Hello!

Is there any method to detect parameters values passed to
called method?

For example:

public Guid ApplicationLogin(string userName, string
password, int dbId)

was called:

ApplicationLogin("test","test",1);

I know that inside method ApplicationLogin I can detect
what method was called
and what parameters it has using object StackFrame:

StackFrame sf = new StackFrame(0);
sf.GetMethod().GetParameters() - list of parameters

But how can I detect those parameters value?
Anybody have any ideas?

Thanks

Marcin

Thank you for help - but in my case i don't store
parameter values in called object fields so i can't
retrieve them using reflection.

I want to write generic function which takes parameters
passed to any method and then use reflection method Invoke
to call another method with the same parameters.

I need something like access to parameters declared with
params keyword (f.e. method declaration: UseParams(params
int[] list) ), but that must work with method that use
standard parameters (without params keyword).

I don't even know if it's possible, but maybe somone knows
the answer.

Thanks

Marcin

>-----Original Message-----
>Hi there,
>
>You can get the value of fields in an object if you have
an instance of the
>object. This is done using Reflection. If the
method "ApplicationLogin(...)"
>updated member fields in the containing class you could
interrogate the
>instance of that class to get the values of those member
fields.
>
>To do this, you use Reflection to get a descriptor object
of the parameter
>you want to look up. In this case, it will be describing
>MyCustomClass.UserName. Of course, you start with the
System.Type object.
>
>To get your field:
>
>System.Type typeDescriptor = myInstance.GetType();
>System.Reflection.FieldInfo field =
typeDescriptor.GetField("UserName");
>string userName = (string) field.GetValue(myInstance);
>
>As an aside, I'm not sure why you'd want to interrogate
the values that were
>passed in on the method call via reflection. If you want
to save them, you
>need to persist them in a database or a business entity
object (i.e. a
>business data storage object) for further use.
>
>Hope this helps,
>Luke Venediger.
>

Hi Marcin,

It is possible to have a generic method that takes in an array of parameters
(using params keyword in your method signature) and invoke a method on an
object. You'll need a way to determine which method you want to invoke,
either by passing in a method name or by counting the number of input
parameters you receive and matching them to a method signature in the target
object.

It is only possible to write a generic scalar method if you have a fixed
number of arguments, and a way to determine which method to call based on
some ID or indicator. You will need to pass all arguments in the
lowest-common-denominator type, which in most cases is System.Object.

Either way, the concept of a generic method is not a good one, it will make
your code path unclear and could also lead to maintenance problems in the
future.

Hope that helps,
Luke Venediger.

"Marcin" <(E-Mail Removed)> wrote in message
news:077801c35bf1$c606db90$(E-Mail Removed)...
> Thank you for help - but in my case i don't store
> parameter values in called object fields so i can't
> retrieve them using reflection.
>
> I want to write generic function which takes parameters
> passed to any method and then use reflection method Invoke
> to call another method with the same parameters.
>
> I need something like access to parameters declared with
> params keyword (f.e. method declaration: UseParams(params
> int[] list) ), but that must work with method that use
> standard parameters (without params keyword).
>
> I don't even know if it's possible, but maybe somone knows
> the answer.
>
> Thanks
>
> Marcin
>
> >-----Original Message-----
> >Hi there,
> >
> >You can get the value of fields in an object if you have
> an instance of the
> >object. This is done using Reflection. If the
> method "ApplicationLogin(...)"
> >updated member fields in the containing class you could
> interrogate the
> >instance of that class to get the values of those member
> fields.
> >
> >To do this, you use Reflection to get a descriptor object
> of the parameter
> >you want to look up. In this case, it will be describing
> >MyCustomClass.UserName. Of course, you start with the
> System.Type object.
> >
> >To get your field:
> >
> >System.Type typeDescriptor = myInstance.GetType();
> >System.Reflection.FieldInfo field =
> typeDescriptor.GetField("UserName");
> >string userName = (string) field.GetValue(myInstance);
> >
> >As an aside, I'm not sure why you'd want to interrogate
> the values that were
> >passed in on the method call via reflection. If you want
> to save them, you
> >need to persist them in a database or a business entity
> object (i.e. a
> >business data storage object) for further use.
> >
> >Hope this helps,
> >Luke Venediger.
> >
>