C# Extension Method for Object

c# extension-methods
Mandrake picture Mandrake · Feb 4, 2011 · Viewed 25.3k times · Source

Is it a good idea to use an extension method on the Object class?

I was wondering if by registering this method if you were incurring a performance penalty as it would be loaded on every object that was loaded in the context.

Answer

Andrew Bezzub picture Andrew Bezzub · Feb 4, 2011

In addition to another answers:

there would be no performance penalty because extension methods is compiler feature. Consider following code:

public static class MyExtensions
{
    public static void MyMethod(this object) { ... }
} 

object obj = new object();
obj.MyMethod();

The call to MyMethod will be actually compiled to:

MyExtensions.MyMethod(obj);

Related questions

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.…

Read More
Extension methods must be defined in a non-generic static class

I'm getting the error: Extension methods must be defined in a non-generic static class On the line: public class LinqHelper Here is the helper class, based on Mark Gavells code. I'm really confused as to what this error means as …

Read More
Convert string[] to int[] in one line of code using LINQ

I have an array of integers in string form: var arr = new string[] { "1", "2", "3", "4" }; I need to an array of 'real' integers to push it further: void Foo(int[] arr) { .. } I tried to cast int and it of course failed: Foo(…

Read More