C#+AE 用MapControl加载栅格格式文件

需要引入DataSourceRaster命名空间。

具体步骤如下:

①:利用工作控件工厂抽象类定义接口变量,利用工作空间工厂的子类RatserWorkspaceFactory对应的组件类RasterWorkspaceFactoryClass实例化该接口变量。

②:定义并实例化工作空间变量,定义并实例化栅格工作空间变量;

③:定义栅格数据集,并利用所选栅格数据文件进行实例化,判断该文件是否具有金字塔,若没有,则创建金字塔,以提高大数据量图像的显示效率;

④:定义栅格数据,栅格数据层和数据层,并向MapControl控件中添加数据层数据。

具体代码如下:

System.Windows.Forms.OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "*.bmp|*.bmp|*.jpg|*.jpg|*.tif|*.tif";
            ofd.ShowDialog();


           

string filePath = ofd.FileName;

//此两个路径和文件名作为参数:

  string pathName = System.IO.Path.GetDirectoryName(filePath);
            string fileName = System.IO.Path.GetFileName(filePath);

 

//定义工作空间工厂并实例化:

            IWorkspaceFactory pWSF;
            pWSF = new RasterWorkspaceFactoryClass();

//

            IWorkspace pWS;
            pWS = pWSF.OpenFromFile(pathName,0);

            IRasterWorkspace pRWS;
            pRWS = pWS as IRasterWorkspace;


            IRasterDataset pRasterDataset;
            pRasterDataset = pRWS.OpenRasterDataset(fileName);

            //影像金字塔的判断与创建
            IRasterPyramid pRasPyrmid;
            pRasPyrmid = pRasterDataset as IRasterPyramid;

            if(pRasPyrmid!=null)
            {
                if(!(pRasPyrmid.Present))
                {
                    pRasPyrmid.Create();
                }
            }

            IRaster pRaster;
            pRaster = pRasterDataset.CreateDefaultRaster();

            IRasterLayer pRasterLayer;
            pRasterLayer = new RasterLayerClass();
            pRasterLayer.CreateFromRaster(pRaster);

            ILayer pLayer = pRasterLayer as ILayer;
            axMapControl1.AddLayer(pLayer,0);

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