autocad.net 图元名柄handle保存为string格式后再转换成objectid的函数

#region 将handle转换为objectid
/// <summary>
/// 将handle转换为objectid
/// </summary>
/// <param name="db">database</param>
/// <param name="handle">handle字符串</param>
/// <returns>ObjectId</returns>
public static ObjectId GetObjectId(this Database db, string handle)
{
Handle h = new Handle(Int64.Parse(handle, NumberStyles.AllowHexSpecifier));
ObjectId id = ObjectId.Null;
db.TryGetObjectId(h, out id);
return id;
}
#endregion