Calling a C# method with a byref parameter

Hi Everyone,

I’m trying to write a IronRuby script that interops with a a .NET
assembly
written in C#.

It has a class that derives from a base class in the .NET assembly. One
of
the base class protected methods looks like this:

protected void OnNotifyPropertyChanged(string name, ref T
localmember, T
value)
{

}

I can’t for the life of me figure out how to call this method from IR in
my
derived class.
The documentation mentions that you can call *out *parameters without
using
them as arguments, but I can’t seem to find anything about *ref *params.

If I just try calling the method like this:

OnNotifyPropertyChanged(property_name, value, value)

I get this error:

Microsoft.Scripting.Core:0:in `Bind’: Expression of type
'IronRuby.Builtins.Muta

bleString&’ cannot be used for parameter of type
'IronRuby.Builtins.MutableStrin

g’ of method 'Void
#base#OnNotifyPropertyChanged[MutableString](System.String, I

ronRuby.Builtins.MutableString ByRef, IronRuby.Builtins.MutableString)’
(Argumen

tError)

  •    from Microsoft.Scripting.Core:0:in `BindCore'*
    
  •    from ./dynamic_event_item.rb:22:in `method_missing'*
    
  •    from :0*
    

Am I missing something?

Thanks

Michael E.

It returns another return value with the new ref value.

For example, if you have the next c# class:
public class Class1
{
public string DoSomething(ref string test)
{
test = test + “tamtamtam”;

    return "return value";
}

}

This is the IronRuby code you can write to use it:

require ‘c:\dev\TestApps\TestClass\TestClass\bin\Debug\TestClass.dll’
=> true

c = Class1.new
=> TestClass.Class1

str = “hello”
=> “hello”

result = c.do_something(str)
=> [‘return value’, ‘hellotamtamtam’]

Pay attention that the result variable is an array that contains the
method
return value as the first item and the ref value as the second
parameter.

Shay.

Shay F. | .NET Technologies Expert | Author of IronRuby Unleashed
|
Sela Technology Center
Blog: http://IronShay.com | Twitter: http://twitter.com/ironshay

On Thu, Feb 11, 2010 at 3:44 PM, Michael E.

Thanks Shay.

OK your code works. But my trouble seems to come in with the Generic
method.

When I do:

public class Class1
{
public string DoSomething(ref string test)
{
test = test + “tamtamtam”;

        return "return value";
    }

    public string DoSomethingElse<T>(ref T test)
    {
        return test.ToString();
    }
}

and then call it from IR:

c = TestClass::Class1.new
=> TestClass.Class1

c.do_something(“Bla”)
=> [‘return value’, ‘Blatamtamtam’]

c.do_something_else(“Bla”)
Microsoft.Scripting.Core:0:in Bind': Expression of type 'IronRuby.Builtins.Muta bleString&' cannot be used for parameter of type 'IronRuby.Builtins.MutableStrin g' of method 'System.String DoSomethingElse[MutableString](IronRuby.Builtins.Mut ableString ByRef)' (ArgumentError) from Microsoft.Scripting.Core:0:inBindCore’
from :0

You should call generic methods a bit differently.

The next code works:
ret_val = c.method(:do_something_else).of(String).call(str)

Shay.

Shay F. | .NET Technologies Expert | Author of IronRuby Unleashed
|
Sela Technology Center
Blog: http://IronShay.com | Twitter: http://twitter.com/ironshay

On Thu, Feb 11, 2010 at 4:44 PM, Michael E.

That call actually should (usually) be able to infer the type. Please
file a bug on codeplex that Generic Type inference isn’t working with
ByRef types.

JD

From: [email protected]
[mailto:[email protected]] On Behalf Of Shay F.
Sent: Thursday, February 11, 2010 6:53 AM
To: [email protected]
Subject: Re: [Ironruby-core] Calling a C# method with a byref parameter

You should call generic methods a bit differently.

The next code works:
ret_val = c.method(:do_something_else).of(String).call(str)

Shay.

Shay F. | .NET Technologies Expert | Author of IronRuby Unleashed
| Sela Technology Center
Blog: http://IronShay.com | Twitter: http://twitter.com/ironshay

On Thu, Feb 11, 2010 at 4:44 PM, Michael E.
<[email protected]mailto:[email protected]> wrote:
Thanks Shay.

OK your code works. But my trouble seems to come in with the Generic
method.

