throw

问题 Is there a difference in writing: throw SomeException; and throw(SomeException); I have seen some sources that claim the latter (with parentheses) is not a good option for some reason but alas I can not recall where I've seen this. 回答1: There should not be any functionality difference between the two expressions apart from the parentheses. I have never heard of any clear reason that says why one should be superior to the other. To me the first option looks more intuitive as it does not

问题 Is there a difference in writing: throw SomeException; and throw(SomeException); I have seen some sources that claim the latter (with parentheses) is not a good option for some reason but alas I can not recall where I've seen this. 回答1: There should not be any functionality difference between the two expressions apart from the parentheses. I have never heard of any clear reason that says why one should be superior to the other. To me the first option looks more intuitive as it does not

问题 Identical to "How do exceptions work (behind the scenes) in C++", but for C# . I know that the steps below have to be performed when an exception is thrown. Find the nearest handler for the exception type; Unwind the stack up to the handler level; Call the handler; Find and call every finally blocks. How does .NET handles these operations? How does the mapping for the "current" handlers work? How much code is emitted in a try/catch block? And in a throw block? 回答1: Read Christopher Brumme's

问题 Identical to "How do exceptions work (behind the scenes) in C++", but for C# . I know that the steps below have to be performed when an exception is thrown. Find the nearest handler for the exception type; Unwind the stack up to the handler level; Call the handler; Find and call every finally blocks. How does .NET handles these operations? How does the mapping for the "current" handlers work? How much code is emitted in a try/catch block? And in a throw block? 回答1: Read Christopher Brumme's

问题 Doing a code analysis gave me item CA2200: CA2200 Rethrow to preserve stack details 'func()' rethrows a caught exception and specifies it explicitly as an argument. Use 'throw' without an argument instead, in order to preserve the stack location where the exception was initially raised. I have implemented the suggestion, but I seem to get the same stack trace regardless. Here is my test code and output (the white space is intended to give obvious line numbers): Expected error at Line 30 using

问题 I noticed by accident that this throw statement (extracted from some more complex code) compiles: void foo() { try { } catch (Throwable t) { throw t; } } For a brief but happy moment I thought that checked exceptions had finally decided to just die already, but it still gets uppity at this: void foo() { try { } catch (Throwable t) { Throwable t1 = t; throw t1; } } The try block doesn't have to be empty; it seems it can have code so long as that code doesn't throw a checked exception. That

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . Im not getting the throw keyword, why use it? What are the benefits of it? As of now I've got this in my UI class: try { Classreference.MethodToRun(); } catch (Exception ex) { MessageBox.Show(ex.ToString(),

问题 Let's say I'm testing the below React component with jest --coverage : class MyComponent extends React.Component { constructor(props) { super(props) if (props.invalid) { throw new Error('invalid') } } } the coverage report will say that the line throw new Error('invalid') is uncovered. Since .not.toThrow() doesn't seem to cover anything I create the below test with Enzyme: const wrapper = shallow( <MyComponent invalid /> ) it('should throw', () => { function fn() { if (wrapper.instance()

问题 Running this with mocha results in timing out, rather than letting mocha catch the error so it could fail immediately.. var when = require('when'); var should = require('should'); describe('', function() { it('', function(done) { var d = when.defer(); d.resolve(); d.promise.then(function() { true.should.be.false; false.should.be.true; throw new Error('Promise'); done(); }); }); }); http://runnable.com/me/U7VmuQurokZCvomD Is there another way to make assertions inside the promise, such that

问题 I want to throw a custom exception which is the data validation exception in a controller of my CakePHP application. How do I create my own custom exception handler in Cakephp so that I can throw the exception and catch the exception? My code example: function getUserDetails($userid){ try{ if(!$validUser){ throw new Exception('Invalid User'); } return $userDetailsData; //returned from db }catch(Exception $e){ echo 'Error:'.$e->getMessage(); return; } } is it possible to use here custom