exception

问题 I have made code to read text (json, xml etc.) from a text file, and convert it into a strings which can then be used by other code to convert into plain old java objects or POJOS that are annotated by jackson. I am not sure if my code handles the exceptions properly. So far, I have used the principles mentioned after my code (READ THIS DOWN VOTERS !!!), to develop the code. Note that I cannot use try with resources because I am stuck with Java 6 (even though my project JRE is 1.8). package

问题 I have made code to read text (json, xml etc.) from a text file, and convert it into a strings which can then be used by other code to convert into plain old java objects or POJOS that are annotated by jackson. I am not sure if my code handles the exceptions properly. So far, I have used the principles mentioned after my code (READ THIS DOWN VOTERS !!!), to develop the code. Note that I cannot use try with resources because I am stuck with Java 6 (even though my project JRE is 1.8). package

问题 I have a bit of code that resembles the following: try: fn() except ErrorA as e: ... do something unique ... cleanup() except ErrorB as e: ... do something unique ... cleanup() except ErrorC as e: ... do something unique ... cleanup() Is there any mechanism in Python that would allow me to call cleanup just once, only if an exception is raised? Basically the opposite of else . The best I can think of is: error = True try: fn() error = False except ErrorA as e: ... do something unique ...

问题 I know this question has been asked before numorous times but they seem to have a desktop application background and not web application. I am currently building a web application using PHP. I'm going to use a controller and model file to demonstrate my question. Controller file This file calls upon the database to query and fetch data <?php public function index() { $this->database->query("SELECT user_name, FROM test WHERE user_name = :user_name"); $this->database->execute_query("jim");

问题 I am using a FileSystemWatcher on a directory and added its event handlers, set its EnableRaisingEvents=true; and IncludeSubdirectories=false; and added NotifyFilters . While running the application if I create new folders in the specified directory sometime I get FileNotFoundException : "An error occurred while reading a directory". System.IO.FileSystemWatcher.StartRaisingEvents() System.IO.FileSystemWatcher.set_EnableRaisingEvents(Boolean value) What can be root cause of the problem? What

问题 I am using a FileSystemWatcher on a directory and added its event handlers, set its EnableRaisingEvents=true; and IncludeSubdirectories=false; and added NotifyFilters . While running the application if I create new folders in the specified directory sometime I get FileNotFoundException : "An error occurred while reading a directory". System.IO.FileSystemWatcher.StartRaisingEvents() System.IO.FileSystemWatcher.set_EnableRaisingEvents(Boolean value) What can be root cause of the problem? What

问题 I came across the phrase "zero-cost" exception handling a few minutes ago and finally went to go look it up. I had seen the phrase a few times previously in an exceptions vs return codes context. Here's a short description of "zero-cost" and its alternative "setjmp/longjmp". https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gnat_ugn_unw/Exception-Handling-Control.html GNAT uses two methods for handling exceptions at run-time. The setjmp/longjmp method saves the context when entering a frame with an

问题 My question is really simple. Please take a look at screenshot: How could that happen? I explicitly put call to Async.RunSyncronously into try ... with . 回答1: try/with in F# async workflows do not map directly to CLR protected blocks - instead if exception is raised in user code, library code will catch it and re-route to the nearest error continuation (which can be i.e with block , finally block , custom error continuation supplied in Async.StartWithContinuations etc...). This has a

问题 FileDataModel accepts data in the format userId,itemId,pref(long,long,Double). At the moment I have some itemId that consist of an 'x' at the end of the number. How do I edit the some of the itemID such that it removes the 'x' ? Is it possible to do this with a simple try catch statement? DataModel model = null; try{ model = new FileDataModel(new File("book_data/BX-Book-Ratings.csv")); }catch(NumberFormatException e){ REMOVE X } CODE: DataModel model = new FileDataModel(new File("book_data/BX

问题 I'm trying to create a application using Windows Forms in C#, however I keep getting an error stating: NullReferenceException was unhandled - Object reference not set to an instance of an object It's pointing to the line which has this code on: carBootSaleList.AddCarBootSale(newCarBootSale); The method I have on the forms interface: CarBootSaleList carBootSaleList; public void AddCarBootSale() { AddNewCarBootSale addForm = new AddNewCarBootSale(); if (addForm.ShowDialog() == DialogResult.OK)