Unable to invoking method via reflection

[cartoper@gmail.com]

I am currently doing some R&D. The objective is to learn how to invoke
methods via reflection using the InvokeMember method. The InvokeMember
method throws an exception:

Method 'ReflectionTest .Originator.Add ToA' not found.

Here is the code:

using System;
using System.Diagnost ics;
using System.Collecti ons.Generic;
using System.Reflecti on;
using System.Text;

namespace ReflectionTest
{
public class Originator
{
private int a;

public Originator(int a)
{
this.a = a;
}

public int AddToA(int value)
{
a += value;
return a;
}
}

public class Program
{
static void Main(string[] args)
{
object obj = new Originator(5);

BindingFlags flags =
BindingFlags.Pu blic |
BindingFlags.In vokeMethod |
BindingFlags.In stance;

object result = obj.GetType().I nvokeMember(
"AddToA", flags, null, obj, new object[] { "5" });

Debug.WriteLine (result.ToStrin g());
}
}
}

[Jon Skeet [C# MVP]]

Re: Unable to invoking method via reflection

<cartoper@gmail .com> wrote:[color=blue]
> I am currently doing some R&D. The objective is to learn how to invoke
> methods via reflection using the InvokeMember method. The InvokeMember
> method throws an exception:[/color]

<snip>
[color=blue]
> public int AddToA(int value)[/color]

<snip>
[color=blue]
> object result = obj.GetType().I nvokeMember(
> "AddToA", flags, null, obj, new object[] { "5" });[/color]

You're effectively trying to call AddToA("5").

"5" is not an int, it's a string. If you change "5" to 5, the code
works.

--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[chris martin]

Re: Unable to invoking method via reflection

> I am currently doing some R&D. The objective is to learn how to[color=blue]
> invoke methods via reflection using the InvokeMember method. The
> InvokeMember method throws an exception:
>
> Method 'ReflectionTest .Originator.Add ToA' not found.
>
> Here is the code:
>
> using System;
> using System.Diagnost ics;
> using System.Collecti ons.Generic;
> using System.Reflecti on;
> using System.Text;
> namespace ReflectionTest
> {
> public class Originator
> {
> private int a;
> public Originator(int a)
> {
> this.a = a;
> }
> public int AddToA(int value)
> {
> a += value;
> return a;
> }
> }
> public class Program
> {
> static void Main(string[] args)
> {
> object obj = new Originator(5);
> BindingFlags flags =
> BindingFlags.Pu blic |
> BindingFlags.In vokeMethod |
> BindingFlags.In stance;
> object result = obj.GetType().I nvokeMember(
> "AddToA", flags, null, obj, new object[] { "5" });
> Debug.WriteLine (result.ToStrin g());
> }
> }
> }[/color]


Changing the line:
object result = obj.GetType().I nvokeMember(
"AddToA", flags, null, obj, new object[] { "5" });

to
object result = obj.GetType().I nvokeMember(
"AddToA", flags, null, obj, new object[] { 5 });

should do it. I didn't test it though.

[Mattias Sjögren]

Re: Unable to invoking method via reflection

>Method 'ReflectionTest .Originator.Add ToA' not found.
....[color=blue]
> object result = obj.GetType().I nvokeMember(
> "AddToA", flags, null, obj, new object[] { "5" });[/color]

The argument you're providing is a string so it will look for a
AddToA(string) method, not your AddToA(int). Try changing "5" to 5.


Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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