GP学习（七）—Accessing raster workspaces

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Accessing raster workspaces

Summary
Rasters can reside in a folder, a personal geodatabase, a file geodatabase, or an ArcSDE geodatabase. This topic shows how to access different types of workspaces as raster workspaces. 

About accessing raster workspaces

All geodatabase workspaces support the IRasterWorkspaceEx interface, while file workspaces support IRasterWorkspace. To access raster workspaces, see the following code example:
[C#]

//Open a file geodatabase workspace as RasterWorkspace.
static IRasterWorkspaceEx OpenFGDB(string FGDBPath)
{
//FGDBPath string example: c:\data\raster.gdb.
IWorkspaceFactory2 workspaceFactory = new FileGDBWorkspaceFactoryClass();
return (IRasterWorkspaceEx)workspaceFactory.OpenFromFile(FGDBPath, 0);
}

//Open an ArcSDE workspace as RasterWorkspace.
static IRasterWorkspaceEx OpenSDE(string conString)
{
//conString example: SERVER=ais;INSTANCE=9200;VERSION=sde.DEFAULT;USER=raster;PASSWORD=raster.
IWorkspaceFactory2 workspaceFactory = new SdeWorkspaceFactoryClass();
return (IRasterWorkspaceEx)workspaceFactory.OpenFromString(conString, 0);
}

//Open an accessed workspace as RasterWorkspace.
static IRasterWorkspaceEx OpenAccess(string PGDBPath)
{
//FGDBPath string example: c:\data\rasters.mdb.
IWorkspaceFactory2 workspaceFactory = new AccessWorkspaceFactoryClass();
return (IRasterWorkspaceEx)workspaceFactory.OpenFromFile(PGDBPath, 0);
}

//Open a file workspace as RasterWorkspace.
static IRasterWorkspace OpenFileWorkspace(string wsPath)
{
//wsPath example: c:\data\rasters.
IWorkspaceFactory workspaceFact = new RasterWorkspaceFactoryClass();
return (IRasterWorkspace)workspaceFact.OpenFromFile(wsPath, 0);
}