dynamic

问题 I've been reading a book about Scala and there's mention of stackable modifications using traits . What are stackable modifications and for what purposes are they meant to be used? 回答1: The fundamental quality which distinguishes stackable modifications (as the terminology is used in scala anyway) is that "super" is influenced dynamically based on how the trait is mixed in, whereas in general super is a statically determined target. If you write abstract class Bar { def bar(x: Int): Int }

问题 My custom view has dynamic custom attribute,e.g. the backgroundimage attribute,assign via current week. I wan't to use construtor CalendarView(Context context, AttributeSet attrs) to pass several attribute,and I try to instantiate the attributeset with Xml.asAttributeSet,but it can't work. can anyone tell me how to do. Note:my custom view has dynamic attribute ,so I don't wan't to instantiate the custom view via xml layout. my solution is incorrect ? here is the custom view: public class

问题 I am working with Automapper and need to achieve the following mapping but not sure how it can be done. I want to map a Dictionary object to a dynamic object, so that the key is the property on the object and the value of the dictionary is the value of property in dynamic object. Can this be achieve with automapper and if so, how? 回答1: You can simply get Dictionary from ExpandoObject and fill it with original dictionary values void Main() { AutoMapper.Mapper.CreateMap<Dictionary<string,

问题 I want ask you about this problem. What do i need to create Dynamic Menu with Zend\Navigation\Navigation? In ZF1 i made like this: $container = new Zend_Navigation(); $pages = array( array( 'label' => 'Save', 'action' => 'save', ), array( 'label' => 'Delete', 'action' => 'delete', ), ); // add two pages $container->addPages($pages); and then in view: $this->navigation()->menu(); But in ZF2 pages are taking from config. Now i create \config\autoload\nav.global.php and here create page array.

问题 I am new in PostgreSQL and I wonder if it's possible to use number from table tbc as part of the table name in left join 'pa' || number . So for example if number is 456887 I want left join with table pa456887. Something like this: SELECT tdc.cpa, substring(tdc.ku,'[0-9]+') AS number, paTab.vym FROM public."table_data_C" AS tdc LEFT JOIN concat('pa' || number) AS paTab ON (paTab.cpa = tdc.cpa) And I want to use only PostgreSQL, not additional code in PHP for example. 回答1: Either way, you need

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Loading DLLs into a separate AppDomain What is the proper way to load a .NET assembly into a separate AppDomain so you can have access to its Types/Classes but still be able to unload it (and reload it). This is a tangent of this previous discussion: C# - Correct Way to Load Assembly, Find Class and Call Run() Method 回答1: Basically, you just create the new AppDomain, and then call AppDomain

问题 How can I dynamically load a jar file and list classes which is in it? 回答1: Have a look at the classes in the package java.util.jar . You can find examples of how to list the files inside the JAR on the web, here's an example. (Also note the links at the bottom of that page, there are many more examples that show you how to work with JAR files). 回答2: Here is code for listing classes in jar: import java.io.IOException; import java.util.Enumeration; import java.util.jar.JarEntry; import java

问题 I'm in the process of building a database storage for my app consisting on a single table with a huge data volume (hundreds of millions of records). I'm planning on having an index on the date field, since I'll be doing a batch recovery of all the records in a given period of time every now and then (for example, retrieving all records for the following day, at midnight). Since the number of records is huge and performance is an important concern in this system, I would like to know if there

问题 How do I create a new object in javascript based on a variable type-string (containing the name of the object)? Now I have: (with more tools coming the list will get longer...) function getTool(name){ switch(name){ case "SelectTool": return new SelectTool(); break; case "LineTool": return new LineTool(); break; case "BlurTool": return new BlurTool(); break; case "PointerTool": default: return new PointerTool(); break; } } And defined my tools like: PointerTool.prototype = new Tool;

问题 I know Delphi XE2 has the new TVirtualInterface for creating implementations of an interface at runtime. Unfortunately I am not using XE2 and I'm wondering what kind of hackery is involved in doing this sort of thing in older versions of Delphi. Lets say I have the following interface: IMyInterface = interface ['{8A827997-0058-4756-B02D-8DCDD32B7607}'] procedure Go; end; Is it possible to bind to this interface at runtime without the help of the compiler? TMyClass = class(TObject, IInterface)