private void button2_Click(object sender, EventArgs e)

        {

            axMapControl1.ClearLayers();

            if (tiffPath == "")

                return;

            int Index = tiffPath.LastIndexOf("\\");

            string fileName = tiffPath.Substring(Index+);

            string filePath = tiffPath.Substring(, Index);

            IWorkspaceFactory pWorkspaceFactory = new RasterWorkspaceFactoryClass();//利用工厂对象去生成一个raster文件的工作空间

            IRasterWorkspace pRasterWorkspace = (IRasterWorkspace)pWorkspaceFactory.OpenFromFile(filePath, );//到指定路径下

            IRasterDataset pRasterDataset = (IRasterDataset)pRasterWorkspace.OpenRasterDataset(fileName);//利用要素集去接收对应的raster文件

            IRasterLayer pRasterLayer = new RasterLayerClass();//生成一个矢量图层对象

            pRasterLayer.CreateFromDataset(pRasterDataset);//利用矢量图层对象去创建对应的raster文件

            axMapControl1.Map.AddLayer(pRasterLayer);//添加对应的图层

            axMapControl1.ActiveView.Refresh();

        }