直接贴代码了。

  string tMsg = String.Empty;
                ILayer6 cFeatureLayer = null;
                IFeatureGroups6 cFeatureLayerGroups = null;
                IFeatureGroup6 cFeatureGroupPoint = null;
                
                    SGWorld sg = new SGWorld();
                    string tShapeFileName = Application.StartupPath + @"\"+FilePath+@"\" + ExportFileShortName + ".shp";
                    string tConnectionString = String.Format("FileName={0};TEPlugName=OGR;", tShapeFileName);
                    
                    cFeatureLayer = sg.Creator.CreateFeatureLayer("路径"+DateTime.Now.ToString(), tConnectionString, groupid);
                    cFeatureLayer.Streaming = false;
                    sg.ProjectTree.SelectItem(cFeatureLayer.TreeItem.ItemID, 0, 0);
              
                
                    cFeatureLayerGroups = cFeatureLayer.FeatureGroups;
                    cFeatureGroupPoint = cFeatureLayerGroups.Polyline;
                    cFeatureGroupPoint.DisplayAs = ObjectTypeCode.OT_POLYLINE;
                    cFeatureLayer.Load();
                    cFeatureLayer.Refresh();
                    //sg.ProjectTree.SetVisibility(cFeatureLayer.TreeItem.ItemID, true);

                   
                    cFeatureGroupPoint.SetProperty("Line Color", Color.Blue.ToArgb());//红色
                    cFeatureGroupPoint.SetProperty("Line Width", 10);//线段宽度
                    cFeatureGroupPoint.SetProperty("Altitude Method", AltitudeTypeCode.ATC_TERRAIN_RELATIVE);
                    cFeatureGroupPoint.SetProperty("Altitude", 2.0);
                    cFeatureLayer.Refresh();