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Pure C++: Generic Programming Under .NET

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

Visual Studio® 2005 brings the type parameter model of generic programming to the Microsoft® . NET Framework. Parameterized types are, of course, standard fare for C++ programmers. So, for those who are unfamiliar with them, I'll give a brief introduction to generic programming in my next few columns.

Stanley B. Lippman

MSDN Magazine April 2005

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More Related Resource Links

Pure C++: Generic Programming: Template Specialization


As I discussed in my last column, a param-eterized type that does more than simple storage and retrieval is constrained as to the acceptable types that may be safely bound to it (see Pure C++: CLR Generics Versus C++ Templates.

Stanley B. Lippman

MSDN Magazine August 2005

Pure C++: Reflecting on Generic Types


A funny thing happened to templates on their way to the common language runtime (CLR)-they lost their {type} identity. This is analogous to what happens with macros under native programs. Just as the C/C++ compilers have no awareness of macro preprocessor expansions, the CLR has no awareness of template instantiations.

Stanley B. Lippman

MSDN Magazine December 2005

Pure C++: Invoking Generic or Function Templates


As I promised last time, in this month's column I'll walk through the process of defining and invoking a generic or template function under C++\CLI. A function template or a generic function begins with the template or generic keyword followed by its parameter list.

Stanley B. Lippman

MSDN Magazine October 2005

Coding / Programming Tips for C#

Using proper guidelines and a template-framed style of coding will really helps developer to enjoy the coding with more understandable, reliable code and application development.

Creating a Generic Entity Framework 4.0 Repository

With .NET 4.0 right around the corner, I thought it would be cool to download Visual Studio 2010 beta 2 and start playing around with the next release of Entity Framework.

The initial release of Entity Framework came with a great deal of criticism. To make matters worse, there was a large uproar when it was rumored that Microsoft would be abandoning LINQ to SQL, in favor of Entity Framework. This was because, at the time, many developers felt Entity Framework was an inferior technology to LINQ to SQL. To set things right, Microsoft proactively moved forward with improving Entity Framework, in time for the 4.0 release of the .NET Framework. This is good news because my initial impressions, so far, have been nothing but positive.

A Generic Dialog ViewModel

I worked on a wpf viewmodel for dialogs, because it seemed strange to me that you needed for instance windows forms dialogs to open or save files in wpf. So I set about creating my own wpf dialogs. After creating the dialog viewmodels there still remained a small issue with the library and also I didn't have much time to write an article about it. I however published the library containing the viewmodels for dialogs with another article on my blog

C# Object Oriented Programming

So far in C# Essentials we have looked at the basics of programming in C# such as variable types and flow control. Although it would be possible to write a functional program using these techniques, there is much more to becoming a proficient C# programmer. C# is, above all, an object oriented programming language and as such any C# programmer will be expected to create object-oriented applications using this language.

Object Oriented Programming

Four core concept of OOP Object Oriented Programming. 1.Inheritance, 2.Polymorphism, 3.Abstraction and 4.Encapsulation

Object-Oriented Programming Concepts

This is the first in a series of articles describing the use of object-oriented programming techniques as implemented by the C# programming language. This series follows the C# Fundamentals tutorial that beginners are advised to read first.

Parallel port complete: programming, interfacing & using the PC's parallel

Parallel port complete: programming, interfacing & using the PC's parallel


Format Generic List Bound to Gridview


I have a generic list of a custom type. The custom type has a string and double.

I'm binding the list to a gridview and it outputs everything fine.

I'm trying to format the double column into a currency format. It is in a template field as I'm calculating a running total. I pass the value to a function that returns a double and adds the current value to a running total which I will show in the footer.

The format is not changing to currency as expected when using String.Format("{0:c}", GetTotal(Convert.ToDouble(Eval("Amount"))))

Any ideas on what might be going on and how to fix this?


