C#<-->JScript: invisible array? - c#-4.0

Question

I have a bit of a complex program which is giving me this apparently phantom error...
I'll start explaining with the help of this little example program I rigged that can throw my beautiful exception for anyone who runs it.
<!-- language: c# -->
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
namespace so_redux {
static class Program {
[STAThread]
static void Main(){
CS2JS _class=new CS2JS();
}
}//class Program
class CS2JS{
public CS2JS(){
Func<String,Object> js_eval=initJS();
Object cs_ic=initCS();
string xc;
object res;
cs_ic.GetType().GetMethod("init").Invoke(cs_ic,null);
AppDomain.CurrentDomain.SetData("trespasser",cs_ic);
xc=#"function edata(fieldname:String,ival:String):Object{
var sob=System.AppDomain.CurrentDomain.GetData('trespasser');
var v1=sob.GetType().GetField(fieldname).GetValue(sob);
function HASH(s1:String,s2:String):Object{
var q1=sob.GetType().GetField(s1).GetValue(sob);
return q1.ITEM(s2);
}
var v2=v1.ITEM(ival);
return eval(v2);
}
edata('HT','foo');";
res=js_eval(xc);
// var xx;xx=new Hashtable();xx['sda']='1';eval(xx['sda']); OK
}
Func<String,Object> initJS(){
System.CodeDom.Compiler.CodeDomProvider jcc;
System.CodeDom.Compiler.CompilerParameters jcp;
System.CodeDom.Compiler.CompilerResults jcr;
System.Reflection.Assembly jas;
object jis;
string code;
Type t_ii;
code=#"#set #debug(off)
import System;
import System.Collections;
import System.Collections.Generic;
package internal_namespace{class internal_class{
public function internal_method(_code:String):Object{
return eval(_code);
}
}
}";
jcc=Microsoft.JScript.JScriptCodeProvider.CreateProvider("JScript");
jcp=new System.CodeDom.Compiler.CompilerParameters();
jcp.CompilerOptions="/fast-";
jcp.GenerateExecutable=false;
jcp.GenerateInMemory=true;
jcp.IncludeDebugInformation=false;
jcp.ReferencedAssemblies.Add("System.dll");
jcp.ReferencedAssemblies.Add("System.Core.dll");
jcp.WarningLevel=4;
jcr=jcc.CompileAssemblyFromSource(jcp,code);
jas=jcr.CompiledAssembly;
jis=jas.CreateInstance("internal_namespace.internal_class");
t_ii=jas.GetType("internal_namespace.internal_class");
return (s1)=>t_ii.InvokeMember("internal_method",System.Reflection.BindingFlags.InvokeMethod,null,jis,new object[]{s1});
}//initJS
Object initCS(){
var v1= Microsoft.CSharp.CSharpCodeProvider.CreateProvider("CSharp");
System.CodeDom.Compiler.CompilerParameters v2=new System.CodeDom.Compiler.CompilerParameters();
v2.GenerateExecutable=false;
v2.GenerateInMemory=true;
v2.IncludeDebugInformation=false;
v2.WarningLevel=4;
v2.ReferencedAssemblies.Add("System.dll");
v2.ReferencedAssemblies.Add("System.Core.dll");
string _code="public Hashtable2 HT;"+
"public void init(){"+
"HT=new Hashtable2();"+
"HT[\"foo\"]=\"1\";"+
"HT[\"bar\"]=\"HASH('HT','foo')\";"+
"}";
var v3="using System;using System.Collections;using System.Collections.Generic;"+
"namespace internal_namespace{public class Hashtable2:Hashtable{"+
"public Hashtable2():base(){} public Hashtable2(int N):base(N){}"+
"public Object ITEM(Object K){return this[K];} }"+
"[Serializable]public class internal_class{"+
"public internal_class(){}"+
_code+
"\n}}";
var v4=v1.CompileAssemblyFromSource(v2,v3);
var v5=v4.CompiledAssembly;
var v6=v5.GetType("internal_namespace.internal_class");
var v7=v5.CreateInstance("internal_namespace.internal_class");
return v7;
}//initCS
}//class CS2JS
}//namespace so_redux
The exception that is thrown is "index out of bounds", and it's thrown from JScript. The problem? It's that there is no array!
What this code is doing: first a JScript interpreter is initialized by compiling at runtime a class that "exports" an eval (one could do a dll, but in this case I didn't).
Then a C# assembly is compiled, an assembly that "exports" some user code (the variable _code in initCS is originally loaded by reading a text file).
After the initialization of the newly compiled class (the invoking of init()), I need the two assemblies (JScript and C#) to interact, so I need to pass data between them, and I thought of using AppDomain.
Note: in the C# assembly an Hashtable2 is defined because I put in there an ITEM method that one can use in alternative to the common property this[]: in this way debugging is easier (for examply by showing a holy MessageBox when accessing the values).
So, I pass the class instantiated in initCS to JScript, and JScript reads the internal Hashtable (HT). What I need to do is evaluate the data in the Hashtable, because it is supposed to be able to alter itself dynamically.
Everything works fine if I eval a string not taken from the Hashtable -- in the moment I take whatever is in the Hashtable and pass it to eval, then exceptions happen. Attention: the strings are absolutely the same (even comparing them with Equals) and they work, the difference is only from where they come from.
When the JScript function edata evals a string taken from the Hashtable, JScript says "index out of bounds", but as I was saying: I don't see any array there... (and maybe the problem is exactly that, dunno).
I admit I have my limitations in JScript, so if anybody could lend a hand to help understand WTF is going on, I would be really happy.

Answer 1

Temporary solution/workaround splitting the JScript function:
xc=#"function odata(fieldname:String,ival:String):Object{
var sob=System.AppDomain.CurrentDomain.GetData('trespasser');
var v1=sob.GetType().GetField(fieldname).GetValue(sob);
return v1.ITEM(ival);
}
odata('HT','bar');";
res=js_eval(xc);
xc=#"function HASH(s1:String,s2:String):Object{
var sob=System.AppDomain.CurrentDomain.GetData('trespasser');
var q1=sob.GetType().GetField(s1).GetValue(sob);
return q1.ITEM(s2);
}
eval("+res.ToString()+");";
res=js_eval(xc);
but if anybody really got any idea of why is wrong in the first example, please explain me!