Different ways to call an extension method in c#

user_8652760 0
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Hi I have a simple enum Service on which there are few extension methods defined

public enum Service
{
   //enum values ..
}

public static class ServiceExtensions
{
   internal static string GetSomeCode(this Service service)
   {
      // Does something
   }

   //another extension method that calls GetSomeCode()
   internal static string GetSomeOtherData(this Service service)
   {
      // Look at the call for extension method here
      string code = GetSomeCode(service);
   }
}

I know that the syntax for calling extension method is similar as calling for member function for this specified type.

In above example it should be as -

string code = service.GetSomeCode();

I found similar use of syntax at other places in the project. I my question is there any difference between both the calls. If not then which should I prefer using ?

extension-methods .net c#
1 Answers

No, there is no difference. Further more the latter (service.GetSomeCode()) will be converted to the former (GetSomeCode(service)) during compilation.

If you visit sharplab.io and paste there the following code:

public enum Service
{
}

public static class ServiceExtensions
{
   internal static string GetSomeCode(this Service service)
   {
       return "";
   }

   internal static string GetSomeOtherData(this Service service)
   {
      
      string code = service.GetSomeCode();
      return code;
   }
}

Then you will see that the decompiled code will look like this:

using System.Diagnostics;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Security;
using System.Security.Permissions;

[assembly: Extension]
[assembly: CompilationRelaxations(8)]
[assembly: RuntimeCompatibility(WrapNonExceptionThrows = true)]
[assembly: Debuggable(DebuggableAttribute.DebuggingModes.Default | DebuggableAttribute.DebuggingModes.DisableOptimizations | DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints | DebuggableAttribute.DebuggingModes.EnableEditAndContinue)]
[assembly: SecurityPermission(SecurityAction.RequestMinimum, SkipVerification = true)]
[assembly: AssemblyVersion("0.0.0.0")]
[module: UnverifiableCode]
public enum Service
{

}
[Extension]
public static class ServiceExtensions
{
    [Extension]
    internal static string GetSomeCode(Service service)
    {
        return "";
    }

    [Extension]
    internal static string GetSomeOtherData(Service service)
    {
        return GetSomeCode(service);
    }
}

So, it is just a syntactic sugar.

user_132688550
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