I already explained how to make repositories simpler, by deriving from generic base. But the fact you need to create a repository for each entity in the data model still seemed like too much repetitive work. So I inspired by T4MVC and created a T4 file to generate repositories.
Basically what I do is get the project that the template file is in, search that project for all .edmx files, use Linq to XML to get entity type names and entity set names from conceptual models section, then iterate over entity sets in each file and generate the repositories.
Obviously this is specific to NecroNet Toolkit and will only work with unit of work and repository base form the toolkit. But you could make more complicated template file, to just generate repositories with all methods you need without the need of any third party libraries (no way I’m doing that though, so far I’m happy with the way unit of work + repositories in NecroNet Toolkit work).
One final note is that the template generates partial classes and partial interfaces, so you can extend it with you custom methods if you need.
You can download the code along with NecroNetToolkit from github - http://github.com/Necroskillz/NecroNetToolkit.
Exact link to the T4 template: http://github.com/Necroskillz/NecroNetToolkit/blob/master/T4Templates/Repositories.tt