c# - Reflection on enum extension method located in separate assembly -

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• reflection identify extension methods 6 answers

code have:

public enum activitystatus {     = 0,     active = 1,     inactive = 2 }  public static class myclass {     public static string test(this activitystatus _value) { return _value + "111"; }  } 

and typeof(activitystatus).getmethods() doesn't contain test method. tried put in same assembly, still no success. wrong?

extension methods static methods, compiler translates call

yourenum.test(); 

to:

myclass.test(yourenum); 

so in order test method info via reflection, need inspect myclass, activitystatus parameter there.

var testmethodinfo = typeof(myclass).getmethod("test"); var firstparameter = testmethodinfo.getparameters()[0];  console.writeline (firstparameter.parametertype + " " + firstparameter.name); 

prints:

activitystatus _value 

if want all extension methods type in particular assembly, can use next code:

var extensionmethodsforactivitystatus =          typeof(activitystatus) //type assembly search            .assembly  //pick assembly            .gettypes() //get types there             .selectmany(t => t.getmethods()) //get methods type            .where(m => m.getparameters().any() &&                        m.getparameters().first().parametertype == typeof(activitystatus)) //check if first parameter our enum            .where(m => m.isdefined(typeof(extensionattribute), true)); //check if method extension method  foreach(var extensionmethod in extensionmethodsforactivitystatus)     console.writeline(extensionmethod.name); //prints test