Need Syntax To Make Results of LINQ Union Return Non-Generic Type



I have the below SQL which works just fine:

SELECT     Message, CreateDate, AccountId, AlertTypeId
FROM       dbo.Alerts
SELECT     TOP (100) PERCENT Status, CreateDate, AccountId,
                          (SELECT     10 AS Expr1) AS AlertTypeId
FROM         dbo.StatusUpdates
WHERE AccountId = PassedInParameter

I have been going about trying to convert the above into a LINQ method and am having problems with return types.
As the above SQL illustrates, I am querying two distinct LINQ tables - Alerts and StatusUpdates -
and then attempting to perform a Union on them. In order to do the union in LINQ, I have to have agreeing types. So, I
am using "var" to make the results of "alerts" and "updates" generic before the union.  

public IList GetStatusUpdatesAsAlertsByAccountId<T>(Int32 accountId)
            using (WorkbookDataContext dc = _conn.GetCont

A generic error occurred in GDI+.



I'm getting this error on the yellow screen and I have no idea what to do with it, or where to start:

[ExternalException (0x80004005): A generic error occurred in GDI+.]
System.Drawing.Image.Save(String filename, ImageCodecInfo encoder, EncoderParameters encoderParams) +377630
NopSolutions.NopCommerce.BusinessLogic.Media.PictureManager.GetPictureUrl(Picture picture, Int32 targetSize, Boolean showDefaultPicture) in F:\Temp\Test\nopCommerce 1.60\Libraries\Nop.BusinessLogic\Media\PictureManager.cs:396
NopSolutions.NopCommerce.BusinessLogic.Media.PictureManager.GetPictureUrl(Picture picture, Int32 targetSize) in F:\Temp\Test\nopCommerce 1.60\Libraries\Nop.BusinessLogic\Media\PictureManager.cs:180
NopSolutions.NopCommerce.Web.Administration.Modules.CategoryInfoControl.BindData() in F:\Temp\Test\nopCommerce 1.60\NopCommerceStore\Administration\Modules\CategoryInfo.ascx.cs:63
NopSolutions.NopCommerce.Web.Administration.Modules.CategoryInfoControl.Page_Load(Object sender, EventArgs e) in F:\Temp\Test\nopCommerce 1.60\NopCommerceStore\Administration\Modules\CategoryInfo.ascx.cs:99
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14

A generic error occurred in GDI+


I am getting this error at this line in my code: ImgThnail.Save(ThumbnailPath, Img.RawFormat);

Here is the entire code :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;

    public static class Thumb2
        public static string createThumb(this HttpServerUtility srv, string endPath, string tempPath, int relSize)

            string ThumbnailPath = srv.MapPath("~\\Thumb\\" + endPath);
            string dimensions;
            using (System.Drawing.Image Img = System.Drawing.Image.FromFile(srv.MapPath("~\\" + tempPath))) 
                Size ThumbNailSize = NewImageSize(Img.Height, Img.Width, relSize);
                dimensions = Img.Width.ToString() + " x " + Img.Height.ToString();
                using (System.Drawing.Image ImgThnail = new Bitmap(Img, ThumbNailSize.Width, ThumbNailSize.Height))
                    ImgThnail.Save(ThumbnailPath, Img.RawFormat);
            return dimensions;
        private static Size NewImageSize(int OriginalHeight, int OriginalWidth, double FormatSize)
            Size NewSize;
            double tempval;
            bool landscape;

F# Basics: An Introduction to Functional Programming for .NET Developers


F# has clean syntax, powerful multi-threading capabilities, and fluid interoperability with other Microsoft .NET Framework languages. We'll give you an introduction to functional programming concepts and how they're implemented in F#.

Chris Marinos

MSDN Magazine April 2010

Basic Instincts: Generic Co- and Contravariance in Visual Basic 2010


Dig into the new co- and contravariance features coming in Visual Studio 2010. Binyam Kelile provides hands-on Visual Basic examples to explain how they provide more flexibility when working with generic interfaces and delegates.

Binyam Kelile

MSDN Magazine March 2010

Patterns in Practice: Functional Programming for Everyday .NET Developers


This article examines how the new support for functional programming techniques in .NET 3.5 can developers make code more declarative, reduce errors in code, and write fewer lines of code for many common tasks.

Jeremy Miller

MSDN Magazine October 2009

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