Have there any function to check the null and empty at once

  • Thread starter Thread starter ad
  • Start date Start date
A

ad

I have a string like string sNo.
I want to cast it to int with int.Parse(sNo)
but if the string is null or empty, it will thow exception.

I must check if sNo is not null and is not empty before cast like:
if ((sNo<>null) && (sNo<>""))

Have there any function to check the null and "" at once
 
ad said:
I have a string like string sNo.
I want to cast it to int with int.Parse(sNo)
but if the string is null or empty, it will thow exception.

I must check if sNo is not null and is not empty before cast like:
if ((sNo<>null) && (sNo<>""))

Have there any function to check the null and "" at once
Click to expand...

Prior to .NET 2.0, you must provide your own solution.
In .NET 2.0, there's String.IsNullOrEmpty().

Cheers,
 
ad said:
I have a string like string sNo.
I want to cast it to int with int.Parse(sNo)
but if the string is null or empty, it will thow exception.

I must check if sNo is not null and is not empty before cast like:
if ((sNo<>null) && (sNo<>""))

Have there any function to check the null and "" at once
Click to expand...

Well, first of all, it's
if ((sNo != null) && (sNo != "")

as <> is a syntax error. Also, there's not much sense is checking if a
string is less than "", since it can't be. I prefer
if ( sNo != null && sNo.Length > 0)
but that's just me.

As Joerg pointed out, in .Net 2.0 is could use:
if (String.IsNullOrEmpty(sNo))
But, let's no much less typing what you've got now. Ultimately, the problem
is that we really want to write :

if (sNo.IsNullorEmpty())

but there is no way to get that to work is sNo is null.
 
Back
Top