import numpy as np
import ctypes
import clr, System
from System import Array, Int32
from System.Runtime.InteropServices import GCHandle, GCHandleType
import sys
import os


_MAP_NP_NET = {
    np.dtype('float32'): System.Single,
    np.dtype('float64'): System.Double,
    np.dtype('int8')   : System.SByte,
    np.dtype('int16')  : System.Int16,
    np.dtype('int32')  : System.Int32,
    np.dtype('int64')  : System.Int64,
    np.dtype('uint8')  : System.Byte,
    np.dtype('uint16') : System.UInt16,
    np.dtype('uint32') : System.UInt32,
    np.dtype('uint64') : System.UInt64,
    np.dtype('bool')   : System.Boolean,
}

def asNetArray(npArray):
    dims = npArray.shape
    dtype = npArray.dtype

    netDims = Array.CreateInstance(Int32, npArray.ndim)
    for I in range(npArray.ndim):
        netDims[I] = int(dims[I])

    if not npArray.flags.c_contiguous:
        npArray = npArray.copy(order='C')
    assert npArray.flags.c_contiguous

    try:
        netArray = Array.CreateInstance(_MAP_NP_NET[dtype], netDims)
    except KeyError:
        raise NotImplementedError("asNetArray does not yet support dtype {}".format(dtype))

    try: # Memmove
        destHandle = GCHandle.Alloc(netArray, GCHandleType.Pinned)
        sourcePtr = npArray.__array_interface__['data'][0]
        destPtr = destHandle.AddrOfPinnedObject().ToInt64()
        ctypes.memmove(destPtr, sourcePtr, npArray.nbytes)
    finally:
        if destHandle.IsAllocated: destHandle.Free()
    return netArray

if __name__ == '__main__':
    foo = np.full([1024,1024], 2.5, dtype=np.int32)

    netFoo = asNetArray( foo )

Traceback (most recent call last):
  File "pythonnetUtils.py", line 53, in <module>
    netFoo = asNetArray( foo )
  File "pythonnetUtils.py", line 37, in asNetArray
    netArray = Array.CreateInstance(_MAP_NP_NET[dtype], netDims)
TypeError: No method matches given arguments for CreateInstance: (<class 'CLR.CLR Metatype'>, <class 'System.Int32[]'>)