EF删除

 

EF 找出 ID为这个的，只删除一个

var device = await _context.Device.FindAsync(vDevice.RecordId);
if (device == null)
{
return NotFound();
}

EF 找出 序列号为这个的，全部删除 
var parts = _context.DeviceParts.Where(a => a.DeviceSerialNum == vDevice.SerialNumber).ToList();
if (parts == null || parts.Count == 0)
{
}
else
{
foreach (var item in parts)
{
_context.DeviceParts.Remove(item);
}
}