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,
};
UnmanagedFunction( aFuncPtrs );

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

delegate void UnmanagedFunctionDelegate();
void Function1(){};
void Function2(){};
void Function3(){};

[DllImport(...)]
private static extern void UnmanagedFunction(
[MarshalAs(UnmanagedType.LPArray,
ArraySubType=UnmanagedType.FunctionPtr)]
UnmanagedFunctionDelegate[] v_aFunctions );

UnmanagedFunctionDelegate[] aFuncPtrs=
{
new UnmanagedFunctionDelegate( Function1 ),
new UnmanagedFunctionDelegate( Function2 ),
new UnmanagedFunctionDelegate( Function3 )
};
UnmanagedFunction( aFuncPtrs );

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

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

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

"Marshaling from UnmanagedFunctionDelegate to Delegate in method
UnmanagedFunction2."

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