circular-reference

问题 Can anybody explain why circular reference is being set twice in the followig code? //declare panel this.cntnrPnl = new JPanel(); //define layout manager for the panel - but why circ ref? this.cntnrPnl.setLayout(new BoxLayout(this.cntnrPnl, BoxLayout.Y_AXIS)); Why is it necessary to link the BoxLayout back to the JPanel container explicitly instead of JPanel.setLayout doing the setting itself behind the scene and using a setter from BoxLayout for code compactness? E.g.: this.cntnrPnl

问题 I am using windsor castle as my IoC container, and has run in to a bit of a problem. First of all - i know about: Castle Windsor: How to prevent circular references in factory-created objects were the created objects refers back to the factory But since circular reference is considered as "Code Smell" and i should consider refactoring app architecture i am asking anyway. I have very similar situation: public class OperationsFactory { private GeneralSettingsManager m_generalSettings; private

问题 I seem to recall a way to setup the __destruct for a class in such a way that it would ensure that circular references would be cleaned up as soon as the outside object falls out of scope. However, the simple test I built seems to indicate that this is not behaving as I had expected/hoped. Is there a way to setup my classes in such a way that PHP would clean them up correctly when the outermost object falls out of scope? I am not looking for alternate ways to write this code, I am looking for

问题 Say I have code like following: class A { b: B; constructor() { this.b = new B(this); } } class B { a: A; constructor(a: A) { this.a = a; } } let a= new A() When I want to destroy instance of a: 1 Should I just a=null; or a.b.a=null; a=null; ? 2 Is there any way to write code to test results? Say some code to detect instance number of some class in the memory? 回答1: If there's no reference to a or b it will be marked as unreachable by the garbage collector and be cleaned together, you don't

问题 I need to serialize an object graph like this: public class A { public B Link1 {get;set;} } public class B { public A Link2 {get;set;} } So that the json only gets two instances, but is deserialized correctly again. E.g. using a meta Id or something similiar. I know that there is a way in Json.NET as described here: http://note.harajuku-tech.org/serializing-circular-references-with-jsonnet with meta ids. Is there a similiar feature in ServiceStack.Text Json Serializer? Otherwise, is it

问题 I have several BusinessObject classes that refer to each other and I need to serialize one in a JsonResponse and return it to my view. I keep getting a circular reference exception and I cannot get rid of it. I have placed the [ScriptIgnore()] decorator on every property that is not a simple data type property and I am still getting the exception. I cant figure out where the problem is, as I am blocking the serializer from just about everything and it is still blowing up on me. Is there any

问题 I'm using EF 4.1 Database First approach, with T4 template generating my POCO classes in separate assembly. I have repositories for fetching data, and service layer which is used for communication with UI. I was trying to make cascading dropdowns. I'm new in MVC and EF 4.1, so I searched stackoverflow for possible solutions. This is sample viewmodel class: public class MyViewModel { public int CustomerId { get; set; } public string CustomerName { get; set; } public IEnumerable<Phone> Phones {

问题 I have 2 tables: Empleados(**numEmpl**, nombre, apellido, sexo, telefono, salario, numDept) Departamentos(**numDept**, nombreDept, numDirect) In departamentos: numEmpl is primary key numDept is foreign key reference to Departamentos(numDept). In departamentos: numDept is the primary key And numDirect is foreign key reference to Empleados (numEmpl) So there is a circular reference. First of all I created the Tables: CREATE TABLE EMPLEADOS(numEmpl primary key, nombre, apellido, sexo, telefono,

问题 I'm working with backbone.js building some complex view relationships, and I'm wondering if there are any problems from a javascript performance standpoint of doing something that looks like this: var viewOne = Backbone.View.extend({ tagName : 'li', initialize : function() { this.v2 = new viewTwo({parent:this}); }, clickHideOne : function() { $(this.el).removeClass('selected'); } }); var viewTwo = Backbone.View.extend({ tagName : 'a', initialize : function() { this.bind('click', this

问题 Here is our dependency tree: BigApp -> Child Apps -> Libraries ALL of our components are HEAVILY using one of the Libraries as above ( LibA). But it has a ‘few’ public methods that require classes from ‘higher-level’ assemblies and we want to avoid CIRCULAR references. What do you propose as a good design for this? 回答1: One typical way of avoiding such things is by creating an interface that doesn't depend on anything. Then BigApp and LibA can both depend on the interface. BigApp can supply a