Tutorial :IQueryable IGrouping how to work


i return such type IQueryable< IGrouping<int, Invoice>> List() how can i work with it? like with generic List<Invoice> ?


No, you have a IGrouping<int, Invoice> as your list member.

Each grouping has a Key property allowing you access to the key of the group and an IEnumerable<Invoice> containing the grouped Invoices.

So to access it ...

IQueryable< IGrouping<int, Invoice>> List() groupedIvoices = //... get your grouping  foreach (var group in groupedIvoices ) {      var key = group.Key;      var invoicesInGroup = group.ToList();  }  

Look at 101 Linq Samples for samples and explanations for the different Linq functions.

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