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Posted 17 May 2010

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.NET 4: string.IsNullOrWhitespace()

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4.68/5 (17 votes)
17 May 2010CPOL
Any string input can have these many possible states1) String is null2) String is empty3) String contains nothing but white space4) String has some contentTill now, .NET had static method for stringbool string.IsNullOrEmpty()which handled first two conditions for...
Any string input can have these many possible states
1) String is null
2) String is empty
3) String contains nothing but white space
4) String has some content

Till now, .NET had static method for string
C#
bool string.IsNullOrEmpty(<string_val>)

which handled first two conditions for us.

Now with .NET 4 we have another static method
C#
bool string.IsNullOrWhitespace(<string_val>)


Basically it is equivalent to the following code,
C#
return String.IsNullOrEmpty(input) || input.Trim().Length ==0 ;


but has performance improvement because white-space characters are defined by the Unicode standard. The IsNullOrWhiteSpace method interprets any character that returns a value of true when it is passed to the Char.IsWhiteSpace method as a white-space character.

We must have implemented logic for this condition everywhere in our applications but addition of this useful inbuilt function is nice to have with some performance improvement !

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Sarang Date
Technical Lead Microsoft India R&D Pvt. Ltd. Hyderabad
India India
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Comments and Discussions

 
GeneralMy vote of 5 Pin
soulprovidergr17-Sep-12 0:15
Membersoulprovidergr17-Sep-12 0:15 
GeneralAwesome Pin
Mico Perez6-Aug-10 10:20
MemberMico Perez6-Aug-10 10:20 
GeneralComparison vs input.trim Pin
supercat910-Jun-10 6:50
Membersupercat910-Jun-10 6:50 
GeneralCool Pin
Evgeniy Stepanow20-May-10 12:32
MemberEvgeniy Stepanow20-May-10 12:32 

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