Why am I getting 'Trim' is not declared with this VB.NET code?

Question

I am trying to get a VB.NET app to compile. Besides the "elephant in the room", I'm also getting 7 "'Trim' is not declared" errors on code like this:

...as well as one "'IsNothing' is not declared. It may be inaccessible due to its protection level." on this line:

If IsNothing(memberList) = False Then

I don't know VB, so there may be a simple solution to this, but I have no clue what the problems are.

Why don't you use the NET version of Trim? The one that is part of string class? addr.Trim() — Steve, Nov 30 '16 at 21:38
You might not have the `Microsoft.VisualBasic` namespace included. That might be the case since it also chokes on `IsNothing`. The cool kids use the NET counterparts — Ňɏssa Pøngjǣrdenlarp, Nov 30 '16 at 21:40

Steve · Accepted Answer · 2016-11-30T21:44:12.270

3

The Trim function requires a reference to Microsoft.VisualBasic from the assembly Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)

Usually is preferable to use the native Trim method from the string class and not add a reference to this assembly (mainly used to help porting old VB6 apps)

mail.CC.Add(addr.Trim())

Notice also that the string.Trim removes other whitespace characters as tabs while the Microsoft.VisualBasic function does not.

edited Nov 30 '16 at 21:44

answered Nov 30 '16 at 21:41

Steve

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Cool; that gets rid of those six errors; I still have the one for "IsNothing" and the old "Object Ref" one. But this answers my question, so I will mark it as an answer ASAP (in 8 minutes/1:50 PST). – B. Clay Shannon-B. Crow Raven Nov 30 '16 at 21:42
1

`IsNothing` ==> `Is Nothing` (not a function) @B.ClayShannon – Ňɏssa Pøngjǣrdenlarp Nov 30 '16 at 21:43
When I separate them with a space, it does prevent the earlier err msg, but it brings two new ones: Illegal call expression or index expression. -and: "Expression expected" – B. Clay Shannon-B. Crow Raven Nov 30 '16 at 21:47
1

`If memberList IsNot Nothing Then ...` @B.ClayShannon it is not a function – Ňɏssa Pøngjǣrdenlarp Nov 30 '16 at 21:48
@Plutonix: Yep, that last did it; I wonder why it ever worked...?!? I assume it did at one time, anyway... – B. Clay Shannon-B. Crow Raven Nov 30 '16 at 21:50
@B.ClayShannon If it used to have a ref to the VB namespace those legacy functions would work – Ňɏssa Pøngjǣrdenlarp Nov 30 '16 at 21:52

Hadi · Answer 2 · 2016-11-30T21:49:53.303

1

You have to use addr.Trim instead of Trim(addr)

Read more about Trim in this MSDN article

And you should use

If not memberList Is Nothing Then

Instead of

If IsNothing(memberList) = False Then

Or

You have to import Microsoft.VisualBasic namespace

edited Nov 30 '16 at 21:49

answered Nov 30 '16 at 21:43

Hadi

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score 1 · Answer 3 · answered Dec 01 '16 at 02:59

If you use the Left(), Mid(), and Right() string functions you might find it easier to convert those too:

Left(t, l) becomes t.Substring(0, l)

Mid(t, s, l) becomes t.Substring(s-1, l)

Right(t, l) becomes t.Substring(t.Length - l)

Often Left and Right are properties and stop you using the old VB string functions.

score 0 · Answer 4 · answered Nov 30 '16 at 21:42

0

String.Trim doesn't take a string parameter. It returns a new string in which all leading and trailing occurrences of a set of specified characters from the current String object are removed.

It should be...

 addr.Trim()

answered Nov 30 '16 at 21:42

Trevor

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Why am I getting 'Trim' is not declared with this VB.NET code?

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