I need some DLR help. I am implementing an IDynamicMetaObjectProvider and DynamicMetaObject but I am having some issues getting the expected return type. I am overiding BindInvokeMember in the metaobject, I can see all the args types but no return type. Anyone know how I get to it if possible? I know the return type is dynamic but what if the thing you are invoking is dependent on a return type. I don't know which action to perform in the DynamicMetaObject unless I know the return type the consumer is expecting.
Update Two
I cant paste my actual code here since it calls all kinds of work stuff. Some sample dynamic object code is below.
public class TestDynamicMetaObject : DynamicMetaObject
{
public TestDynamicMetaObject(Expression expression, object value)
: base (expression, BindingRestrictions.Empty, value)
{
}
public override DynamicMetaObject BindInvokeMember(InvokeMemberBinder binder, DynamicMetaObject[] args)
{
Delegate method = new Func<int>(Test);
return new DynamicMetaObject(
Expression.Call(method.Method),
BindingRestrictions.GetInstanceRestriction(Expression,Value),
Value
);
}
public static int Test()
{
return 10;
}
}
public class TestDynamicObject : IDynamicMetaObjectProvider
{
DynamicMetaObject IDynamicMetaObjectProvider.GetMetaObject(Expression parameter)
{
return new TestDynamicMetaObject(parameter, this);
}
}
Here is where I am using.
static void Main(string[] args)
{
try
{
dynamic x = new TestDynamicObject();
int gg= x.Test();
Console.WriteLine(gg);
}
catch (Exception excep)
{
Console.WriteLine(excep);
}
Console.ReadLine();
}
Here is the code that the compiler creates.
private static void Main(string[] args)
{
try
{
object x = new TestDynamicObject();
if (<Main>o__SiteContainer0.<>p__Site1 == null)
{
<Main>o__SiteContainer0.<>p__Site1 = CallSite<Func<CallSite, object, int>>.Create(new CSharpConvertBinder(typeof(int), CSharpConversionKind.ImplicitConversion, false));
}
if (<Main>o__SiteContainer0.<>p__Site2 == null)
{
<Main>o__SiteContainer0.<>p__Site2 = CallSite<Func<CallSite, object, object>>.Create(new CSharpInvokeMemberBinder(CSharpCallFlags.None, "Test", typeof(Program), null, new CSharpArgumentInfo[] { new CSharpArgumentInfo(CSharpArgumentInfoFlags.None, null) }));
}
Console.WriteLine(<Main>o__SiteContainer0.<>p__Site1.Target(<Main>o__SiteContainer0.<>p__Site1, <Main>o__SiteContainer0.<>p__Site2.Target(<Main>o__SiteContainer0.<>p__Site2, x)));
}
catch (Exception excep)
{
Console.WriteLine(excep);
}
Console.ReadLine();
}