vb.net visual studios 2005. dealing with substring null issue?
consider… input1.Substring(0,5)
What I want to do is return a true or false boolean value if its null or not null….
If I input a string to input1 and the string is .. 4 or less characters….
this gives an unhandled exception… out of range blah blah…
But I want instead of it to crash… is to give me a true or false return.. like if input1.Substring(0,5) exists… not nulll..
or doesnt exist is null…
I know can use an if/then or a select case to just not pass
input1 to input1.Substring(0, 5) if input1.length < 5
But I was hoping there was another way.... What I was trying was...
If String.IsNullOrEmpty(input1.Substring(0, 5)) = True Then
Do this
Else
Do that
End If
the tooltip says it returns a boolean value if its null or not.
but it doesn't seem to be working exactly like how I took what it says.
and it just crashes for me when it gets to that evaluation.
I would appreciate any light shed on this subject. thank you.
This is the easiest way I can think to do this:
If input1 Is Nothing OrElse input1.Substring(0, Math.Min(5, input1.Length)).Trim = “” Then
return true
End If
This will return true if input1 is null or if the first 5 characters (assuming it has that many) are spaces. It first has to check if input1 is nothing since it can’t evaluate substring if it is. Then it does an OrElse so it input1 is nothing the second part doesn’t get evaluated. Finally it takes either the first 5 characters, or the entire string if it’s less the 5 characters, trims off white space and checks if it’s empty.
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