#extension-methods

How-to: Razor HtmlHelper Extensions (or other namespaces for views) Not Found #solution #development #dev

Razor HtmlHelper Extensions (or other namespaces for views) Not Found

Dunno if this was happening in the PR or Beta, but if I create an extension method on HtmlHelper, it is not recognized in a Razor powered page:

namespace SomeNamespace.Extensions { public static class HtmlExtensions { public static string Foo(this HtmlHelper html) { return "Foo"; } } }

I added it to the <Namespaces>section in

How to: Static extension methods #it #solution #fix

Static extension methods

Possible Duplicate: Can I add extension methods to an existing static class?

Is there any way I can add a static extension method to a class.

specifically I want to overload Boolean.Parse to allow an int argument.

Answer [by Ray]: Static extension methods

It doesn’t look like you can. See here for a discussion on it

I would very much like to be proven wrong though.

Answe…

How to: Operator Overloading with C# Extension Methods

Operator Overloading with C# Extension Methods

I’m attempting to use extension methods to add an operater overload to the C# StringBuilder class. Specifically, given StringBuilder sb, I’d like sb += "text" to become equivalent to sb.Append("text").

Here’s the syntax for creating an extension method for StringBuilder:

public static class sbExtensions { public static StringBuilder blah(this…

Fixed Can I add extension methods to an existing static class? #dev #it #asnwer

Can I add extension methods to an existing static class?

I’m a fan of extension methods in C#, but haven’t had any success adding an extension method to a static class, such as Console.

For example, if I want to add an extension to Console, called ‘WriteBlueLine’, so that I can go:

Console.WriteBlueLine("This text is blue");

I tried this by adding a local, public static method, with Console as…

Fixed Does C# have extension properties? #dev #it #asnwer

Does C# have extension properties?

Does C# have extension properties? If not, are there any plans for them to be added to the language?

For example, can I add an extension property to DateTimeFormatInfo called ShortDateLongTimeFormat which would return ShortDatePattern + " " + LongTimePattern?

Answer: Does C# have extension properties?

You can create a class that inherits, for instance,…

Fixed Distinct() with lambda? #dev #it #asnwer

Distinct() with lambda?

Right, so I have an enumerable and wish to get distinct values from it.

Using System.Linq, there’s of course an extension method called Distinct. In the simple case, it can be used with no parameters, like:

var distinctValues = myStringList.Distinct();

Well and good, but if I have an enumerable of objects for which I need to specify equality, the only available overload…

How to: Why is there not a ForEach extension method on the IEnumerable interface?

Why is there not a ForEach extension method on the IEnumerable interface?

Inspired by another question asking about the missing Zip function:

Why is there no ForEach extension method in the Enumerable class? Or anywhere? The only class that gets a ForEach method is List<>. Is there a reason why it’s missing (performance)?

Answer: Why is there not a ForEach extension method on the IEnumerable…

Fixed What are your favorite extension methods for C#? (codeplex.com/extensionoverflow) #dev #it #asnwer

What are your favorite extension methods for C#? (codeplex.com/extensionoverflow)

Let’s make a list of answers where you post your excellent and favorite extension methods.

The requirement is that the full code must be posted and a example and an explanation on how to use it.

Based on the high interest in this topic I have setup an Open Source Project called extensionoverflow on Codeplex.

Please…