behavior | 易学教程

Compiler Trivia: What is consequence of this code

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问题 I was reviewing some code today and came across some code (accurately portrayed by this snippet)... public abstract class FlargBase{ public FlargBase(){ this.DoSomething(); } public abstract void DoSomething(); } public class PurpleFlarg: FlargBase{ public PurpleFlarg() : base(){ } public override void DoSomething(){ // Do something here; } } The compiler gives no errors or warnings, but CodeAnalysis warns that the call chain contains a call to a virtual method and may produce unintended

Using IParameterInspector.BeforeCall(string operationName, object[] inputs) to abort a call

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问题 I have a custom behavior in which I implement "IParameterInspector" to be able to use BeforeCall and AfterCall. I'm currently using these methods to make some verifications before the call execute on my WCF service. Here's my Attribute: [AttributeUsage(AttributeTargets.Class)] public class SendReceiveBehaviorAttribute : Attribute, IServiceBehavior { public SendReceiveBehaviorAttribute() { } public void ApplyDispatchBehavior(ServiceDescription desc, ServiceHostBase host) { foreach

iPhone - viewDidUnload/viewDidLoad called inconsistently

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问题 I was doing some testing and debugging of my Iphone app today and encountered some strange behaviour. In my MainView I have two modal views and when showing one of these using presentModalViewController I noted that the viewDidUnload method of my MainView was called while it was not happening when showing the other. It was the same case for the viewDidLoad method (of MainView ) while closing the subviews. I inspected the two methods for opening and closing the subviews and the only difference

How to temporarily disable the zooming in d3.js

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问题 I am searching for a possibility to temporarily disable the zooming functionality provided by the d3 library. I tried to save the cave the current scale/translation values when the zooming is deactivated and set the zoom/translate-values when the zooming is active again. Unfortunately this will not work. Here is a code example I created : var savedTranslation = null; var savedScale = null; var body = d3.select("body"); var svg = body.append("svg"); var svgContainer = svg.append("svg:g"); var

flex datagrid custom tab behavior

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问题 I have two datagrids and I want to override the behavior of the tab-key event, so that it goes to the next datagrid, when the cursor reaches the end of the first datagrid columns. Any hints are appreciated! Markus 回答1: Markus, this is a somewhat functional demo that should get you on the right track: <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()"> <mx:Script> <![CDATA[ [Bindable] private var src

glDeleteTextures, leaking?

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问题 I found a rather disguting behaviour of glDeleteTexture, deleteing only parts of the aqcuired memory (GPU side and as Textures get saved back for the sake of speed in RAM), which in my case, is a showstopper bug, my program eating up all memory. I don't want/require you to read all of the code, it's just a demo, I'd rather know how to actually use glDeleteTextures so it does not leak any memory. The example code requires Qt 4.5 or later to compile: glleak.pro QT += opengl SOURCES += main.cpp

Why is my T-SQL Query returning inconsistent output?

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问题 I am using SQL Server 2014 and I have the following T-SQL query: USE MyDatabase GO SELECT a.ReservationStayID ,c.PMSConfirmationNumber ,c.[PropertyCode] ,a.StayDate ,c.[MTH] ,1 AS 'RN' ,a.PackagePlanCode ,c.[Market Segment Code] ,c.[Status] ,c.[CurrencyCode] ,a.RateAmount ,SUM(a.RateAmount) OVER (PARTITION BY a.ReservationStayID) AS 'CUM_Rate' ,d.[Exchange Rate] ,((a.RateAmount * d.[Exchange Rate]) / 1.15) AS 'Package Revenue Excl VAT' ,c.[Tour Operator] ,c.[Group Booking ID] ,c.[Source of

Erlang: what supervision tree should I end with writing a task scheduler?

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问题 Mostly in educational purposes I'm trying to write a task (task is an open_port({spawn_executable, Command})) scheduler. I end up with the tree like supervisor | | scheduler receiver gen_event gen_event | supervisor | dispatcher gen_server | supervisor | | | task1 ... taskN In other words: top supervisor starts scheduler and receiver and makes sure they will be alive receiver starts middle supervisor middle supervisor starts dispatcher and makes sure it will be alive dispatcher starts bottom

How State machine diagram can be represented as a Behavior for an operation in UML?

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问题 Behaviors (Method Body)can be state machines or activities - activities are easy to understand, as they are the equivalent of procedural code. I don't understand how a state machine can be used as the behavior for an operation? Could you Please provide a simple example for that? ---Note--- Operation is a specification-only element - imagine it as the method signature in OO programming languages. It has a name and a list of parameters. Behavior is (among other things) what an operation (or

UIViewController摘要

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1、self.view在首次使用时，会用loadView初始化，并触发viewdidload完成以后，继续self.view操作 IOS6.0中，弃用viewDidUnload和viewWillUnload…从而只能使用 didReceiveMemoryWarning ，在以前的ios中，didReceiveMemoryWarning会触发viewDidUnload等，但是现在起，只能自己在内存警告中处理，甚至自己释放self.view。。如果确实释放了sefl.view=nil。则在加载时会重新触发viewDidload 2、手工向tabviewcontroller、navigationcontroller发送viewWillAppear等系列消息，均会导致其向它的栈顶viewcontroller发同名消息。作为container使用的viewcontroller则无此特性, 但是在5.0以后由于(addsubview的作用)系统发的viewWillAppear会向container及其所有childController发送 3、tableViewController的初始化过程：viewWillAppear -> tableViewDatasource method -> viewDidAppear 因为更新数据源最好在 viewWillAppear中进行