Pass from C# (framework 1.1) array of delegates to unmanaged DLL as array of function pointers

[verpeter]

When try pass only one delegate as parameter, all work fine.
But I need call function, that take as parameter array of function
pointers. From C++ code I used such code:

static void* aFuncPtrs[] =
{
&Function1,
&Function2,
&Function3,
};
UnmanagedFuncti on( aFuncPtrs );

How can I do same in C# ? I try next (suppose all methods have same
prototype ):

delegate void UnmanagedFuncti onDelegate();
void Function1(){};
void Function2(){};
void Function3(){};

[DllImport(...)]
private static extern void UnmanagedFuncti on(
[MarshalAs(Unman agedType.LPArra y,
ArraySubType=Un managedType.Fun ctionPtr)]
UnmanagedFuncti onDelegate[] v_aFunctions );

UnmanagedFuncti onDelegate[] aFuncPtrs=
{
new UnmanagedFuncti onDelegate( Function1 ),
new UnmanagedFuncti onDelegate( Function2 ),
new UnmanagedFuncti onDelegate( Function3 )
};
UnmanagedFuncti on( aFuncPtrs );

But this not work (access violation). Using ClrSpy I see:

"Marshaling from UnmanagedFuncti onDelegate[] to native array of
IUnknown * (size not specified by a parameter) in method
UnmanagedFuncti on."

In same time if try pass only one delegate (thats work fine), ClrSpy
show:

"Marshaling from UnmanagedFuncti onDelegate to Delegate in method
UnmanagedFuncti on2."

How say C# to marshal array items as Delegate, not IUnknown * ?