内容。
What''s the .NET equivalent
Dim strTmp as string
If strTmp=vbNullString
Posted this earlier in the wrong Newsgroup.
String.Empty
-
G?ran Andersson
_____
http://www.guffa.com
Phill W.写道:
Phill W. wrote:
Lou写道:
Lou wrote:
>什么是.NET等价物?
>What''s the .NET equivalent?
> Dim strTmp as string
如果strTmp = vbNullString
>Dim strTmp as string
If strTmp = vbNullString
如上所述,我不确定你能做这个比较。
字符串是否可以包含database-y。空值? (相对于正确的
没有?)
无论如何,一个物体可以,所以
昏暗o as Object _
= PotentiallyNullValueFromDB()
如果o是System.DBNull.Value那么
。 。 。
HTH,
Phill W.
As given, I''m not sure you can do this comparison.
Can a String hold a "database-y" null value? (As opposed to a proper
Nothing?)
Well anyway, an Object can, so
Dim o as Object _
= PotentiallyNullValueFromDB()
If o Is System.DBNull.Value Then
. . .
HTH,
Phill W.
vbNullString不代表数据库null,它只是一个空字符串。
-
G?跑Andersson
_____
http://www.guffa.com
>
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