由RasterDataset得到RasterLayer

RasterDataset->RasterLayer

 IRasterLayer pRasterLayer = new RasterLayerClass(); 

            pRasterLayer.CreateFromDataset(pRasterDataset); 

            axMapControl1.Map.AddLayer(pRasterLayer as ILayer); ;

RasterLayer->RasterDataset

 IRasterLayer myrasterlayer = MapControl.Map.Layer[index] as IRasterLayer;

                IRaster myRaster = myrasterlayer.Raster;

                IRasterBandCollection myRasterBandCollection = myRaster as IRasterBandCollection;

                IRasterBand myRasterBand = myRasterBandCollection.Item();

                IRasterDataset myRasterDataset = myRasterBand as IRasterDataset;