如何在 vb.net 中分配非空条件？
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how to assign not null condition in vb.net?
提问by NarasimhaKolla
i am working on windows8 vb.net mobile application in that application i am checking not null conditions.here below i have attaching the code file.
我正在该应用程序中处理 windows8 vb.net 移动应用程序，我正在检查非空条件。下面我附上了代码文件。
If JobEventAllDetailsSortnew.Item(value).EventText() IsNot Nothing _
And JobEventAllDetailsSortnew.Item(value).ReasonCodeDesc() IsNot Nothing Then
mEventNotes = "Event text: " + JobEventAllDetailsSortnew.Item(value).EventText() + _
"\nReason: " + JobEventAllDetailsSortnew.Item(value).ReasonCodeDesc()
ElseIf JobEventAllDetailsSortnew.Item(value).EventText().Trim() IsNot Nothing Then
mEventNotes = "Event text: " + JobEventAllDetailsSortnew.Item(value).EventText()
Else
mEventNotes = JobEventAllDetailsSortnew.Item(value).EventText().Trim() + _
"\n" + JobEventAllDetailsSortnew.Item(value).ReasonCodeDesc().Trim()
End If
Please give me any suggestion how to write not null conditions in vb.net?
请给我任何建议如何在 vb.net 中编写非空条件？
回答by ZeroBased_IX
You can do it a few ways, you could do:
你可以通过几种方式做到这一点，你可以这样做：
Value <> Nothing
Or
或者
If Not String.IsNullOrEmpty(JobEventAllDetailsSortnew.Item(value).EventText())
End If
To name a couple of ways.
列举几种方式。
http://msdn.microsoft.com/en-us/library/system.string.isnullorempty(v=vs.110).aspx
http://msdn.microsoft.com/en-us/library/system.string.isnullorempty(v=vs.110).aspx
