Autocad.net保存复杂对象

Question

我正在使用c#在AutoCAD中进行一个项目，我的应用程序数据存储在复杂的对象中(字符串，双精度，objectId，数组，列表…)，我想保存数据以供以后使用(序列化或保存在AutoCAD绘图中)，如果我重新打开AutoCAD并重新加载我的项目，我可以在我的对象

中找到所有数据Sorry for my English

Answer 1

所以你需要使用XData

详细信息和示例https://www.keanw.com/2007/04/adding_xdata_to.html

Answer 2

你可以将你的类序列化成二进制流，然后你可以将它保存为一堆二进制块(参见本主题)

但是大多数时候你应该直接将数据存储在DBDictionary的Xrecords中。

public abstract class RecordableObject
{
protected ObjectId dictionaryId;
protected Database database;
public string Key { get; }
protected RecordableObject(string key, Database db = null)
{
database = db ?? HostApplicationServices.WorkingDatabase;
Key = key;
using (var tr = database.TransactionManager.StartOpenCloseTransaction())
{
var NOD = (DBDictionary)tr.GetObject(database.NamedObjectsDictionaryId, OpenMode.ForRead);
DBDictionary dictionary;
if (NOD.Contains(Key))
{
dictionaryId = NOD.GetAt(Key);
}
else
{
NOD.UpgradeOpen();
dictionary = new DBDictionary();
dictionaryId = NOD.SetAt(Key, dictionary);
tr.AddNewlyCreatedDBObject(dictionary, true);
}
tr.Commit();
}
}
public abstract void SavePropertiesToDictionary();
public abstract void SetPropertiesFromDictionary();
protected void SaveData(string key, params TypedValue[] values)
{
using (var tr = database.TransactionManager.StartOpenCloseTransaction())
{
var dictionary = (DBDictionary)tr.GetObject(dictionaryId, OpenMode.ForRead);
Xrecord xrecord;
if (dictionary.Contains(key))
{
xrecord = (Xrecord)tr.GetObject(dictionary.GetAt(key), OpenMode.ForWrite);
}
else
{
xrecord = new Xrecord();
dictionary.UpgradeOpen();
dictionary.SetAt(key, xrecord);
tr.AddNewlyCreatedDBObject(xrecord, true);
}
xrecord.Data = new ResultBuffer(values);
tr.Commit();
}
}
protected T GetData<T>(string key)
{
using (var tr = database.TransactionManager.StartOpenCloseTransaction())
{
var dictionary = (DBDictionary)tr.GetObject(dictionaryId, OpenMode.ForRead);
if (dictionary.Contains(key))
{
var xrecord = (Xrecord)tr.GetObject(dictionary.GetAt(key), OpenMode.ForRead);
if (xrecord.Data != null)
return (T)xrecord.Data.AsArray()[0].Value;
}
return default;
}
}
protected T[] GetDataArray<T>(string key)
{
using(var tr = database.TransactionManager.StartOpenCloseTransaction())
{
var dictionary = (DBDictionary)tr.GetObject(dictionaryId, OpenMode.ForRead);
if (dictionary.Contains(key))
{
var xrecord = (Xrecord)tr.GetObject(dictionary.GetAt(key), OpenMode.ForRead);
if (xrecord.Data != null)
return xrecord.Data.AsArray().Select(tv => (T)tv.Value).ToArray();
}
return default;
}
}
}

派生类示例:

public class RecordableExample : RecordableObject
{
public double Size { get; set; }
public ObjectId ObjectId { get; set; }
public int[] Ints { get; set; }
public RecordableExample(string key, Database db = null) : base(key, db) { }
public override void SavePropertiesToDictionary()
{
SaveData(nameof(Size), new TypedValue((int)DxfCode.Real, Size));
SaveData(nameof(ObjectId), new TypedValue((int)DxfCode.Handle, ObjectId.Handle));
if (Ints != null)
SaveData(nameof(Ints), Ints.Select(i => new TypedValue((int)DxfCode.Int32, i)).ToArray());
}
public override void SetPropertiesFromDictionary()
{
Size = GetData<double>(nameof(Size));
Ints = GetDataArray<int>(nameof(Ints));
var handle = new Handle(Convert.ToInt64(GetData<string>(nameof(ObjectId))));
if (database.TryGetObjectId(handle, out var id)) 
ObjectId = id;
}
}