Anatoly Lubarsky Logo
programming, design, integration, games, music

.Net 2.0: String.IsNullOrEmpty causes runtime exception

via Bill McCarthy.


I was sceptic at first but then I tested the sample and it is true - I got a dirty runtime exception in the release assembly. Man, this is scary.


So I compared debug vs. release assemblies via reflector and I get the following:


// VS code
static void test(string x)
{
    for (int j = 0; j < 10; j++)
    {
        if (String.IsNullOrEmpty(x))
        {       
            // TODO:
        }
    }
}


// DEBUG assembly
private static void test(string x)
{
    for (int num1 = 0; num1 < 10; num1++)
    {
        if (string.IsNullOrEmpty(x))
        {
        }
    }
}


// RELEASE assembly - you get EXCEPTION here !
private static void test(string x)
{
    for (int num1 = 0; num1 < 10; num1++)
    {
        string.IsNullOrEmpty(x);
    }
}

Related Posts:

Wednesday, April 5, 2006 12:37 AM

Comments

# re: .Net 2.0: String.IsNullOrEmpty cause
This just makes me think that the problem is in the JIT working on the empty if. What happens if you place some trivial code inside the if instead ?

4/6/2006 12:36 AM by User

# re: .Net 2.0: String.IsNullOrEmpty causes runtime exception
User: No, it still throws exception if I place some trivial code inside the if like: int i = j;

4/6/2006 12:42 AM by Anatoly Lubarsky

# re: .Net 2.0: String.IsNullOrEmpty cause
Yuck. I wonder how prevalent this failure would be in production code. Seems odd that no one found it until now. I did notice that it only seems to fail when the upper loop bound is > 4. Might be an unrolling issue?

4/6/2006 12:51 AM by User

# re: .Net 2.0: String.IsNullOrEmpty causes runtime exception
What is unrolling issue ?

4/6/2006 12:59 AM by Anatoly Lubarsky

Login

Subscribe via RSS

Article Categories

.Net Framework
ASP.NET Tips
C# Win32 API
HTML, CSS, Web
Javascript Tips
MSSQL Tips
System
System.Net
WebServices

Archives

(02) January 2018
(01) June 2013
(03) March 2013
(02) February 2013
(01) July 2012
(01) April 2012
(01) September 2011
(01) August 2011
(03) May 2011
(01) December 2010
(01) November 2010
(01) October 2010
(01) June 2010
(01) May 2010
(02) March 2010
(01) January 2010
(02) December 2009
(03) September 2009
(03) August 2009
(09) July 2009
(04) June 2009
(03) May 2009
(02) April 2009
(03) March 2009
(02) February 2009
(02) January 2009
(04) December 2008
(04) November 2008
(05) October 2008
(04) September 2008
(05) August 2008
(04) July 2008
(05) June 2008
(07) May 2008
(04) April 2008
(03) March 2008
(02) February 2008
(03) January 2008
(03) December 2007
(05) November 2007
(04) October 2007
(05) September 2007
(12) August 2007
(11) July 2007
(14) June 2007
(13) May 2007
(13) April 2007
(10) March 2007
(11) February 2007
(14) January 2007
(14) December 2006
(12) November 2006
(08) October 2006
(09) September 2006
(06) August 2006
(08) July 2006
(10) June 2006
(09) May 2006
(22) April 2006
(25) March 2006
(12) February 2006
(14) January 2006
(19) December 2005
(17) November 2005
(16) October 2005
(16) September 2005
(12) August 2005
(14) July 2005
(09) June 2005
(12) May 2005
(12) April 2005
(20) March 2005
(11) February 2005
(12) January 2005
(18) December 2004
(13) November 2004
(12) October 2004
(14) September 2004
(09) August 2004
(23) July 2004
(19) June 2004
(29) May 2004
(19) April 2004
(16) March 2004
(09) February 2004
(06) January 2004
(02) December 2003
(01) November 2003

Post Categories

.Net and C#
Android
Antispam
App. Development
Architecture
ASP.NET
Blogging
Deprecated Projects
Facebook Platform
Fun
Google
iOS
Javascript
Misc.
MSSQL
Music
My Games
Performance
Roller
Social Networks
Tools
Visual Studio
Web 2.0
WebServices

About Me

linkedin Profile
Recs
Who am I

My Sites

Billy Beet
x2line blogs