在调用非托管类Windows.Graphics.Printing3D.dll时总是提示错误。

[weixin_38060280]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;


namespace WindowsFormsApplication7
{
[DllImport("Windows.Graphics.Printing3D.dll",
EntryPoint = "Print3DManager", SetLastError = true,
CharSet = CharSet.Unicode, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]

public static extern XXXXX
代码XXXX位置应该怎么写？
另外微软官方的例子使用了using Windows.Graphics.Printing3D;
那么托管DLL去哪里可以下到，在网上和