[Mono-bugs] [Bug 490932] New: Nullable ByRef types do not work correctly via reflection

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=490932


           Summary: Nullable ByRef types do not work correctly via
                    reflection
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: x86
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: CORLIB
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: joe at mistachkin.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.20)
Gecko/20081217 Firefox/2.0.0.20 (.NET CLR 3.5.30729)


using System;
using System.Reflection;

namespace BugDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            object[] margs = new object[1];
            int? x = null;
            int? y = 0;

            Console.WriteLine("x: \"{0}\", y: \"{1}\"", x, y);

            BindingFlags flags = BindingFlags.Public | BindingFlags.Static |
                BindingFlags.InvokeMethod;

            MethodInfo method = typeof(Program).GetMethod(
                "TestByRefNullableValueTypeMethod", flags);

            margs[0] = x;

            method.Invoke(null, margs);

            x = margs[0] as int?;

            margs[0] = y;

            method.Invoke(null, margs);

            y = margs[0] as int?;

            Console.WriteLine("x: \"{0}\", y: \"{1}\"", x, y);

            margs[0] = x;

            typeof(Program).InvokeMember(
                "TestByRefNullableValueTypeMethod",
                flags, null, null, margs);

            x = margs[0] as int?;

            margs[0] = y;

            typeof(Program).InvokeMember(
                "TestByRefNullableValueTypeMethod",
                flags, null, null, margs);

            y = margs[0] as int?;

            Console.WriteLine("x: \"{0}\", y: \"{1}\"", x, y);


            Console.ReadKey();
        }

        public static void TestByRefNullableValueTypeMethod(ref int? x)
        {
            if (x != null) x++;
            else x = 0;
        }
    }
}


Reproducible: Always

Steps to Reproduce:
Run the code listed above.

Actual Results:  
x: "", y: "0"
x: "", y: "0"

Unhandled Exception: System.MissingMethodException: The best match for method
TestByRefNullableValueTypeMethod has some invalid parameter.
  at System.MonoType.InvokeMember (System.String name, BindingFlags invokeAttr,
System.Reflection.Binder binder, System.Object target, System.Object[] args,
System.Reflection.ParameterModifier[] modifiers,
System.Globalization.CultureInfo culture, System.String[] namedParameters)
[0x00000]
  at System.Type.InvokeMember (System.String name, BindingFlags invokeAttr,
System.Reflection.Binder binder, System.Object target, System.Object[] args)
[0x00000]
  at BugDemo.Program.Main (System.String[] args) [0x00000]

Expected Results:  
x: "", y: "0"
x: "0", y: "1"
x: "1", y: "2"

The binary used was compiled with Visual Studio 2008 SP1.

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