Question

I have an application that uses Entity Framework to access the data, and throughout the code have linq statements like this:

var idsOrfaos = context.Items.Cast<OrdemAberta>()
                             .Select(p => p.OS)
                             .Except(IdsBd);

and SQL Statements too:

    var resumo = context.Database.SqlQuery<ViewModelSla>(
                    @"select * from table where blablabla", 
new object[] { new SqlParameter("parameteer", "parameteer) }
                           ).OrderBy(p => p.Ano).ThenBy(p => p.Mes);

It’s a WPF application.

My question is: how to move all the data access (for improve security and other reasons) to a WCF service to use over HTTP in a painless way? I have to rewrite all the access methods in the WCF application and call in WPF?

obs.: I has took a look in WCF Data Services OData but there are some functions that doesn’t work for me, and the service don’t need to be RESTful.

Answer 1

I would take a step by step approach.

Refactor all database calls into a client side service layer.

Rather than:

var idsOrfaos = context.Items.Cast<OrdemAberta>()
                         .Select(p => p.OS)
                         .Except(IdsBd);

You should have a call something like this:

var idsOrfaos = Application.ItemService.GetAllExcept(IdsBd);

Once all your database calls have been moved into a service layer, it will be easier to factor this out into a WCF service that can perform these queries for you.