IWorkspaceFactory wf = new RasterWorkspaceFactory();            IWorkspace ws = wf.OpenFromFile(path, 0);                        IRasterWorkspace rastWork = (IRasterWorkspace)ws;            IRasterDataset3 rds =(IRasterDataset3) rastWork.OpenRasterDataset(tmp+"2.img");            IRasterBandCollection rasterbands = (IRasterBandCollection)rds;                        IRaster raster = rds.CreateFullRaster(); RasterToText2(raster, path + "\\123.txt");        private void RasterToText2(IRaster raster, string txtFile)        {               var datas = RasterArray(raster);            StreamWriter sw = new StreamWriter(txtFile, false, Encoding.UTF8);            for (int i = 0; i < datas.GetLength(0); i++)            {                for (int j = 0; j < datas.GetLength(1); j++)                {                    sw.Write(datas.GetValue(i, j).ToString() + " ");                }                sw.WriteLine();            }            sw.Close();        }        public static System.Array RasterArray(IRaster raster)        {            IRasterProps props = (IRasterProps)raster;            //novalue = props.NoDataValue;            IPnt pBlockSize = new PntClass();            pBlockSize.SetCoords((double)props.Width, (double)props.Height);            IRaster2 raster2 = (IRaster2)raster;            IPixelBlock pixelBlock = raster2.CreateCursorEx(pBlockSize).PixelBlock;            pBlockSize.SetCoords(0.0, 0.0);            raster.Read(pBlockSize, pixelBlock);            IPixelBlock3 block2 = (IPixelBlock3)pixelBlock;            return (System.Array)block2.get_PixelData(0);        }