Reflection Values

[Roger Webb]

Hey All,

I've got a class that I'm trying to get a listing of the properties...ki nda
like one of the Reflection examples from Microsoft. However, unlike their
example, I need to get the value as well. And am having trouble
understanding how the GetValue() function of the PropertyInfo should be
setup as below.

Also, with it coming back as an object, is there a way to get it recast so
that the DoSomething function will work?


I'm hopeing/thinking/praying.. that there is a way to make the code below
have StringBuilder1. ToString() be
"-FirstField='Str ing1'-SecondField=2"

Any help ... or comments would be appreciated.

- Roger


class LocalClass
{
public string FirstField;
public int SecondField;
}

<snip most of procedure>
....
LocalClass LocalClass1 = new LocalClass();
LocalClass1.Fir stField = "String1";
LocalClass1.Sec ondField = 2;

Type DRType = LocalClass1.Get Type();
PropertyInfo[] PropInfo = DRType.GetPrope rties();
foreach(Propert yInfo prop in PropInfo)
{
if(!(prop.Prope rtyType.IsArray ))
{
StringBuilder1. Append("-"+DoSomething(p rop.Name,
prop.GetValue(p rop, ????)));
}
}
....


public string DoSomething(str ing A, string B)
{
return string.Format(" {0}='{1}'",A,B) ;
}
public string DoSomething(str ing A, int B)
{
return string.Format(" {0}={1}",A,B.To String());
}

[Jon Skeet [C# MVP]]

Re: Reflection Values

Roger Webb <rwebb@nos.twia .org> wrote:[color=blue]
> I've got a class that I'm trying to get a listing of the properties...ki nda
> like one of the Reflection examples from Microsoft. However, unlike their
> example, I need to get the value as well. And am having trouble
> understanding how the GetValue() function of the PropertyInfo should be
> setup as below.[/color]

The call to prop.GetValue should be

prop.GetValue (LocalClass1, null);

However, your class LocalClass doesn't actually have any properties, as
you've written it - it has two fields instead.
[color=blue]
> Also, with it coming back as an object, is there a way to get it recast so
> that the DoSomething function will work?[/color]

Yes - cast it to string.

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too

[Roger Webb]

Re: Reflection Values

> The call to prop.GetValue should be[color=blue]
>
> prop.GetValue (LocalClass1, null);[/color]

That was it.
[color=blue]
>
> However, your class LocalClass doesn't actually have any properties, as
> you've written it - it has two fields instead.[/color]

Yeah.. That was because it was a quick example... Didnt create it exactly
right. My Bad. But, Thanks... I was missing the concept the the First
Parameter was the class that the property belonged to.
[color=blue][color=green]
> > Also, with it coming back as an object, is there a way to get it recast[/color][/color]
so[color=blue][color=green]
> > that the DoSomething function will work?[/color]
>
> Yes - cast it to string.
>[/color]

I can believe that, however How can you cast it as .. whatever is was... for
example...

DoSomething(pro p.Name, (???) prop.GetValue(L ocalClass1, null)));

What would you put here ... that would be "String" in the first case hence
casting the Property as a String.... and an "int" in the second case,
casting that property as an int... so that it will use the appropriate
overloaded method.

Filling that casting spot with prop. something give a compile error.

- Roger

[Nicholas Paldino [.NET/C# MVP]]

Re: Reflection Values

Roger,

You can't do it. You would need to have a large switch statement based
on type (or the name of the type, rather), which would output the values you
want based on type, or, you could just call the ToString method on the
object, and it will return something (the value, in some cases, otherwise,
usually just the type name).

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Roger Webb" <rwebb@nos.twia .org> wrote in message
news:uVIXTwr5EH A.828@TK2MSFTNG P14.phx.gbl...[color=blue][color=green]
>> The call to prop.GetValue should be
>>
>> prop.GetValue (LocalClass1, null);[/color]
>
> That was it.
>[color=green]
>>
>> However, your class LocalClass doesn't actually have any properties, as
>> you've written it - it has two fields instead.[/color]
>
> Yeah.. That was because it was a quick example... Didnt create it exactly
> right. My Bad. But, Thanks... I was missing the concept the the First
> Parameter was the class that the property belonged to.
>[color=green][color=darkred]
>> > Also, with it coming back as an object, is there a way to get it recast[/color][/color]
> so[color=green][color=darkred]
>> > that the DoSomething function will work?[/color]
>>
>> Yes - cast it to string.
>>[/color]
>
> I can believe that, however How can you cast it as .. whatever is was...
> for
> example...
>
> DoSomething(pro p.Name, (???) prop.GetValue(L ocalClass1, null)));
>
> What would you put here ... that would be "String" in the first case hence
> casting the Property as a String.... and an "int" in the second case,
> casting that property as an int... so that it will use the appropriate
> overloaded method.
>
> Filling that casting spot with prop. something give a compile error.
>
> - Roger
>
>[/color]

[Jon Skeet [C# MVP]]

Re: Reflection Values

Roger Webb <rwebb@nos.twia .org> wrote:[color=blue][color=green]
> > The call to prop.GetValue should be
> >
> > prop.GetValue (LocalClass1, null);[/color]
>
> That was it.[/color]

Goodo.
[color=blue][color=green][color=darkred]
> > > Also, with it coming back as an object, is there a way to get it recast[/color][/color]
> so[color=green][color=darkred]
> > > that the DoSomething function will work?[/color]
> >
> > Yes - cast it to string.
> >[/color]
>
> I can believe that, however How can you cast it as .. whatever is was... for
> example...
>
> DoSomething(pro p.Name, (???) prop.GetValue(L ocalClass1, null)));[/color]

Ah, you can't do that.

You'll need to know ahead of time which overload to use... *or*
possibly use reflection to find the right method and invoke it as well.

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too