Need to check for empty string, visual basic

Question

Can someone help me to write a code that checks if string is empty and returns null if its true?

I have this now:

If(Not IsNothing(role.ROLE_DESC),role.ROLE_DESC.ToString(),Nothing)

But it only checks if role_desc is null, but I need to also check if its value is not an empty string and if so, then return null.

try using string.IsNullOrEmpty function

taquion
– taquion

2017-01-09 12:34:29 +00:00
Commented Jan 9, 2017 at 12:34 — taquion
– taquion, Commented Jan 9, 2017 at 12:34
msdn.microsoft.com/es-es/library/… check this

taquion
– taquion

2017-01-09 12:35:34 +00:00
Commented Jan 9, 2017 at 12:35 — taquion
– taquion, Commented Jan 9, 2017 at 12:35

Cal.B · Accepted Answer · 2017-01-10 14:54:23Z

4

What taquion said, or IsNullOrWhiteSpace. Looks like:

If TypeOf role.ROLE_DESC Is String AndAlso String.IsNullOrEmpty(role.ROLE_DESC) OrElse String.IsNullOrWhiteSpace(role.ROLE_DESC) Then
    'It is empty or whitespace
Else
     'it isn't empty or whitespace
End If

edited Jan 10, 2017 at 14:54

answered Jan 9, 2017 at 12:36

Cal.B

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3 Comments

Tim Schmelter Over a year ago

Presumes that role.ROLE_DESC is a string, also, IsNullOrEmpty is a subset of IsNullOrWhiteSpace , so the first check is redundant

user1945782 Over a year ago

Almost there! Use AndAlso instead of splitting over two lines.

Cal.B Over a year ago

Ha, now that's just picky! You're not wrong though.

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