instance-variables

问题 ASP.NET 4.0 Webforms project. I have the following in my code-behind. public partial class _Default : System.Web.UI.Page { private string testVar; protected override void OnInit(EventArgs e) { string testVar = "test"; } protected void Page_Load(object sender, EventArgs e) { var whatsTheValue = testVar; } } I'm setting a break point inside each method. When the local variable, testVar , is set in OnInit , if I quick watch the instance variable, it also has the value "test". When I play through

问题 I mostly code in PHP and Java, but I will occasionally work on the front end of a project and use JavaScript. I usually create objects differently than below, but I came across this and it caught my interest being that the syntax is similar to what I usually program in. I was poking around, trying to figure out how to use instance variables in JavaScript classes using the syntax below. I've tried declaring the instance variables by name; , or _name; , or var name; , or all of those previous

问题 I have a list of values which I would like to use as names for separate tables scraped from separate URLs on a certain website. > Fac_table [[1]] [1] "fulltime_fac_table" [[2]] [1] "parttime_fac_table" [[3]] [1] "honorary_fac_table" [[4]] [1] "retired_fac_table" I would like to loop through the list to automatically generate 4 tables with the respective names. The result should look like this: > fulltime_fac_table 職稱 V1 "教授兼系主任" V2 "教授" V3 "教授" V4 "教授" V5 "特聘教授" > parttime_fac_table 職稱 姓名 V1

问题 I have a list of values which I would like to use as names for separate tables scraped from separate URLs on a certain website. > Fac_table [[1]] [1] "fulltime_fac_table" [[2]] [1] "parttime_fac_table" [[3]] [1] "honorary_fac_table" [[4]] [1] "retired_fac_table" I would like to loop through the list to automatically generate 4 tables with the respective names. The result should look like this: > fulltime_fac_table 職稱 V1 "教授兼系主任" V2 "教授" V3 "教授" V4 "教授" V5 "特聘教授" > parttime_fac_table 職稱 姓名 V1

问题 This question already has answers here : What is the difference between <%, <%=, <%# and -%> in ERB in Rails? (7 answers) Closed 5 months ago . My questions details are here undefined method `items' for nil:NilClass in @cart.items.each The extra things I added were a cart method in application controller and also made it helper_method to make it available in all views across the application helper_method :cart def cart @cart = Cart.find(session[:cart_id]) end When in my view I iterate over

问题 I have an application that has a Service that uses an ArrayList<Double> to store numbers in the background for a very long time; the variable is initialized when the service started. The service is in the background, and there will be frequent access to the variable (that's why I don't want to use file management or settings -- it will be very expensive for a file I/O for the sake of battery life). The variable will likely be ~1MB->2MB over its lifetime. Is it safe to say that the variable

问题 I wonder why Visual Studio is raising this warning: Access of shared member, constant member, enum member or nested type through an instance My code: Dim a As ApplicationDeployment = deployment.Application.ApplicationDeployment.CurrentDeployment If System.Deployment.Application.ApplicationDeployment.IsNetworkDeployed Then If a.IsNetworkDeployed Then ' do something End If End If What implies "through an instance"? Also, why is this a "warning"? 回答1: Showing a warning is a design option. In C#,

问题 Basically I would like to know why a static method cannot be shadowed by an instance method, (I know why, it will lead to ambiguity in certain circumstances), whereas a static variable can be shadowed by an instance variable (it applies only for subclasses). Example: public class Apartment{ static int area = 10; public static int getArea(){ return area; } } class BedroomFlat extends Apartment { int area = 10;// no problem at all public int getArea(){ // illegal line it cannot hide the super

问题 Consider the code below: <?php class Base { protected $name = "Base"; public function getName() { return $this->name; } } class Foo extends Base { protected $name = "Foo"; } $f = new Foo(); echo $f->getName(); // output: Foo $b = new Base(); echo $b->getName(); // output: Base Since in other languages such as Java won't allow you to override the instance variable, but it is possible in PHP. Is it because since PHP is weak type language so it is possible? 回答1: No, it has nothing to do with

问题 I'm having trouble in getting the singleton pattern to initialize a instance variable in smalltalk. (here is a link to another implementation for clarification) this is what I have: new ^UniqueInstance ifNil: [UniqueInstance := self basicNew. UniqueInstance: instanceVar := Object new. ]. that last line (UniqueInstance: instanceVar := Object new.) doesn't work, but that's basically what I need to do: instantiate instanceVar as an Object before returning UniqueInstance back to the caller.