經過特定的迭代次數後，AutoCAD COM應用程序變慢了

Question

我正在使用AutoCAD COM庫來移動塊以避免重疊。我現在正在做的方式是將選擇設置爲一圈，試圖找到一個開放空間，如果沒有找到，它將擴展該圈。

問題是，在此循環的387-388步之後，它顯着減慢。我添加了一個秒錶來查看減速的出現位置，但如果我刪除了某些東西，則確切的位置會發生變化。我實際上刪除了一切，我認爲可能會放緩它，這也沒有幫助。所以，在這一點上，我真的不知道爲什麼減速是一致發生。

這裏是我認爲是造成經濟放緩的代碼，讓我知道如果你需要更多的信息：

// Selection set 
Int16[] filterCode = new Int16[] { 8 }; 
object[] filterValue = new object[] { LAYERNAME }; 
selectionSet.Select(AcSelect.acSelectionSetAll, Type.Missing, Type.Missing, filterCode, filterValue) 

// This is how I grab the blocks 
listOfEntities = new List<AcadEntity>(); 
foreach(AcadEntity entity in selectionSet) 
{ 
    if(entity.ObjectName.Equals("AcDbBlockReference")) 
    { 
     AcadBlockReference block = entity as AcadBlockReference; 
     if(block.Name.Equals(BLOCKNAME)) 
      listOfEntities.Add(entity); 
    } 
    else if(entity.ObjectName.Equals("AcDbText")) 
    { 
     listOfEntities.add(entity); 
    } 
} 

然後我用一個foreach遍歷實體列表中移動，並調用我的函數找到空的空間。

if(listOfEntities.Count > 0) 
{ 
    _thisDrawing.SendCommand("zoom extent "); 

    foreach(AcadEntity entity in listOfEntities) 
    { 
     FindEmptySpace(entity); 
    } 
} 

這是我如何移動塊找到空的空間。

radius = (blockHeight > blockWidth ? blockHeight: blockWidth)/10; 

for(double distance = radius; ; distance += radius) 
{ 
    angle = PIx2/distance; 

    for (double currentAngle = angle; currentAngle < PIx2; currentAngle += angle) 
    { 
     try 
     { 
      AcadSelectionSet spaceSelection; 
      // This ends up being 387-388 every time the slow down starts. 
      _totalSteps++; 

      // The new location of the block 
      newCenterLocation[0] = ((Math.Cos(currentAngle) * distance) + centerLocatoin[0]); 
      newCenterLocation[1] = ((Math.Sin(currentAngle) * distance) + centerLocation[1]); 

      // The new bounding box points 
      newMaxExt[0] = newCenterLocation[0] + (blockWidth/2); 
      newMaxExt[1] = newCenterLocation[1] + (blockHeight/2); 
      newMinExt[0] = newMaxExt[0] - blockWidth; 
      newMinExt[1] = newMinExt[1] - blockHeight; 

      // Make sure the "SpaceSet" isn't already created. 
      // I'm not sure if there is an easier way to do this. 
      try 
      { 
       _thisDrawing.SelectionSets.Item("SpaceSet").Delete(); 
      } 
      catch 
      {} 

      spaceSelection = _thisDrawing.SelectionSets.Add("SpaceSet"); 

      block.Move(centerLocation, newCenterLocation); 

      spaceSelection.Select(AcSelect.acSelectionSetCrossing, newMinExt, newMaxExt, Type.Missing, Type.Missing); 

      // This is '== 1' because I'm moving the block as well as the selectionset 
      if(spaceSelection.Count == 1) 
      { 
       spaceSelection.Clear(); 
       // Found empty space 
       return; 
      } 

      spaceSelection.Clear(); 
      // Empty space wasn't found at this location, move block back. 
      // I need to to this because it seems that the Move function moves 
      // the blocks based on the difference between the two locations. 
      block.Move(newCenterLoaction, centerLocation); 
     } 
    } 
} 

我不確定如果我忘記做任何事情。任何幫助，將不勝感激。

另外，我已經嘗試過使用COM的2002和2013版本，不確定是否有區別。

UPDATE：在處理我發佈的版本問題時，我得到的應用程序在2002年工作。它在AutoCAD 2002上運行時不會變慢。它是完全相同的代碼，唯一的區別是我使用的庫和版本號（AutoCAD.Application.15 vs AutoCAD.Application.19）。所以，就是這樣。

Answer 1

一個提示，而不是使用SendCommand，用這個變焦範圍（從AutoCAD .NET開發人員的幫助）：

// Zoom to the extents of the current space 
Zoom(new Point3d(), new Point3d(), new Point3d(), 1.01075);