ABD CONNECT 版本已经支持 .NET API。 开发时需要参考的dll文件是： $(ABD_INSTALL_DIR)\Assemblies\Bentley.Building.Api.dll 。主要的API接口都定义在 Bentley.Building.Api 这个名字空间中。

API接口所定义的类是C语言接口的封装。以FormRecipe为例， interface ITFFormRecipe 定义了mdlTFFormRecipe_xxx函数所提供的功能。

这里有一个简单的例子，包含在SDK 的example 中。examples\buildingelement\Test.cs

public sealed class Test
{
    public static void Run(string unparsed)
    {
        DPoint3d start = new DPoint3d(0,0,0);
        DPoint3d opposite = new DPoint3d(5000, 0, 0);

        //建立FormRecipe对象
        TFFormRecipeLinearList form = new TFFormRecipeLinearList();

        //初始化FormRecipe对象
        Bentley.DgnPlatformNET.DgnModelRef modelRef = Bentley.MstnPlatformNET.Session.Instance.GetActiveDgnModelRef();
        form.Init("");
        form.SetModelRef(modelRef, 0);
        
        //得到ITFFormRecipeLinear接口
        ITFFormRecipeLinear wallForm = form.AsTFFormRecipeLinear;
        
        //设置属性
        wallForm.SetEndPoints(ref start, ref opposite, 0);
        wallForm.SetThickness(200, 0);
        wallForm.SetTopFixedHeight(1000, 0);

        string DGType = "Wall";
        string DGItem = "Brick";
        string FamilyName = "WallComponent";
        string PartName = "Brick";

        ITFFormRecipe f = form.AsTFFormRecipe;
        f.SetPartName(PartName, 0);
        f.SetPartFamilyName(FamilyName, 0);

        //同步内存中的数据定义
        f.Synchronize(0);

        //生成Element
        Element elm;
        f.GetElement(0, out elm);

        //得到系统用的DataGroup对象
        TFCatalogList datagroup = new TFCatalogList();
        ITFCatalog catalog = datagroup.AsTFCatalog;

        //得到具体的CatalogItem定义
        ITFCatalogItemList itemList;
        catalog.GetCatalogItemByNames(DGType, DGItem, 0, out itemList);
        
        //得到CatalogItem接口
        ITFCatalogItem item = itemList.AsTFCatalogItem;
        
        //设置Family Part属性
        item.SetFamilyAndPartValueChar(FamilyName, PartName, 0);
        
        //在Element上增加DataGroup属性
        item.AttachLinkagesOnElement(ref elm, 0);
        
        //把element保存到文件中
        elm.AddToModel();
    }

}

上面这段代码，演示的是创建一段墙。还有另外的一种方式创建墙，具体的代码是：

public static Element CreateElement(DPoint3d start, DPoint3d opposite, int height, bool isDynamic = false)
{
    //得到系统DataGroup对象
    TFCatalogList datagroup = new TFCatalogList();
    datagroup.Init("");
    ITFCatalog catalog = datagroup as ITFCatalog;

    //得到CatalogItem定义
    ITFCatalogItemList itemList;
    catalog.GetCatalogItemByNames("Wall", "Brick", 0, out itemList);

    //创建LoadableWall对象。
    TFLoadableWallList form = new TFLoadableWallList();
    form.InitFromCatalogItem(itemList, 0);
    form.SetWallType(TFdLoadableWallType.TFdLoadableWallType_Line, 0);
    
    //设置属性
    start.ScaleInPlace(1.0 / 304800.0);
    opposite.ScaleInPlace(1.0 / 304800.0);
    form.SetEndPoints(ref start, ref opposite, 0);
    form.SetHeight(height, 0);
    form.SetThickness(height / 10.0, 0);

    //构造Element
    Element elm;
    if ( isDynamic )
        {
        Element baseLine;
        form.GetPreviewDescr(out baseLine, 0, out elm);

        // setting the modelref on the element is needed later for transient draw code to work
        var itfe = elm as Bentley.Building.Api.ITFElement;
        if ( itfe != null )
            itfe.SetModelRef(Bentley.MstnPlatformNET.Session.Instance.GetActiveDgnModelRef(), 0);
        }
    else
        {
        form.GetElementWritten(out elm, Bentley.MstnPlatformNET.Session.Instance.GetActiveDgnModelRef(), 0);
        }

    return elm;
}