I am using this code if (managedObject == nil) { NSLog(@\"foooo\"); } 开发者_开发百科 to test if the created managedObject is nil or not. But I can never print this Fooooo.
DOMXPath $html->query(\'//p[@class=\"myclass\"]/a\')->item(0); is not working. Here is the HTML:
I want to know if an Object in an ArrayList is null. If it\'s null, then it shouldn\'t do anything. Example:
If I have a rarely used collection in some class which may be instantiated many times, I may sometimes resort to the following \"idiom\" in order to save unnecessary object creations:
Wikipedia says NULL is for representing \"missing information and inapplicable information\". I have always underestood NULL to be appropriate to represent \"Unknown\" information, as in the field is
I have 5 fields in my DB: test1 = 1, test2 = 1, test3 = NULL, test4 = NULL, test5 = NULL PHP code: if(isset($result[\'test1\'])){$test1= \"Test1\"; echo $test1};
I\'m having performance problems on开发者_如何转开发 the live version of a system which I can\'t reproduce locally.
I wa开发者_如何学Cs playing with some characters: PaternSubjectStatus \'/#*/\'\"\\x00\"Match \'/#*/\'\"\"Match
I seem to be having an issue with the HttpServerUtility.UrlTokenDecode(string), as it is constantly returning null, causing the program to crash.
I know that it is possible to have Nullable value types that wraps the value type and gives ability to stor开发者_StackOverflow社区e null.
加载中,请稍侯......