ArcEngine如何将IRaster对象添加到mapcontrol中

////添加栅格数据

            OpenFileDialog pOpenFileDialog = new OpenFileDialog();

            pOpenFileDialog.CheckFileExists = true;

            pOpenFileDialog.Title = "打开Raster文件";

            pOpenFileDialog.Filter = "栅格文件(*.*)|*.bmp;*.tif;*.jpg;*.img|(*.bmp)|*.bmp|(*.tif)|*.tif|(*.jpg)|*.jpg|(*.img)|*.img";

            pOpenFileDialog.ShowDialog();

            string pRasterFileName = pOpenFileDialog.FileName;

            if (pRasterFileName == "") return;

            string pPath = System.IO.Path.GetDirectoryName(pRasterFileName);//定义文件路径

            string pFileName = System.IO.Path.GetFileName(pRasterFileName);//定义文件名，获取路径中选择的文件名

            IWorkspaceFactory pWorkspaceFactory = new RasterWorkspaceFactory();//实例化工作空间工厂接口对象，用于实例工作空间对象

            IWorkspace pWorkspace = pWorkspaceFactory.OpenFromFile(pPath ,0);//获取栅格文件的工作区

            IRasterWorkspace pRasterWorkspace = pWorkspace as IRasterWorkspace;//实例栅格空间对象

            IRasterDataset pRasterDataset = pRasterWorkspace.OpenRasterDataset(pFileName );//获取栅格文件的数据集，实例化栅格文件对象

            //影像金字塔的判断与创建

            IRasterPyramid3 pRasPyrmid;//定义金字塔对象

            pRasPyrmid = pRasterDataset as IRasterPyramid3;

            if (pRasPyrmid != null)

            {

                if (!(pRasPyrmid.Present))///判断是否具有金字塔

                {

                    pRasPyrmid.Create();//创建金字塔

                }

            }

            IRaster pRaster;

            pRaster = pRasterDataset.CreateDefaultRaster();

            IRasterLayer pRasterLayer;//定义栅格图层

            pRasterLayer = new RasterLayer();//实例化栅格图层类

            pRasterLayer.CreateFromRaster(pRaster);//创建获取栅格数据集

            ILayer pLayer = pRasterLayer as ILayer;//实例化图层对象继承于栅格图层

            mainMapControl.AddLayer(pLayer ,0);

        }