Hi,
The attached C# file demonstrates a small problem we currently encountered
using IronPython 2.7.4:
We have a C# method which has two overloads - one is parameterless, and the
other one has a single out parameter.
For non-generic methods, it is possible to call both variants when calling with
and without clr.Reference, but this does not work for generic methods.
When trying to call the parameterless generic method directly, the following
exception appears:
Microsoft.Scripting.ArgumentTypeException was unhandled
HResult=-2146233088
Message=Multiple targets could match: Method(), Method()
Source=Microsoft.Dynamic
StackTrace:
[snipped]
The workaround is to use the .Overloads[] syntax:
print instance.Method[str].Overloads[()]()
Btw, trying "print instance.Method[str].Overloads[int]()" leads to the
following funny ArgumentTypeException: "Method() takes at least 2147483647
arguments (0 given)"
Best regards
Markus Schaber
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namespace AmbigousCall
{
using System;
using IronPython.Hosting;
using Microsoft.Scripting.Hosting;
class Program
{
const string SRC = @"
import clr
print instance.Plain()
print instance.Plain(clr.Reference[int]())
print instance.Method[str](clr.Reference[int]())
print instance.Method[str]()
";
static void Main(string[] args)
{
ScriptEngine engine = Python.CreateEngine();
ScriptScope mainScope = engine.CreateScope();
mainScope.SetVariable("instance", new TwoMinded());
engine.Execute(SRC, mainScope);
Console.ReadLine();
}
}
public class TwoMinded
{
public int Plain() { return 1; }
public int Plain(out int anotherInt)
{
anotherInt = 2;
return 3;
}
public T Method<T>() { return default(T); }
public T Method<T>(out int anotherInt)
{
anotherInt = 0;
return default(T);
}
}
}
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