/// <summary>
/// 修改扩展字典中的数据。
/// </summary>
/// <param name="obj"></param>
/// <param name="act"></param>
/// <param name="key"></param>
/// <param name="db"></param>
public static void ModifyExtData(this DBObject obj, Action<DBObject> act,
string key, Database db = null)
{
db = db ?? Application.DocumentManager.MdiActiveDocument.Database;
var dataId = obj.GetExtData(key, db);
using (var trans = db.TransactionManager.StartTransaction())
{
var data = trans.GetObject(dataId, OpenMode.ForWrite);
act.Invoke(data);
}
}
