DotNetKicks.com - Stories tagged with ExtensionMethods

How and when (not) to use Extension Methods in C# and .NET?

Tue, 28 Oct 2008 15:46:11 GMT

Lets first briefly examine Extension Methods, show some basics usages and then we will tackle some more advanced and concrete examples used to provide fluent, natural DateTime operations (similar to Date and Time operations available in Ruby on Rails).

Add scripts to head dynamically

Fri, 08 Aug 2008 08:22:21 GMT

Many times when i develop a user control i have the need to add some javascript to the header of the page. But the header doesn't have a method where you can add script and RegisterStartupScript inserts the script at the bottom of the page. So i thought let's create an extension method...

.NET Utility Libraries Galore

Wed, 23 Jul 2008 01:23:09 GMT

Yesterday Karl Seguin announced a new .NET Extension Library. One of the really interesting pieces of the library is a streamlined approach to a simple dictionary imagecache, which is similar to the one described in another interesting looking utility library called ShadeTree. Recently, Ayende Rahein reviewed another .NET utility library called Umbrella, which looks like a pretty wide and deep set of utilities. As I am about to create a new solution to consolidate the utility functionality we use across our various projects, it got me thinking it might be time to pick an established (or growing) library from the community and try to contribute any missing pieces we need for our own projects.

Vb.Net one better than C#

Fri, 18 Jul 2008 21:31:02 GMT

This is the first time I have envied VB over C#. Here's a thing that is useful and you can do in Vb.Net, but not in C#.

C#: Enhance Enums using Extension Methods

Thu, 17 Jul 2008 11:01:02 GMT

Extension Methods are one of the coolest features that have been added in .NET 3.5. I've heard arguments that there is no reason to use them, and the only reason Microsoft added them is to enable the ability to buid LINQ. Well, I do not entirely agree with that statement; in fact, I have found a cool way to use Extension Methods to enhance the System.Enum object since it cannot be inherited. Even though Enum can not be inherited, it can be extended using Extension Methods. Here's the code to an Extension Method that extends the LocalizationMarket Enum with the ToDescriptionString() method that returns the DescriptionAttributes value for the given enum value.

C#: Enhance Enums using Extension Methods

Thu, 17 Jul 2008 11:01:02 GMT

Extension Methods

Sun, 13 Jul 2008 18:44:06 GMT

It is one of the new feature introduced in C# 3.0 "As the name implies, extension methods extend existing .NET types with new methods." Here i am going to extend the String type to write an extension method. Example Adding a IsValidEmailAddress method onto an instance of string class:

Finally, a Good Reason for an Extension Method

Thu, 10 Jul 2008 07:25:12 GMT

I finally understand why extension methods are useful.

Extension Methods + Attributes = A Whole New World!

Mon, 07 Jul 2008 06:31:02 GMT

A post about combining attributes and extension methods in order to extend current code.

Useful Extension Method On String

Mon, 30 Jun 2008 10:37:56 GMT

.NET Framework provides String.IsNullOrEmpty() method which return true if the string is null or empty. It does not however take care of a string which only contains spaces. Often while persisting data we do not want to persist just empty strings. In past I have made this check before I let my data pass through. Today I thought of creating an extension method to do the same for me.

Extension Methods and Scoping

Sat, 28 Jun 2008 08:19:31 GMT

There are a few scoping rules that you must keep in mind when using extensions methods. Problems with scoping and extensions methods are rare, but when you encounter them they are quite vexing.

MVC: Creating SSL Links/URLs

Thu, 12 Jun 2008 18:31:10 GMT

A couple days ago a reader sent in a question regarding how to use SSL with the MVC framework. Specifically the reader wanted to know the easiest way to make an Ajax call to a HTTPS page from a non HTTPS page. The tricky part here is to do so without hard-coding any URLs, so I whipped up a few extension methods that should make this a bit easier.

LINQ Single and SingleOrDefault

Tue, 20 May 2008 13:09:20 GMT

This post explains about the Single and SingleOrDefault extension methods of LINQ, possible exceptions which can be thrown, and provides code examples both in C# and VB.NET along with code comments.

Extension Methods Roundup: IndicesWhere, TakeEvery, Distinct

Sun, 18 May 2008 15:15:14 GMT

IndicesWhere: Gets the indices where the predicate is true. TakeEvery: Take items from 'startAt' every at 'hopLength' items. Distinct: Gets distinct items by a comparer delegate and Gets distinct items by comparer and hasher delegates (faster than only comparer).

AddItem Extension Method for CheckBoxList, DropDownList, ListBox

Mon, 12 May 2008 10:16:02 GMT

Just 1 AddItem extension method which works for 5 controls to make the code a lot simpler and cleaner :-) Cheers to object inheritance and cheers to Extension Methods ;-)

Is it alright to send messages to null references?

Sun, 04 May 2008 19:45:03 GMT

Several blog posts have come up on extension methods that have in common a check for null on the extension target. This now allows to call methods on null references. I would like to hear opinions if this is good or bad or a non-issue...

Tag property without inheritance

Tue, 22 Apr 2008 14:46:04 GMT

The article show how to add support for Tag property without using inheritance

Searching for derived types in an assembly

Fri, 18 Apr 2008 05:46:02 GMT

Sometimes we need to find all classes or interfaces that derive a certain Type. There are several possible scenarios for this kind of search - For instance, if we are trying to load a plug-in assembly at runtime and wish to initialize all the classes that implement the IPluginBase interface. Using the suggested DerivedHelper makes it a lot easier.

Cool Extension Methods for IDataReader Interface

Tue, 15 Apr 2008 22:55:08 GMT

18 cool Extension Methods to for cleaner data access using the DataReader class. Cut down your data access code by using these 18 Extension Methods. Full source code available for download :-)

[Flags] and you - Take 2

Tue, 15 Apr 2008 20:01:03 GMT

Comparing enum values can sometime leave your code a little messy and inaccessible. Using this small EnumHelper extension methods class, your code should be left a little more readable and fluent.

FormatWith - String.Format Extension Method

Thu, 27 Mar 2008 16:31:02 GMT

My first and favorite extension method.

A couple of really useful Extension Methods

Tue, 25 Mar 2008 00:06:24 GMT

Here are a couple of extension methods for working with WebControls and Tables that I have found really helpful lately.

Using Extension Methods for Fluent Interfaces

Fri, 21 Mar 2008 14:56:52 GMT

Fluent interfaces provide a compelling concept that has been used in isolated spots. With LINQ it is also backed up with functional programming concepts and in turn becomes a more broadly usable concept. Extension methods can be used to implement fluent interfaces in more general cases.

Using extension methods for decomposition

Sun, 16 Mar 2008 10:23:12 GMT

A look at whether extension methods may support new patterns or idioms.

Cool TrimText Extension Method for TextBox

Mon, 03 Mar 2008 08:18:13 GMT

Really cool and simple Extension Method for handling user input in TextBoxes