When I do:

public class Class1
{
public string DoSomething(ref string test)
{
test = test + “tamtamtam”;

        return "return value";
    }

    public string DoSomethingElse<T>(ref T test)
    {
        return test.ToString();
    }
}

and then call it from IR:

c = TestClass::Class1.new
=> TestClass.Class1

c.do_something(“Bla”)
=> [‘return value’, ‘Blatamtamtam’]

c.do_something_else(“Bla”)
Microsoft.Scripting.Core:0:in Bind': Expression of type 'IronRuby.Builtins.Muta bleString&' cannot be used for parameter of type 'IronRuby.Builtins.MutableStrin g' of method 'System.String DoSomethingElse[MutableString](IronRuby.Builtins.Mut ableString ByRef)' (ArgumentError) from Microsoft.Scripting.Core:0:inBindCore’
from :0

On Thu, Feb 11, 2010 at 4:12 PM, Shay F.
<[email protected]mailto:[email protected]> wrote:
It returns another return value with the new ref value.

For example, if you have the next c# class:
public class Class1
{
public string DoSomething(ref string test)
{
test = test + “tamtamtam”;

    return "return value";
}

}

This is the IronRuby code you can write to use it:

require ‘c:\dev\TestApps\TestClass\TestClass\bin\Debug\TestClass.dll’
=> true

c = Class1.new
=> TestClass.Class1

str = “hello”
=> “hello”

result = c.do_something(str)
=> [‘return value’, ‘hellotamtamtam’]

Pay attention that the result variable is an array that contains the
method return value as the first item and the ref value as the second
parameter.

Shay.

Shay F. | .NET Technologies Expert | Author of IronRuby Unleashed
| Sela Technology Center
Blog: http://IronShay.com | Twitter: http://twitter.com/ironshay

On Thu, Feb 11, 2010 at 3:44 PM, Michael E.
<[email protected]mailto:[email protected]> wrote:
Hi Everyone,

I’m trying to write a IronRuby script that interops with a a .NET
assembly written in C#.

It has a class that derives from a base class in the .NET assembly. One
of the base class protected methods looks like this:

protected void OnNotifyPropertyChanged(string name, ref T
localmember, T value)
{

}

I can’t for the life of me figure out how to call this method from IR in
my derived class.
The documentation mentions that you can call out parameters without
using them as arguments, but I can’t seem to find anything about ref
params.

If I just try calling the method like this:

OnNotifyPropertyChanged(property_name, value, value)

I get this error:

Microsoft.Scripting.Core:0:in Bind': Expression of type 'IronRuby.Builtins.Muta bleString&' cannot be used for parameter of type 'IronRuby.Builtins.MutableStrin g' of method 'Void #base#OnNotifyPropertyChanged[MutableString](System.String, I ronRuby.Builtins.MutableString ByRef, IronRuby.Builtins.MutableString)' (Argumen tError) from Microsoft.Scripting.Core:0:inBindCore’
from ./dynamic_event_item.rb:22:in `method_missing’
from :0

Am I missing something?

Thanks

Michael E.


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core

On what types will IR be able to infer the types? Is that documented on
the
site and I just didn’t see it?

Ryan R.

Ok, thanks Jim.

I have filed a bug here:

http://ironruby.codeplex.com/WorkItem/View.aspx?WorkItemId=3934

http://ironruby.codeplex.com/WorkItem/View.aspx?WorkItemId=3934I also
noticed that event when using the form

method(:name).Of(String).Call(param)

If you’re calling a protected method from a derived class like this
you’ll
get a ArgumentError.

Generic type inference should work like it does in C#. I’ll get some
more tests in there and get Jimmy to update the docs.

JD

From: [email protected]
[mailto:[email protected]] On Behalf Of Ryan R.
Sent: Thursday, February 11, 2010 9:56 AM
To: [email protected]
Subject: Re: [Ironruby-core] Calling a C# method with a byref parameter

On what types will IR be able to infer the types? Is that documented on
the site and I just didn’t see it?

Ryan R.

On Thu, Feb 11, 2010 at 9:55 AM, Jim D.
<[email protected]mailto:[email protected]> wrote:
That call actually should (usually) be able to infer the type. Please
file a bug on codeplex that Generic Type inference isn’t working with
ByRef types.

JD

From:
[email protected]mailto:[email protected]
[mailto:[email protected]mailto:[email protected]]
On Behalf Of Shay F.
Sent: Thursday, February 11, 2010 6:53 AM
To: [email protected]mailto:[email protected]
Subject: Re: [Ironruby-core] Calling a C# method with a byref parameter

You should call generic methods a bit differently.

