Stored procedure

//Create adapter data access, where OrderContext your DbContext
var dataAdapter = new OeEfCoreDataAdapter<Model.OrderContext>();
//Create query parser
var parser = new OeParser(new Uri("http://dummy"), dataAdapter.BuildEdmModel());
//The result of the stored procedure
var response = new MemoryStream();
//Execute sored procedure
await parser.ExecuteGetAsync(new Uri("http://dummy/dbo.GetOrders(name='Order 1',id=1,status=null)"), OeRequestHeaders.JsonDefault, response, CancellationToken.None);

If procedure name different from method name use attrubute Description("dbo.GetOrders") on method data context.