overriding | 易学教程

Override (or shadow) a method with extension method? [duplicate]

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问题 Possible Duplicate: Is there any way in C# to override a class method with an extension method? Is it possible to override or shadow (new in C#) instance methods with extension methods? 回答1: No. From MSDN: You can use extension methods to extend a class or interface, but not to override them. An extension method with the same name and signature as an interface or class method will never be called. At compile time, extension methods always have lower priority than instance methods defined in

How can I remove CSS element style inline (without JavaScript)?

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问题 I have a style assigned for a specific HTML element in my stylesheet file, like this label { width: 200px; color: red; } In one special case, I would like to use a label element in the HTML document, but ignore the style specified for the label element (just for one instance in the document). Is there any way to achieve this in a generic way without overriding the element style attributes with inline styles ? <label for="status">Open</label> To reiterate, to the HTML code displaying the label

internal abstract methods. Why would anyone have them?

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问题 I was doing some code review today and came across an old code written by some developer. It goes something like this public abstract class BaseControl { internal abstract void DoSomething(); } If you have a derived class within the same assembly, it would work public class DerivedControl : BaseControl { internal override void DoSomething() { } } But deriving the base class in a different assembly would give compile time error DerivedControl does not implement inherited abstract member

How can I override TimePicker to change text color

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My view has a white background, and it has to stay that way. I have a TimePicker on that white background.Everything is woking fine with android 2.3.3 but android 4.0.3 has a new timePicker style. The numbers have a very bright color. It is very hard to see them on the white background, and I didn't find a direct way to change the textColor. I don't want to change the background because it would look not so good. Is there any way to override this and set the color of the numbers to black? Sincerly, Wolfen Take a look at the android source for styles.xml https://github.com/android/platform

If static methods can't be overridden, how its working here (For Java)?

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问题 My understanding was that static variables and static methods are of a class, not of the class objects. So an Override of a static method won't work in Java, as for overriding we need an instance of a class to be created. But I was trying something today that contradicted my knowledge of Java. Please follow this code: class Parent{ public static void doIt(){ System.out.println("In static method 'doit' of class Parent "); } } class Child extends Parent{ public static void doIt(){ System.out

Possible to Subclass UILocalNotification and Change Default “Close” Button Text and Method?

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问题 Searching for a way to change the "Close" button text/functionality of a UILocalNotification ... I've found that it's impossible to access/call the text/function from another object, although subclassing UILocalNotification should allow implementation method overrides ... not to mention the creation of an accessor to get/set the "Close" button text field. What do you guys think about this? What would Apple? Has anyone tried?... EDIT: 12/21/2011 12:01 PM The question that I'm asking involves

How to override a LESS mixin variable based on a parent's variable

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I am a newbie, so be gentle. I am sure my terminology is incorrect too: suppose I have my own jumbotron override: .jumbotron { background-color: #ff4400; } and then I want to have a custom override of that where I inherit the above class and only override its background color using its color as a parameter to "lighten()". I can't figure out the syntax: .Myjumbotron { .jumbotron; /* not sure what goes below for "parent.background-color" */ background-color: lighten(parent.background-color, 30%); } Harry LESS allows you to define variables. So you can define a variable for the parent's color and

Polymorphism in Overloaded and Overridden Methods

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Let's take this simple Java code: public class Animal { public void eat() { System.out.println("Generic Animal Eating Generically"); } } public class Horse extends Animal { public void eat() { System.out.println("Horse eating hay "); } public void eat(String s) { System.out.println("Horse eating " + s); } } I'm trying to figure out which version of the three eat() methods will run. Now, when I type Animal a = new Animal(); a.eat(); The output is "Generic Animal Eating Generically", which is completely understandable. The same thing happens when I type: Horse h = new Horse(); h.eat(); The

Override back button in android

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I have to play a mp3 file and when click on back button on the device then automatically the song should stop. So I tried below given method. But it is not working. public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.audioplaying); play=(ImageView)findViewById(R.id.play); stop=(ImageView)findViewById(R.id.stop); songid=(TextView)findViewById(R.id.songid); status=(TextView)findViewById(R.id.status); String s=Songs.song; status.setText("Please Wait....!"); mp=new MediaPlayer(); try{ mp.setDataSource(s); mp.prepare(); } catch(Exception ex){ Log.e("Exception",ex

Objective-C detect if class overrides inherited method

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问题 Is there a way to dynamically detect from within a child class if its overriding its parents methods? Class A { - methodRed; - methodGreen; - methodBlue; } Class B inherits A { - methodRed; } From the example above I would like to know if class B is able to dynamically detect that only -methodRed; was overridden. The reason am wondering about this approach versus some other possibilities is because I have dozens of custom views that will be changing there appearance. It would be a lot less