If Not String.Empty ignoring empty string - VB.NET

Question

I have a array of strings and I am looping through them, but the string might be empty so I am trying this:

For Each Component As String In Components
    If Component IsNot String.Empty Then
        'Work your magic
    End If
Next

But if Component is an empty string the logic still fires. I've also tried

If Component <> "" Then 

End If

With the same results. So what am I missing?

Just adding for completeness: your assumption that Component is empty string must have been false. It was either a non-empty string, or Nothing. — jeroenh
– jeroenh, Commented Aug 11, 2010 at 19:33

Daniel May · Accepted Answer · 2010-08-11 18:04:05Z

25

Make sure that your List is of type string

Use the String.IsNullOrEmpty method.

Sub Main
    Dim foo As String
    foo = "Non-Empty string"
    If Not String.IsNullOrEmpty(foo) Then
        Console.WriteLine("Foo is not empty.")
    End If
End Sub

answered Aug 11, 2010 at 18:04

Daniel May

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Comments

Wade73 · Accepted Answer · 2010-08-11 18:07:26Z

1

One thing that has gotten me before is spaces. You can't see it when you view the variable in the watch window, but it makes the string not empty or null.

answered Aug 11, 2010 at 18:07

Wade73

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1 Comment

personaelit Over a year ago

That wasn't it, but +1 for the tip.

Matt · Accepted Answer · 2010-08-11 18:05:09Z

0

Do your string have default values and are they actually ""? What if you used:

If Not Component Is Nothing Then

End If

answered Aug 11, 2010 at 18:05

Matt

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