start

[Transaction(TransactionMode.Manual)]

[Regeneration(RegenerationOption.Manual)]

public 

class cmd : IExternalCommand

{

    

public Result Execute(ExternalCommandData cmdData, 

ref 

string msg, ElementSet elements)

    {

        UIDocument uiDoc = cmdData.Application.ActiveUIDocument;

        Document doc = uiDoc.Document;

        Selection selection = uiDoc.Selection;

        Transaction ts = 

new Transaction(doc, 

this.ToString());

        ts.Start();

        

//

        Reference refWall = selection.PickObject(ObjectType.Element, 

"

选择墙：

");

        Wall wall = doc.GetElement(refWall) 

as Wall;

        WallType wallType = wall.WallType;

        CompoundStructure cs = wallType.GetCompoundStructure();

        

bool bHas = 

false;

//

是否拥有保温层

        

int iWidth = 

100;

//

要设置的保温层厚度

        IList<CompoundStructureLayer> layers = cs.GetLayers();

//

找到所有层

        

foreach (CompoundStructureLayer layer 

in layers)

        {

            

if (layer.Function == MaterialFunctionAssignment.Insulation)

//

判断保温层

            {

                bHas = 

true;

                layer.Width = iWidth / 

304.8;

            }

        }

        

if (!bHas)

//

没有保温层则创建

        {

            CompoundStructureLayer newLayer = 

new CompoundStructureLayer();

            newLayer.Function = MaterialFunctionAssignment.Insulation;

            newLayer.Width = iWidth / 

304.8;

            

//

layers.Add(newLayer);

            layers.Insert(

0, newLayer);

        }

        cs.SetLayers(layers);

        wallType.SetCompoundStructure(cs);

        

//

        ts.Commit();

        

return Result.Succeeded;

    }

}

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