Question

I have three level hierarchical data. using the statement below i managed to display two
level data. I need to extend it to one more level.

Current hierachy is Modules–>Documents

I need to extend it as Packages–>Modules–>Documents

var data = (from m in DataContext.SysModules
             join d in DataContext.SysDocuments on m.ModuleID equals d.ModuleID into tempDocs
             from SysDocument in tempDocs.DefaultIfEmpty()
             group SysDocument by m).ToList();

Regards
Tassadaque

Answer 1

You should use the DataLoadOptions property on DataContext.

DataLoadOptions dlo = new DataLoadOptions();
  //packages are loaded with their modules...
dlo.LoadWith<SysPackage>(p => p.SysModules);
  // ... which are loaded with their documents.
dlo.LoadWith<SysModule>(m => m.SysDocuments);
myDataContext.LoadOptions = dlo;
List<SysPackage> result = myDataContext.SysPackages.ToList();