//���幹��������ʼ���й���Դ�ͷ��й���Դ
public FileDealer(IntPtr handle, ManagedRes res)
{
fileHandle = handle;
managedRes = res;
}
//定义构造器，初始化托管资源和非托管资源
public FileDealer(IntPtr handle, ManagedRes res)
{
fileHandle = handle;
managedRes = res;
}