C#/AutoCAD 2018/ObjectArx/二次开发再说实体（六）
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1、获取模型空间中所有实体
#region "获取模型空间中所有实体"
/// <summary>
/// 获取模型空间中所有实体
/// </summary>
/// <param name=""></param>
/// <returns>实体ID的列表</returns>
public List<Autodesk.AutoCAD.DatabaseServices.ObjectId> GetEntitiesInModelSpace()
{
List<Autodesk.AutoCAD.DatabaseServices.ObjectId> objects =
new List<Autodesk.AutoCAD.DatabaseServices.ObjectId>();
using (Autodesk.AutoCAD.DatabaseServices.Transaction transaction =
Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.
MdiActiveDocument.TransactionManager.StartTransaction())
{
Autodesk.AutoCAD.DatabaseServices.BlockTable blockTable =
(Autodesk.AutoCAD.DatabaseServices.BlockTable)transaction.GetObject(
Autodesk.AutoCAD.DatabaseServices.HostApplicationServices.WorkingDatabase.BlockTableId,
Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead);
Autodesk.AutoCAD.DatabaseServices.BlockTableRecord blockTableRecord =
(Autodesk.AutoCAD.DatabaseServices.BlockTableRecord)transaction.GetObject(
blockTable[Autodesk.AutoCAD.DatabaseServices.BlockTableRecord.ModelSpace],
Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead);
foreach (Autodesk.AutoCAD.DatabaseServices.ObjectId objId in blockTableRecord)
{
objects.Add(objId);
}
transaction.Commit();
}
return objects;
}
#endregion
2、获取实体
#region "获取实体"
/// <summary>
/// 获取实体
/// </summary>
/// <param name="ObjectId"></param>
/// <returns>DBObject</returns>
private DBObject GetObject(ObjectId id)
{
DBObject obj = null;
using (Transaction transaction = Application.DocumentManager.
MdiActiveDocument.TransactionManager.StartTransaction())
{
obj = transaction.GetObject(id,
Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead, true);
transaction.Commit();
}
return obj;
}
#endregion
3、给实体添加XData
#region "如何给实体添加XData"
/// <summary>
/// 如何给实体添加XData
/// </summary>
/// <param name="DBObject，int"></param>
/// <returns>bool</returns>
public static bool AttachXData(DBObject obj, int MyData)
{
RegAppTableRecord app = new RegAppTableRecord();
app.Name = "云幽学院";
using (Transaction transaction =
Application.DocumentManager.MdiActiveDocument.TransactionManager.StartTransaction())
{
try
{
Database workingdatabase = HostApplicationServices.WorkingDatabase;
SymbolTable table = (SymbolTable)transaction.GetObject(workingdatabase.RegAppTableId,
Autodesk.AutoCAD.DatabaseServices.OpenMode.ForWrite, false);
if (!table.Has(app.Name))
{
table.Add(app);
transaction.AddNewlyCreatedDBObject(app, true);
}
if (!obj.IsWriteEnabled)
obj.UpgradeOpen();
obj.XData = new ResultBuffer(
new TypedValue((int)DxfCode.ExtendedDataRegAppName, app.Name),
new TypedValue((int)DxfCode.ExtendedDataInteger32, MyData));
transaction.Commit();
transaction.Dispose();
}
catch
{
return false;
}
}
return true;
}
#endregion