生成单波段栅格图像（C#+Engine9.2）

       IRasterDataset createFileRasterDataset(string directoryName, string fileName)

        {

            //The file must not be there. Otherwise, dataset can not be got.

            if (File.Exists(directoryName+fileName))

            {

                MessageBox.Show("File Exist!");

                IRasterLayer pRasterLayer = new RasterLayerClass();

                pRasterLayer.CreateFromFilePath(directoryName + fileName);

                ILayer pLayer;

                pLayer = pRasterLayer;

                pLayer.Name = "New Raster";

                axMapControl1.Map.AddLayer(pLayer);

                axMapControl1.ActiveView.Refresh();

                return null;

            }

            // This function creates a new img file in the given workspace 

            // and then assigns pixel values

            try

            {

                IRasterDataset rasterDataset = null;

                IPoint originPoint = new PointClass();

                originPoint.PutCoords(0, 0);

                // Create the dataset  

                IRasterWorkspace2 rasterWorkspace2 = null;

               // IGeographicCoordinateSystem m_GeographicCoordinateSystem;

                IProjectedCoordinateSystem m_ProjectedCoordinateSystem;

                ISpatialReferenceFactory2 spatRefFact = new SpatialReferenceEnvironmentClass();

                m_ProjectedCoordinateSystem = spatRefFact.CreateProjectedCoordinateSystem((int)esriSRProjCSType.esriSRProjCS_WGS1984UTM_49N);

                rasterWorkspace2 = createRasterWorkspace(directoryName);

                rasterDataset = rasterWorkspace2.CreateRasterDataset(fileName, "IMAGINE Image", originPoint, 200, 100, 1, 1, 1, rstPixelType.PT_UCHAR, m_ProjectedCoordinateSystem, true);//rstPixelType.PT_UCHAR,new UnknownCoordinateSystemClass()

                IRawPixels rawPixels = null;

                IPixelBlock3 pixelBlock3 = null;

                IPnt pixelBlockOrigin = null;

                IPnt pixelBlockSize = null;

                IRasterBandCollection rasterBandCollection;

                IRasterProps rasterProps;

                // QI for IRawPixels and IRasterProps   

                rasterBandCollection = (IRasterBandCollection)rasterDataset;

                rawPixels = (IRawPixels)rasterBandCollection.Item(0);

                rasterProps = (IRasterProps)rawPixels;

                // Create pixelblock   

                pixelBlockOrigin = new DblPntClass();

                pixelBlockOrigin.SetCoords(0, 0);

                pixelBlockSize = new DblPntClass();

                pixelBlockSize.SetCoords(rasterProps.Width, rasterProps.Height);

                pixelBlock3 = (IPixelBlock3)rawPixels.CreatePixelBlock(pixelBlockSize);

                // Read pixelblock   

                rawPixels.Read(pixelBlockOrigin, (IPixelBlock)pixelBlock3);

                // Get pixeldata array    

                System.Array pixelData;

                pixelData = (System.Array)pixelBlock3.get_PixelDataByRef(0);

                // Loop through all the pixels and assign value     

                for (int i = 0; i < rasterProps.Width; i++)

                    for (int j = 0; j < rasterProps.Height; j++)

                        pixelData.SetValue(Convert.ToByte((i * j) % 255), i, j);

                pixelBlock3.set_PixelData(0, (System.Object)pixelData);

                // Write the pixeldata back    

                System.Object cachePointer;  

                cachePointer = rawPixels.AcquireCache();

                rawPixels.Write(pixelBlockOrigin, (IPixelBlock)pixelBlock3);

                rawPixels.ReturnCache(cachePointer);  

                IRasterLayer pRasterLayer = new RasterLayerClass();

                pRasterLayer.CreateFromDataset(rasterDataset);

                ILayer pLayer;

                pLayer = pRasterLayer;

                pLayer.Name = "New Raster";

                axMapControl1.Map.AddLayer(pLayer);

                axMapControl1.ActiveView.Refresh();

                return rasterDataset;

               // userDataset= rasterDataset;

            }

            catch (Exception ex)

            {

                System.Diagnostics.Debug.WriteLine(ex.Message);

                return null;

            }

        }

        public IRasterWorkspace2 createRasterWorkspace(string pathName)

        {

            // Create RasterWorkspace 

            IWorkspaceFactory workspaceFactory = new RasterWorkspaceFactoryClass();

            return workspaceFactory.OpenFromFile(pathName, 0) as IRasterWorkspace2;

        }