Extension methods in C# 3.0

**Daniela007** · 12-02-2010

Hi all,

I am a programming software C# 3.0 newly. I heard that a new Supplementary features can be considered are aimed at the development of LINQ to LINQ easier to use, created some of the new features, of course, these new features can also be non - LINQ-related features are used. Can anybody have any idea about the Extension methods in C# 3.0. Please reply.

**Reegan** · 12-02-2010

Extension methods defined, require attention in three parts: a static class (private public can be); two static methods (private-public can be); and a pre-function arguments with this (must be the first parameter ago)

Code:

namespace my name.lastname
{
static class MyExtensionMethods123
{
internal static void Print (this object s)
{
Console.WriteLine (s);
}
}
}

**opaper** · 12-02-2010

My Extension methods used points to note: using namespace where you defined.

Code:

using myname.G123;

static void Main (string [] args)
{
object o = "follow";
o.Print ();
}

Such a very simple code, we can very easily against the open-source third-party controls that do not increase the additional needs many of our own features.

**MindSpace** · 12-02-2010

We look at some special cases, through the analysis of these special circumstances, we can better understand extension methods like extended class way as the original method when the processing logic. We are not a third-party open source components of a class extends a method, such as method: Print. After a period of time, this third party has released a new version of the component, such an increase in the Print method.

Code:

namespace name.book
{

public class MyClass123
{
public void Print ()
{
Console.WriteLine ("****");
}
}
static class MyExtensionMethods123
{
internal static void Print (this MyClass123 s)
{
Console.WriteLine123 ( "hi" + s.ToString ());
}
}

**Modifier** · 12-02-2010

The extension method with the method of the class conflict of the time, the compiler does not report the use of any error, this time to a class method of highest priority, when we use the method of the class, rather than extension methods. There are so many types of other extension methods is also present in the C# 3.0. Check that and reply.

**Praetor** · 12-02-2010

For instance, I am using the following extension method in C#3.0

Code:

namespace myname.any
{
static class MyExtensionMethods123
{
public static int Test0123 (this int i)
{
return i * 4;
}

public static int Test023 (this int i)
{
return i + 9;
}
}
}