Architecture :: Singleton Class Could Be Inherited And Derived?
Oct 25, 2010Just wanted to know if a singleton class could be inherited and derived.
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Architecture :: Singleton Pattern And Abstract Class?
Aug 19, 2010I know what Singleton Pattern means and Abstract class means.What I wanted to know was how would this apply to real world.Could anyone give me any good example or simple explanation.Say I have a simple website, why would I use any of the above if any.Why would it simplify my architechture.
View 3 RepliesArchitecture :: Advantage Of Singleton Class Over Static?
Mar 30, 2010See in below I have writtine a
1. Singleton class Emp1 with Display Method and
2. Static Class with Static Method Display.
What is the advantage of singleton class over Static Class with Static members?
[Code]....
C# - How To Access A Private Data Members Of Base Class In The Derived Class
Aug 20, 2010Since we can access the private data member of base class in the derived class with the help of friend function. How can we do the same in C# asp.net? I mean whats the alternative of friend function in C# asp.net
View 2 RepliesMVC :: Trying To Setup A Base Product Class That Will Be Inherited By A More Specific Class Later?
Dec 16, 2010In my MVC project, I am trying to setup a base product class that will be inherited by a more specific class later. Here is my scenario. I have a table called ProductBase, it contains three fields, BaseProductId(PK), CatalogNum, and ListPrice. Every product in the system will share these attributes. Next, I have a table called Shirt, with three fields BaseProductId(PK, FK), Color, and Size.
I then setup an Entity Data Model that pulled in both of these tables and created classes BaseProduct and Shirt. So, in my model, I want to do something like this:
[Code]....
The main problem I have with this, is that if I do any kind of condition on CatalogNum or ListPrice, then my performance goes to crap. One of the main things we will want to do is something like this:
[Code]....
This takes an enormous performance hit, and I suspect it is because the partial class above returns to the database for each shirt.
The other problem I have with this approach, is that I cannot force the properties for the Shirt. What if I make a change to the BaseProduct? What happens when I have multiple product types, will I have to repeat this code? I assume I will need to make a change with the entity data model, but I am unsure where to begin.
Architecture :: How To Use Singleton Pattern In Project
Jun 16, 2010I am working on singleton desing patterns and want some real world example of design patterns.Can you please give me an example how you have used singleton pattern in you project. I would appreciate if you can provide code.
View 3 RepliesArchitecture :: Differnece Between Static And Singleton Patten?
Jun 28, 2010I have searched deference between Static and Singleton Patten on google but did not get it clearly.
View 12 RepliesArchitecture :: Inherited DTOs, How To Implement The Layers Facade, Bll And Dal?
Feb 18, 2010I doubt how to implement the layers
FACADE, BLL and DAL, using
DTOs specialized ..
where:
public class ClassA
{
private int _Test1;
public int Test1
{
get { return _Test1; }
set { _Test1 = value; }
}
}
public class ClassAB : ClassA
{
private int _Test2;
public int Test2
{
get { return _Test2; }
set { _Test2 = value; }
}
}
public class ClassAC : ClassA
{
private int _Test3;
public int Test3
{
get { return _Test3; }
set { _Test3 = value; }
}
}
In the database, there is the 3 tables, as described above.how do I implement the facade, bll and dal? only one class for 3 DTOs?
C# - How To Access Singleton Class's Static Method
Nov 17, 2010I have some confusion with singleton class, below are my some points:
1.Can singleton class have static method?,if yes then how we call that methods?
2.what is main difference between Static class and Singleton Class?
I have created my singleton class as follows:
[Code]....
In Above class structure I have created two method one is Static and second is non static, When I am trying to access Static Method it gives me compile time error.
How can I use static method of singleton class?
WCF / ASMX :: Singleton Class Variables Being Reset
Jul 22, 2010I have set the instanceContextMode to single to create a singleton class.I use the join to add a user to the list, and getuserlist() to retrieve the users. I added a service reference opened two browsers , made sure i simulated it such that i am adding two seperate users , and display the users returned by getuserlist. But its always displaying only one user , the current user. I also have a counter
private static int counter = 1
public int returnCounter()
{
return counter++;
}
This is returning incremented values when i open it in different browsers , but the list is always getting overritten. I am running this as a managed windows service, wsHttpBinding , and my client is a website accessing this service.
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Multiple)]
C# - Accessing Inherited Properties Through A Static Class?
Nov 12, 2010Currently, I am accessing the property by creating a static method like the one below.
public static class CartCollection : List<Cart>
{
public static void Add(Cart Cart)
[code]...
C# - Inherited Class Giving Null Exceptions?
Mar 1, 2010Here is my simple class, where i inherit from UserControl.
public class Test:System.Web.UI.UserControl
{
public void BindGrid()
[code]...
How To Overload Items.Add Procedure In Inherited Class From DropDownList
Jul 11, 2010I have my own custom class which inherits from DropDownList. Is there a way to override Items.Add procedure? How?
View 2 RepliesOutput Html To Page In Inherited PageBase Class?
Sep 2, 2010I've inherited (no pun intended) an old ASP.NET 1.1 project that is now .NET 3.5. It is designed with base class that inherits from PageBase. All of the subsequent aspx pages inherit from this custom pagebase. It currently works by generating a bunch of html text in LiteralControls for the headers and navigation bars and dropping it into an HtmlGenericControl (in this case called 'page'), which is then displayed on the page by using this.Controls.Add(page); This actually works, except for the following output:
<span>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
...