The next code works:
ret_val = c.method(:do_something_else).of(String).call(str)

Shay.

Shay F. | .NET Technologies Expert | Author of IronRuby Unleashed
| Sela Technology Center
Blog: http://IronShay.com | Twitter: http://twitter.com/ironshay
On Thu, Feb 11, 2010 at 4:44 PM, Michael E.
<[email protected]mailto:[email protected]> wrote:
Thanks Shay.

OK your code works. But my trouble seems to come in with the Generic
method.

When I do:

public class Class1
{
public string DoSomething(ref string test)
{
test = test + “tamtamtam”;

        return "return value";
    }

    public string DoSomethingElse<T>(ref T test)
    {
        return test.ToString();
    }
}

and then call it from IR:

c = TestClass::Class1.new
=> TestClass.Class1

c.do_something(“Bla”)
=> [‘return value’, ‘Blatamtamtam’]

c.do_something_else(“Bla”)
Microsoft.Scripting.Core:0:in Bind': Expression of type 'IronRuby.Builtins.Muta bleString&' cannot be used for parameter of type 'IronRuby.Builtins.MutableStrin g' of method 'System.String DoSomethingElse[MutableString](IronRuby.Builtins.Mut ableString ByRef)' (ArgumentError) from Microsoft.Scripting.Core:0:inBindCore’
from :0

On Thu, Feb 11, 2010 at 4:12 PM, Shay F.
<[email protected]mailto:[email protected]> wrote:
It returns another return value with the new ref value.

For example, if you have the next c# class:
public class Class1
{
public string DoSomething(ref string test)
{
test = test + “tamtamtam”;

    return "return value";
}

}

This is the IronRuby code you can write to use it:

require ‘c:\dev\TestApps\TestClass\TestClass\bin\Debug\TestClass.dll’
=> true

c = Class1.new
=> TestClass.Class1

str = “hello”
=> “hello”

result = c.do_something(str)
=> [‘return value’, ‘hellotamtamtam’]

Pay attention that the result variable is an array that contains the
method return value as the first item and the ref value as the second
parameter.

Shay.

Shay F. | .NET Technologies Expert | Author of IronRuby Unleashed
| Sela Technology Center
Blog: http://IronShay.com | Twitter: http://twitter.com/ironshay
On Thu, Feb 11, 2010 at 3:44 PM, Michael E.
<[email protected]mailto:[email protected]> wrote:
Hi Everyone,

I’m trying to write a IronRuby script that interops with a a .NET
assembly written in C#.

It has a class that derives from a base class in the .NET assembly. One
of the base class protected methods looks like this:

protected void OnNotifyPropertyChanged(string name, ref T
localmember, T value)
{

}

I can’t for the life of me figure out how to call this method from IR in
my derived class.
The documentation mentions that you can call out parameters without
using them as arguments, but I can’t seem to find anything about ref
params.

If I just try calling the method like this:

OnNotifyPropertyChanged(property_name, value, value)

I get this error:

Microsoft.Scripting.Core:0:in Bind': Expression of type 'IronRuby.Builtins.Muta bleString&' cannot be used for parameter of type 'IronRuby.Builtins.MutableStrin g' of method 'Void #base#OnNotifyPropertyChanged[MutableString](System.String, I ronRuby.Builtins.MutableString ByRef, IronRuby.Builtins.MutableString)' (Argumen tError) from Microsoft.Scripting.Core:0:inBindCore’
from ./dynamic_event_item.rb:22:in `method_missing’
from :0

Am I missing something?

Thanks

Michael E.


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core

About documentation, the bottom of
http://ironpython.net/documentation/dotnet/ has this placeholder :frowning:

Appendix - Rules for Type parameter inference while invoking generic 

methods
TODO

Jim, Dino had added tests for IronPython, and you should be able to
leverage those for IronRuby

http://ironruby.codeplex.com/WorkItem/View.aspx?WorkItemId=3395 also
tracks the issues with generic inference.


From: [email protected]
[[email protected]] on behalf of Jim D.
[[email protected]]
Sent: Friday, February 12, 2010 9:06 AM
To: [email protected]
Subject: Re: [Ironruby-core] Calling a C# method with a byref parameter

Generic type inference should work like it does in C#. I’ll get some
more tests in there and get Jimmy to update the docs.

