RevitAPI之如何載入族再創建族實例（以門爲例）

如何放置類型爲“0762 x 2032 mm”的門實例？

思路：

首先在文檔中找到名字爲“0762x2032 mm”的門類型，如果沒有找到，則加載一個名稱 爲“M_單-嵌板4.rfa”的族文件，這樣就得到一個Family；

然後從Family獲取名爲“0762x2032 mm”的門類型；

最後在文檔中獲取一個直線形的牆，計算牆的中點位置，在此位置插入類型爲“0762x 2032 mm”的門。

代碼如下：

 	public void CreatDoorInstance(Document RevitDoc, string doorTypeName = "0762 x 2032 mm")
        {
            FamilySymbol doorType = null;

            // 在文檔中找到名字爲"0762 x 2032 mm"的門類型 
            ElementFilter doorCategoryFilter = new ElementCategoryFilter(BuiltInCategory.OST_Doors);
            ElementFilter familySymbolFilter = new ElementClassFilter(typeof(FamilySymbol));
            LogicalAndFilter andFilter = new LogicalAndFilter(doorCategoryFilter, familySymbolFilter);
            FilteredElementCollector doorSymbols = new FilteredElementCollector(RevitDoc);
            doorSymbols = doorSymbols.WherePasses(andFilter);
            bool symbolFound = false;
            foreach (FamilySymbol element in doorSymbols)
            {
                if (element.Name == doorTypeName)
                {
                    symbolFound = true;
                    doorType = element;
                    break;
                }
            }

            // 如果沒有找到，就加載一個族文件 
            if (!symbolFound)
            {
                string file = @"C:\ProgramData\Autodesk\RVT  2014\Libraries\Chinese_INTL\門\M_單-嵌板 4.rfa";
                Family family;
                bool loadSuccess = RevitDoc.LoadFamily(file, out family);
                if (loadSuccess)
                {
                    foreach (ElementId doorTypeId in family.GetValidTypes())
                    {
                        doorType = RevitDoc.GetElement(doorTypeId) as FamilySymbol;
                        if (doorType != null)
                        {
                            if (doorType.Name == doorTypeName)
                            {
                                break;
                            }
                        }
                    }
                }
                else
                {
                    Autodesk.Revit.UI.TaskDialog.Show("Load family failed", "Could not load family file '" + file + "'");
                }
            }

            // 使用族類型創建門 
            if (doorType != null)
            {
                // 首先找到線形的牆 
                ElementFilter wallFilter = new ElementClassFilter(typeof(Wall));
                FilteredElementCollector filteredElements = new FilteredElementCollector(RevitDoc);
                filteredElements = filteredElements.WherePasses(wallFilter);
                Wall wall = null;
                Line line = null;
                foreach (Wall element in filteredElements)
                {
                    LocationCurve locationCurve = element.Location as LocationCurve;
                    if (locationCurve != null)
                    {
                        line = locationCurve.Curve as Line;
                        if (line != null)
                        {
                            wall = element;
                            break;
                        }
                    }
                }

                // 在牆的中心位置創建一個門 
                if (wall != null)
                {
                    XYZ midPoint = (line.GetEndPoint(0) + line.GetEndPoint(1)) / 2;
                    Level wallLevel = RevitDoc.GetElement(wall.LevelId) as Level;
                    //創建門：傳入標高參數，作爲門的默認標高 
                    FamilyInstance door = RevitDoc.Create.NewFamilyInstance(midPoint, doorType, wall,
              wallLevel, Autodesk.Revit.DB.Structure.StructuralType.NonStructural);
                    Autodesk.Revit.UI.TaskDialog.Show("Succeed", door.Id.ToString());
                    System.Diagnostics.Trace.WriteLine("Door created: " + door.Id.ToString());
                }
                else
                {
                    Autodesk.Revit.UI.TaskDialog.Show("元素不存在", "沒有找到符合條件的牆");
                }
            }
            else
            {
                Autodesk.Revit.UI.TaskDialog.Show("族類型不存在", "沒有找到族類型'" + doorTypeName + "'");
            }
        }

注意:這裏的門並不是插入到牆的中點位置，RevitAPI會自動調整門的Z軸的值，直至它和牆平齊。

另外，創建的時候，傳入的標高會作爲門的標高，如果不傳，則門就沒有標高。

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