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C++ Q&A: Singleton Class Private Constructor, C# Singleton Class, and More

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

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Singleton Pattern and Abstract Class


I 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.

Thanks in advace. 

singleton class and multithreading


I have a singleton class thats used throughout an application.  The app will be multi threaded, each thread will access methods in the singleton class.  Is it best to create an instance of the singleton class at application startup then pass that into each thread, or is it safe to create an instance in each thread separately ?  (I check that no instance currently exists in the singleton class itself, so only 1 instance will ever be invoked)

Question About singleton class


Just wanted to know if a singleton class could be inherited and derived.


Referenced WebService, class constructor with parameters

Hi, I have WebService which is referenced in C# ClassLibrary project. In WebService project I have a class named User, which has two constructors - one without parameters and one whith parameters. When I try to create instance of User class from WS in ClassLibrary, I can use only constructor with parameters. My question is, how can I use in constructor with parameters like User u = new User("some@email.com", ...);. Any idea? Thansk

Derived class and try call private/protected base member


Hi, i often write a class derived from built in .NET class.

Unfortunately, there are many methods/properties/fields that marked private/internal (i decompile using net reflector),
so i call the members using reflection (get method/field/property, invoke method).

The reflection is damn slow!

Anyone knows how to solve my problem? Or have alternate method instead of using reflection?


*** the sealed, internal, and private keywords is enemy for me, it prevents the developer for derivering a class/type.

Singleton Design Pattern in C#, Vb.NET

Ensure a class has only one instance and provide a global point of access to it.

Class Diagrams

Class diagrams show the static structure of the systems. Classes define the properties of the objects which belong to them. These include:

Attributes - (second container) the data properties of the classes including type, default value and constraints.

Creating a Simple Class in C#

The second article in the C# Object-Oriented Programming tutorial describes how classes are created in C# and how behaviour, in the form of publicly visible and private, hidden methods can be added. This demonstrates some of the uses of encapsulation

Static Class for Beginners

In general, the members of a class can be accessed by instance of that class when they are in public, but there comes a situation to access or call members of a class without an instance and this can be achieved by declaring them as static

Singleton Design Pattern in Asp.net using C#

When we want to make a only one instance of a class and also making sure that there is a global access point to that object then the design pattern we user is called Singleton. The pattern ensures that the class is instantiated only once and that all requests are directed to that one and only object.

Singleton Pattern-Creational Patterns

The Singleton pattern is a specialist creational pattern as it's primary focus is to facilitate a single shared instance of our object rather than to decouple our client from the object's implementation as with the other creational patterns.

abstract away the source of the connection string using a class with a static property.

ASP.NET provides a configuration system we can use to keep our applications flexible at runtime. In this article we will examine some tips and best practices for using the configuration system for the best results.

The element of a web.config file is a place to store connection strings, server names, file paths, and other miscellaneous settings needed by an application to perform work. The items inside appSettings are items that need to be configurable depending upon the environment, for instance, any database connection strings will change as you move your application from a testing and staging server into production.

Let's abstract away the source of the connection string using a class with a static property.

MessageQueue Class

This sample demonstrates two way communications using message queuing between a device application and a desktop application. One application sends book order messages to a message queue and another application receives these book orders from the message queue and responds to the device queue that the orders have been processed.

How to change the default page base class?


I've tried setting the <pages pageBaseType="DynamicWebPage" /> value in web.config, but when I response.write out the page type, I'm still getting Microsoft.WebPages.WebPage.

I'm simply trying to sub-class WebPage and add some additional functionality such as a dynamic PageData dictionary similar to Phil Haack's dynamic ViewData dictionary.



Can I replace the EntityObject as base-class in Entity Designer 3.5 sp1?


I'm using EF3.5sp1 for a project, and I've been working around many of its problems... as such, my entity partial classes have a lot of logic in them for change-tracking and whatnot.  Obviously, I'd like to factor this logic out into a common base class, but of course all my objects must derive from EntityObject.  Is it possible to tell them to derive from some class of my own invention (which would actually likely derive from EntityObject themselves)?

I'd rather avoid editing the EDMX file unless the changes will be safe on entity-model-update, since I'm still making changes to the database schema in this early state of my project.


Also, is there any good workaround for the fact that the change isn't tracked when you change EntityReference.EntityKey?

How to implement custom HttpContext for each request under class that implements IHTTPHandler


Hello All,

I created an application and implemented IHTTPHandler for all incoming request ending with ".aspx" extension.

Under "ProcessRequest" module, I am creating an instance of HttpContext (with URL attributes different from my application's URL i.e. if I am working on localhost then speciying Yahoo.com as its URL) and assigning it to "context" which comes as method argument.

After redirection, an error is generated. Also, the custom HTTPContext is not passed to the requested page (default.aspx, in my case.)

Code is as follows.

    Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) Implements System.Web.IHttpHandler.ProcessRequest
            Dim requestedUrl As String
            Dim targetUrl As String
            Dim urlLength As Integer
            'Save settings which will be used while redirecting to appropriate page
            requestedUrl = context.Request.RawUrl
            If requestedUrl.IndexOf("?") >= 0 Then
                targetUrl = requestedUrl.Substring(0, requestedUrl.IndexOf("?"))
                targetUrl = requestedUrl
            End If
            If targetUrl = Nothing Or targetUrl.Length = 0 Then
                targetUrl = requestedUrl
            End If

Using a GenericHandler as a WebResource inside a Class Library



I hope this is the right place to ask this question.

I'm trying to make a control class library. I want to have a GenericHandler as a WebResource so I could call it from the web project that will use that control.

I need this handler will get parameters from the query string and return JSON data acourding to what it get in the QS.

I know how to create JS and images WebResources, so I tried the same on a generic handler I added to the class library project but all it does is return the source of the handler file and not the result.


Is what I'm trying to do possible? If so, what should I do?


Thank :-)

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