</html>
</span>
Those span's aren't supposed to be there obviously, but they come from the HtmlGenericControl, which defaults to a tagName of span. This is causing some strange behavior in IE regarding centering controls on the page.
Basically I know I should be using masterpages for this type of thing, but I don't have time to switch this all over, and I'm not an ASP.NET expert yet to where I know exactly how to solve this problem. Is there another way of sending literal text directly to the HTML output without wrapping it in a control? Obviously I need the DocType to be the first thing on the page; nothing wrapping it.
Web Forms :: Hide Inherited HyperLink-class CssClass-property?
Mar 24, 2010Well..the title sort of explains the problem..
I have a class that inherits the HyperLink-class, but I want to "hide" the CssClass-property from the intellisense and also from the "designer-view"..
I have tried the following:
[Code]....
Web Forms :: How To Add Class And Initialize Js Function In Nested / Derived Master Page's Code Behind
Feb 22, 2011I want to add a class and initialize a JS funcion behind my nested masterpage which is being dervised from an other master page. But when I add the following code in the PageLoade event in the code behined of my derived page then it give the folowing error
Exception Details:
System.NullReferenceException: Object reference not set to an instance of an object.
CODE-
[Code]....
[Code]....
[Code]....
SQL Server :: Derived Column Transformation / Add Extra Logic To Derived Column Expression?
Dec 22, 2010I'm trying to figure out how add extra logic to this derived column expression:
LEN(TRIM(pup_date)) == 0 ? NULL(DT_DATE) : ((DT_DATE)(SUBSTRING(pup_date,5,2) + "-" + SUBSTRING(pup_date,7,2) + "-" + SUBSTRING(pup_date,1,4)))
If there's a 0 in the field the code inserts a null. Otherwise it inserts a date. How can I change this to insert a NULL if a question mark "?" appears in the column?
This is what I tied using the OR operator but it's not working:
LEN(TRIM(pup_date)) == 0 || LEN(TRIM(pup_date)) == "?" ? NULL(DT_DATE) : ((DT_DATE)(SUBSTRING(pup_date,5,2) + "-" + SUBSTRING(pup_date,7,2) + "-" + SUBSTRING(pup_date,1,4)))
Architecture :: Use A C# Class Or A Interface?
Feb 3, 2011I have a block of SQL statements that I like to use as a sort of function.
I was thinking that I could make a class and inherit all of the master function, then add the parts that I need for other sections of the program in a sub class.
The problem is, up to this point I've been programming ASP .Net through visual studio, and it's kind of just programming behind controls. I'm not sure where to put the class/function/method/interface, or whatever we call it.
Of course you probably know that visual studio creates a bunch of partial classes when you do an ASP. Net application... so.. to get access to a function like object, across classes.. use an Interface?
Architecture :: How To Make The Class Libraries
Jan 22, 2010Task is to develop class libraries that can be re-use in projects but assambies should be copy righted. By this I mean developer will not give the code of class libraries to the clients yet they will provide the code of there sites/ applications, these libraries will be used just as internal development libraries. I want to make Business Logic Layer, DAL, Business Objects as class libraries
Q1. How I can control unathorised use of libraries ?
Q2. How to make assamlies non extendable ?
Q3. What security measurs I should take on this.
Architecture :: Key, Value Pairs Implementation In Class?
Feb 16, 2010In a project im working on there are many sql tables containing different ID, Name pairs. Those are represented as Enums in classes that need them however that requires casting since tables contain ID only.Also when serialize the Enum contains the ID not value.
View 3 RepliesArchitecture :: What Is The Function Of Abstract Class
Oct 24, 2010what is the function of abstract class, why design pattern need to build BLL and DAL
anyone give an example for my reference as I am getting strat to build my web-based project
Architecture :: Creating A DB Connection In My DAL Class File?
Feb 17, 2010Below is my class file.
[Code]....
Architecture :: Design A Class For Product Searching?
Oct 21, 2010I'm refactoring an old website that has product search code littered throught the codebehind. I'm trying to encapsulate the search logic into its own class so I've created a Product class with a Search() method. I would like some suggestions about OO best practices so that the class is reusable and maintainable. The questions I have are:
- Should I make the search() method an instance method or make it static? For now the class is just really there to encapsulate my search logic
- If I make it an instance method should it return a list of products or should it populate a member property that I can access like p.Search(); var x = p.ProductList;
- The search method requires upward of 7 parameters of different types, what's the best way to provide them?
- pass them all i.e. p.Search (param1, param2, ..., param7)
- create a SearchParams structure in the class, populate it and pass that i.e. p.Search(searchParams)
- Instantiate a Product object and set properties on it that are used by the Search method i.e. p.ID = 123; etc.... p.Search();
I've used variations of the above before but would like to know what's the best way.
Architecture :: Creating A Separated Class For Database Connection?
Dec 10, 2010i have the following code:
[Code]....
I was trying to implement as above. How can i call this class from the code behind of my page, and call the methods Open and Close connection ?
How do i instantiate the object ?
Architecture :: Access Class Files Not In App_Code Folder
Feb 25, 2010I have a single project. and I have two folder in it. In the 1st folder I have a class named Class1 and in the 2nd folder I have a class named Class2. Can anyone tell me how I can access members of Class1 in Class2. I have tried by adding namespace in Class1 and Using that namespace in Class2. But it is giving error. It is easy to access classes or their members from App_Code folder. I don't want to put my classes in app_code folder.
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