/// <summary>
 /// 返信を投稿
 /// </summary>
 /// <param name="board"></param>
 /// <param name="data">投稿データ</param>
 public void PostResponse( BoardEntity board, BoardPostEntity data )
 {
     if ( board != null ) {
         board.Posts.Add( data );
         db_.SaveChanges();
     }
 }
 /// <summary>
 /// 返信を投稿
 /// </summary>
 /// <param name="id">掲示板ID</param>
 /// <param name="data">投稿データ</param>
 public void PostResponse( int id, BoardPostEntity data )
 {
     PostResponse( Find( id ), data );
 }