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);