exception

问题 Consider the following resource managing class class FooResouce { public: explicit FooResouce(T arg_to_construct_with) { m_foo = create_foo_resouce(arg_to_construct_with); if(m_foo == nullptr) {throw SomeException(get_foo_resource_error(), arg_to_construct_with);} } // Dtor and move operations // Other FooResource interaction methods private: foo_resource_t* m_foo; }; Now, when we decide to catch the exception and format an error message, it's easy to know what caused the exception at the

问题 I thought that element property syntax and attribute property syntax have no big semantical difference. However, I found that there must be some difference. E.g. The following example just demonstrates a simple trigger: <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Button><Button.Template> <ControlTemplate TargetType="{x:Type Button}"> <TextBlock x:Name="hello" Text="Hello" /> <ControlTemplate.Triggers>

问题 By default Google Analytics reports only the top line of an uncaught exception in its crash reports (see first picture in this blog post). I have problems having Google Analytics to show stack traces of uncaught exceptions in my app that reflect the whole stack, rather than the first line (see second picture in the blog post mentioned above for the intended result). The problem as well as a solution are explained on this blog post mentioned above. However, the solution relates to v2 of the

问题 This is my code to login to MongoDB by using MongoDB Authentication Mechanisms. try { var credential = MongoCredential.CreateMongoCRCredential("test", "admin", "123456"); var settings = new MongoClientSettings { Credentials = new[] { credential } }; var mongoClient = new MongoClient(settings); var _database = mongoClient.GetDatabase("test"); var collection = _database.GetCollection<Test>("book"); var filter = new BsonDocument(); var document = collection.Find(new BsonDocument()).ToList(); }

问题 I have methods with more than one parameter that are guarded against bad input by throwing ArgumentNullExceptions and ArgumentExceptions whenever any parameter is null. So there are two obvious ways to test this: One test per Parameter using the [ExpectedException] attribute One test for all parameters using multiple try{} catch blocks The try catch thing would look like that: try { controller.Foo(null, new SecondParameter()); Assert.Fail("ArgumentNullException wasn't thrown"); } catch

问题 From second paragraph of JavaDoc of Serializable interface : To allow subtypes of non-serializable classes to be serialized, the subtype may assume responsibility for saving and restoring the state of the supertype's public, protected, and (if accessible) package fields. The subtype may assume this responsibility only if the class it extends has an accessible no-arg constructor to initialize the class's state. It is an error to declare a class Serializable if this is not the case. The error

问题 I can't find any substantial example of error handling in Eiffel. I have only found examples that either are trivial, or they completely ignore errors, or they leave error handling to the reader. I am interested in knowing how errors can travel through the call stack in absence of exceptions. For example, I would like to know how an application that sends a network request would inform the user of a network problem that has been detected down the call chain. Something like that. -- EDIT: I do

问题 I have a ListBox with rows where each row consist of an "Image" and a "TextBlock". When I delete one row in the back with code like： this.UserListBox.Items.RemoveAt(this.UserListBox.SelectedIndex); There it throws an exception: Operation not supported on read-only collection. How can I delete row from the listbox? I am writing a Windows phone 7 APP. 回答1: If you set ItemsSource on the ListBox, then Items is internally generated and readonly. In such case you need to delete the item from the

问题 I have a service which binds another service via aidl.The bound service executes a httprequest and returns a response when the method is invoked from callign service via aidl. I am getting Networkonmainthread exception while doing this. Usage of Asynctask failed here for webservice query.Any help is appreciated :) 来源： https://stackoverflow.com/questions/6622101/networkonmainthread-exception-while-executing-httprequest-in-a-bound-service-fro

问题 I just recently read an article on http://phpmaster.com/exceptional-exceptions/ and he said this about exceptions: your calling code should never ever ever read the message. The only thing the message is good for is for developers. On the W3Schools website they show an example where they output the exception message when it is caught so I am confused. I have learned a lot from http://www.phpmaster.com and trust what they say but W3Schools is always reliable too so which is the correct thing