JD

From: [email protected]
[mailto:[email protected]] On Behalf Of Ryan R.
Sent: Thursday, February 11, 2010 9:56 AM
To: [email protected]
Subject: Re: [Ironruby-core] Calling a C# method with a byref parameter

On what types will IR be able to infer the types? Is that documented on
the site and I just didn’t see it?

Ryan R.

On Thu, Feb 11, 2010 at 9:55 AM, Jim D.
<[email protected]mailto:[email protected]> wrote:
That call actually should (usually) be able to infer the type. Please
file a bug on codeplex that Generic Type inference isn’t working with
ByRef types.

JD

From:
[email protected]mailto:[email protected]
[mailto:[email protected]mailto:[email protected]]
On Behalf Of Shay F.
Sent: Thursday, February 11, 2010 6:53 AM
To: [email protected]mailto:[email protected]
Subject: Re: [Ironruby-core] Calling a C# method with a byref parameter

You should call generic methods a bit differently.

The next code works:
ret_val = c.method(:do_something_else).of(String).call(str)

Shay.

Shay F. | .NET Technologies Expert | Author of IronRuby Unleashed
| Sela Technology Center
Blog: http://IronShay.com | Twitter: http://twitter.com/ironshay
On Thu, Feb 11, 2010 at 4:44 PM, Michael E.
<[email protected]mailto:[email protected]> wrote:
Thanks Shay.

OK your code works. But my trouble seems to come in with the Generic
method.

When I do:

public class Class1
{
public string DoSomething(ref string test)
{
test = test + “tamtamtam”;

        return "return value";
    }

    public string DoSomethingElse<T>(ref T test)
    {
        return test.ToString();
    }
}

and then call it from IR:

c = TestClass::Class1.new
=> TestClass.Class1

c.do_something(“Bla”)
=> [‘return value’, ‘Blatamtamtam’]

c.do_something_else(“Bla”)
Microsoft.Scripting.Core:0:in Bind': Expression of type 'IronRuby.Builtins.Muta bleString&' cannot be used for parameter of type 'IronRuby.Builtins.MutableStrin g' of method 'System.String DoSomethingElse[MutableString](IronRuby.Builtins.Mut ableString ByRef)' (ArgumentError) from Microsoft.Scripting.Core:0:inBindCore’
from :0

On Thu, Feb 11, 2010 at 4:12 PM, Shay F.
<[email protected]mailto:[email protected]> wrote:
It returns another return value with the new ref value.

For example, if you have the next c# class:
public class Class1
{
public string DoSomething(ref string test)
{
test = test + “tamtamtam”;

    return "return value";
}

}

This is the IronRuby code you can write to use it:

require ‘c:\dev\TestApps\TestClass\TestClass\bin\Debug\TestClass.dll’
=> true

c = Class1.new
=> TestClass.Class1

str = “hello”
=> “hello”

result = c.do_something(str)
=> [‘return value’, ‘hellotamtamtam’]

Pay attention that the result variable is an array that contains the
method return value as the first item and the ref value as the second
parameter.

Shay.

Shay F. | .NET Technologies Expert | Author of IronRuby Unleashed
| Sela Technology Center
Blog: http://IronShay.com | Twitter: http://twitter.com/ironshay
On Thu, Feb 11, 2010 at 3:44 PM, Michael E.
<[email protected]mailto:[email protected]> wrote:
Hi Everyone,

I’m trying to write a IronRuby script that interops with a a .NET
assembly written in C#.

It has a class that derives from a base class in the .NET assembly. One
of the base class protected methods looks like this:

protected void OnNotifyPropertyChanged(string name, ref T
localmember, T value)
{

}

I can’t for the life of me figure out how to call this method from IR in
my derived class.
The documentation mentions that you can call out parameters without
using them as arguments, but I can’t seem to find anything about ref
params.

If I just try calling the method like this:

OnNotifyPropertyChanged(property_name, value, value)

I get this error:

Microsoft.Scripting.Core:0:in Bind': Expression of type 'IronRuby.Builtins.Muta bleString&' cannot be used for parameter of type 'IronRuby.Builtins.MutableStrin g' of method 'Void #base#OnNotifyPropertyChanged[MutableString](System.String, I ronRuby.Builtins.MutableString ByRef, IronRuby.Builtins.MutableString)' (Argumen tError) from Microsoft.Scripting.Core:0:inBindCore’
from ./dynamic_event_item.rb:22:in `method_missing’
from :0

Am I missing something?

Thanks

Michael E.


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core


Ironruby-core mailing list
[email protected]mailto:[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core

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