c#操作海康相机报错Enumerate devices fail!

int nRet = MyCamera.MV_CC_EnumDevices_NET(MyCamera.MV_GIGE_DEVICE | MyCamera.MV_USB_DEVICE, ref m_stDeviceList);
if (0 != nRet)
{
ShowErrorMsg("Enumerate devices fail!", 0);
return false;
}//GEV: Hikrobot MV-CA

vs2019 ,调试-》调试属性-》生成-》目标平台，x64即可