I was getting an exception like this. The problem was that I renamed my .edmx file and forgot to change the name in EF Web.config file’s connection string: metadata=res://*/MyModel.csdl|res://*/MyModel.ssdl|res://*/MyModel.msl;
Updating an EDMX the safe way: As you have found, the update from database does not always change existing properties correctly. From our day-to-day use of EDMX updating (100s of updates over 24 months), I would recommend the following sequence for updating an EDMX. Delete existing model and then update: Open the EDMX designer Ctrl-A … Read more
Don’t pass db models directly to your views. You’re lucky enough to be using MVC, so encapsulate using view models. Create a view model class like this: public class EmployeeAddViewModel { public Employee employee { get; set; } public Dictionary<int, string> staffTypes { get; set; } // really? a 1-to-many for genders public Dictionary<int, string> … Read more
You’ll have to perform two database queries: var IDs = (from a in db1.Table1 join b in db1.Table2 on a.Id equals b.Id orderby a.Status where b.Id == 1 && a.Status == “new” select new a.Id).ToArray(); var query = from c in db2.Company join a in IDs on c.Id equals a.Id select new { Id = … Read more
I will take it little bit deeply because model defined functions are not very well known. Model defined functions must be manually added to CSDL part of EDMX file. You must open file as XML and add a function. For example this model defined function is able to produce full name of the employee: <Function … Read more