I didn't follow my own best practices (use only derived controls), and I dragged a regular Windows Forms control to my form, wired it up and used it on my form ;-( Now I need to change the control to a derived control (derived from the same control), preserving all the settings from the designer. Is there a reliable/easy way to do this...
I have three classes; Stamp, Letter and Parcel that implement an interface IProduct and they also have some of their own functionality. public interface IProduct { string Name { get; } int Quantity { get; set; } float Amount { get; } } public class Stamp : IProduct { public string Name { get { return "Stamp"; } } ...
System.Web.UI.WebControls.UI.TableHeaderCell derives from System.Web.UI.WebControls.UI.TableCell So a method with the signature foo(TableCell tc){} Will accept instances of TableHeaderCell. However if i create two new classes and derive one from TableCell and the other from TableHeaderCell then my new TableHeaderCell class will ob...
#include <vector> struct A {int a;}; struct B : public A {char b;}; int main() { B b; typedef std::pair<A*, A*> MyPair; std::vector<MyPair> v; v.push_back(std::make_pair(&b, &b)); //compiler error should be here(pair<B*,B*>) return 0; } I don't understand why this compiles (, maybe somebody may kindly provide detailed expla...
I have a class structure for a role playing game which looks like this... public abstract class Item { public abstract string Name { get; set; } } public abstract class Armor : Item { public override string Name { get; set; } } public class Helmet : Armor { public override string Name { get; set; } } Basically, I am trying ...
Is there an easy way to enforce a derived class must be serialiable? Suppose I define a interface that needs the derived classes to be serializable. According to this post, I cannot just specify the serializable attribute in the interface, because derived classes don't need to respect that. I believe I could have the interface inherit ...
class Base { public: int base_int; }; class Derived : public Base { public: int derived_int }; Base* basepointer = new Derived(); basepointer-> //Access derived_int here, is it possible? If so, then how? ...
I've tried to be descriptive :) It's rather programming-style problem than coding problem in itself. Let's suppose we have : A: public class MyDict { public Dictionary<int,string> dict; // do custom-serialization of "dict" public void SaveToFile(...); // customized deserialization of "dict" public void LoadFr...
I am deriving from TableViewCell. When i query the table view about an index path it returns a UITableViewCell. How do i find if this object is one of my custom type "CustomCell"? ...
I placed a control into a grid. let's say the control is derived from public class 'ButBase' which is derived in its turn from System.Windows.Controls.Button. The code normally compiles and app works just fine. But there's something really annoying. When you try to switch to xaml-design tab it will say 'The document root element is not ...
This is a bit of an involved problem, so I'll do the best I can to explain what's going on. If I miss something, please tell me so I can clarify. We have a callback system where on one side a module or application provides a "Service" and clients can perform actions with this Service (A very rudimentary IPC, basically). For future refer...
Title probably doesn't make a lot of sense, so I'll start with some code: class Foo : public std::vector<Foo> { }; ... Foo f; f.push_back( Foo() ); Why is this allowed by the compiler? My brain is melting at this stage, so can anyone explain whether there are any reasons you would want to do this? Unfortunately I've just seen a sim...
Im refactoring a class, and moving sections into a base class. I have a few events similar to public event EventHandler GridBinding; Which are now in the base class, but i am finding i cannot now check to see if the event is null in my derived class. Doing so gives me the error: The event 'xyz.GridBinding' can only appear on t...
In the program below, is the line Derived(double y): Base(), y_(y) correct/allowed? That is, does it follow ANSI rules? #include <iostream> class Base { public: Base(): x_(0) { std::cout << "Base default constructor called" << std::endl; } Base(int x): x_(x) { std::cout << "Base constructor called with x = " << x...
Ok, this question might more about design theory. I have successfully created controls that show up in my toolbox, so I'm pretty sure I have the process right. Also, my "AutoToolboxPopulate" is set to true, so things are showing up as I create them. My question is this: I'm sub-classing a native Control for specialized use. When I de...
When a Client serializes the following data: InternationalStudent student; student.id("Client ID"); student.firstName("Client First Name"); student.country("Client Country"); the Server receives the following: ID = "Client ID" Country = "Client First Name" instead of the following: ID = "Client ID" Country = "Client Country" The...
This code doesn't work, but hopefully you'll get what I'm trying to achieve here. I've got a Money class, which I've taken from http://www.noticeablydifferent.com/CodeSamples/Money.aspx, and extended it a little to include currency conversion. The implementation for the actual conversion rate could be different in each project, so I d...
Hi there. I'm recieving that wonderfuly ambiguous error message when using one of my webmethods on my WCF webservice. As that error message doesn't provide any explanation whatsoever allow me to post my theory. I believe it may have something to do with the return type I'm using I have a Types DLL which is refrenced in both the webser...
When a method is declared as virtual in a class, its overrides in derived classes are automatically considered virtual as well, and the C++ language makes this keyword virtual optional in this case: class Base { virtual void f(); }; class Derived : public Base { void f(); // 'virtual' is optional but implied. }; My question is...
Hi all I am using a POCO class name "Company" generate from the T4 POCO code generator to create a derived class - name "CompanyBO" by "public class CompanyBO:Company", but when i call addObject method: public void Delete(T entity) { CustomerWebPortalEntities entities = new CustomerWebPortalEntities(); ...