AutoCAD .net API中可以用如下代碼來設置entity的顏色為bylayer，請注意 BYLAYER的colorIndex為256。很簡單，光貼代碼。

 [CommandMethod("SetColorByLayer")]
public void SetColorByLayer()
{
ObjectId objId = GetSelectEntity();
using (Transaction trans = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction())
{
Entity ent = trans.GetObject(objId, OpenMode.ForWrite) as Entity;
//the corlor index of "BYLAYER" is 256, "BYBLOCK" is 0
ent.Color = Autodesk.AutoCAD.Colors.Color.FromColorIndex(Autodesk.AutoCAD.Colors.ColorMethod.ByLayer, 256);
trans.Commit();
}
}
private ObjectId GetSelectEntity()
{
ObjectId oid = ObjectId.Null;
using (DocumentLock docLoc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.LockDocument())
{
PromptEntityOptions selectionOp = new PromptEntityOptions("\nselect entity");
PromptEntityResult prRes = ed.GetEntity(selectionOp);
if (prRes.Status == PromptStatus.OK)
{
oid = prRes.ObjectId;
}
}
return oid;
}

.csharpcode, .csharpcode pre { font-size: small; color: rgba(0, 0, 0, 1); font-family: consolas, "Courier New", courier, monospace; background-color: rgba(255, 255, 255, 1) }
.csharpcode pre { margin: 0 }
.csharpcode .rem { color: rgba(0, 128, 0, 1) }
.csharpcode .kwrd { color: rgba(0, 0, 255, 1) }
.csharpcode .str { color: rgba(0, 96, 128, 1) }
.csharpcode .op { color: rgba(0, 0, 192, 1) }
.csharpcode .preproc { color: rgba(204, 102, 51, 1) }
.csharpcode .asp { background-color: rgba(255, 255, 0, 1) }
.csharpcode .html { color: rgba(128, 0, 0, 1) }
.csharpcode .attr { color: rgba(255, 0, 0, 1) }
.csharpcode .alt { background-color: rgba(244, 244, 244, 1); 100%; margin: 0 }
.csharpcode .lnum { color: rgba(96, 96, 96, 1) }

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