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Why a string comes back as null
Message
De
02/12/2008 21:42:59
Timothy Bryan
Sharpline Consultants
Conroe, Texas, États-Unis
 
 
Information générale
Forum:
ASP.NET
Catégorie:
Code, syntaxe and commandes
Versions des environnements
Environment:
C# 3.0
OS:
Windows XP SP2
Application:
Desktop
Divers
Thread ID:
01365266
Message ID:
01365300
Vues:
11
>>Hi All,
>>
>>I have a method that returns a string if there is no file in a directory. I have stepped through this and watched this line get set to an empty string but when it comes back to the calling line of code, it is null. I am missing something and wonder if it is the way I did the while statement. Any ideas appreciated.
>>Thanks for the help
>>Tim
>>
>>When the return from PopQueue is set to "" then in my while statement the value of fileName is null. Why would this be?
>>
>>while ((fileName = this.PopQueue(path, filter)) != "" && llSuccess)
>>{
>>    // Do all my stuff here, process each file returned until no more files are returned.
>>}
>>
>This line while ((fileName = this.PopQueue(path, filter)) != "" && llSuccess)
>is a bit strange.
>
>I would try to create a separate variable
>

>string fileName;
>
>fileName = this.PopQueue(path, filter);
>
>while (fileName !="" && llSuccess)
>(
> fileName = ..;
> do stuff
>}
>

>>
The problem with this Naomi is the fileName variable would never change since it occurs prior to the while loop. I need to reset fileName as what drives the loop. I agree it is a bit funky to read but why does fileName get set to "" and then be null when it gets back to here? I don't understand that.
Tim
Timothy Bryan
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