exception-handling

问题 I am creating an array of data: var data = new Data[] { 1, "string", true, //.. }; //In this case, assume that strings and booleans are supported types, but integers are not. When I store the set of data, it runs through a series of if statements to store data: if (data is string) StoreData(data as string); else if (data is boolean) StoreData(data as boolean); //.. Because integers are not supported, I would like my code to handle it appropriately (whether it would be logging, etc.). However,

问题 How do I deal with the following error so that my script doesn't stop working when the exception occurs: NotReadableException in AbstractDecoder.php line 302: Image source not readable I've tried using the following ($file is the url of the image): // Return false if error try { $img = Image::make($file); } catch(NotReadableException $e) { return false; } This doesn't seem to catch the exception and return false. What else can I do? 回答1: You either need the full namespaced exception in the

问题 I want to catch all exceptions raised (handled or unhandled) to log them. for unhandled i use ThreadExceptionEventHandler and UnhandledExceptionEventHandler but i want to catch and exceptions that are in try catch block with or without (Exception e). It's possible to inherit the exceptions class to create a general event? 回答1: Inheriting from Exception to provide your own Exception class would work fine for exceptions you generate in your code, and you could use the inner exception

问题 I have following code: @Repository public class UserDAOImpl implements UserDAO { public void addUser(User user) { throw new HibernateException("unchecked exception"); } } @Service public class UserServiceImpl implements UserService { @Autowired private UserDAO userDAO; @Override public void addUser(User user) { try { userDAO.addUser(user); } catch (Exception e) { e.printStackTrace(); } } } web.xml: <context:component-scan base-package="org.example.dao, org.example.services"/> <mvc:annotation

问题 In this post, python has traceback library to get some detailed error information (line number, file name ...). Does C# have similar functions to know what file/line number that generates the exception? ADDED I came up with the following code based on the answers. using System; // https://stackoverflow.com/questions/4474259/c-exception-handling-with-a-string-given-to-a-constructor class WeekdayException : Exception { public WeekdayException(String wday) : base("Illegal weekday: " + wday) {} }

问题 This piece of code shows exception: Exception in thread "main" java.lang.ArithmeticException: / by zero at Ankit2.main(Ankit2.java:6) Why and how its happening? Without using try and catch block? class ankit1 { public static void main(String args[]) { float a=20,b=120,c=50,sum; sum=(a+b+c)/0; System.out.println("The average of three number is:"+sum); } } 回答1: That is a RuntimeException. You do not have to declare or catch those. Any exception that your code does not catch (declared or not),

问题 I'm using Apache Xalan (v.2.7.1) to translate XML to XHTML in Apache Tomcat (v6.0.32). Sometimes the loading gets cancelled by the client and the following exception is thrown: javax.xml.transform.TransformerException: org.apache.xalan.xsltc.TransletException: ClientAbortException: java.io.IOException at org.apache.xalan.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:636) at org.apache.xalan.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:303) ... I would like to catch

问题 I'm using the Nhibernate persistence facility from Windor's tutorial: Kernel.Register( Component.For<ISessionFactory>() .UsingFactoryMethod(config.BuildSessionFactory) .LifeStyle.Singleton, Component.For<ISession>() .UsingFactoryMethod(k => k.Resolve<ISessionFactory>().OpenSession()) .LifeStyle.PerWebRequest); Sometimes my call to config.BuildSessionFactory will fail (maybe my mappings are wrong, or my connection string is invalid or whatever). In the debugger, I can see the Nhibernate

问题 I'm doing a project in Nhibernate with MySql in asp.net. In that while executing the code I got the error like An exception occurred during configuration of persistence layer in the below line ISessionFactory factory = new NHibernate.Cfg.Configuration().Configure).BuildSessionFactory(); So let me help to trouble shoot the error. Here s my Configuration file <?xml version="1.0" encoding="utf-8" ?> <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"> <!-- an ISessionFactory

问题 My code: var fbWebContext = FacebookWebContext.Current; if (fbWebContext.IsAuthorized()) { var fb = new FacebookWebClient(fbWebContext); dynamic result = fb.Get("/me"); name.Text = result.name; } dynamic result = fb.Get("/me"); throws: (OAuthException) Error validating access token: The session is invalid because the user logged out. How should I change my code to prevent this? 回答1: You can ask for the "offline_access" extended permission. This will prevent this message and the user does not