Question

I’m new to using Linq and just started a side project to learn some of the basics. I’m currently using Linq to Sql and all my DB Table relationships worked very well. Currently I have a Client table and a Project table. Each Client can have 1 or more Projects. Therefore, as you’d expect each Client object has a collection of Project objects after Linq does its magic.

I’m using the below code and it works well, but I think there is a better way of doing it. I need to pass my method a ProjectID and then select that Project from the Client:

    private void PopulateStatusView(int projectID)     {         MyDataContext db = new MyDataContext();          var client = (from u in db.Clients                       where u.id == Convert.ToInt32(Session['ClientID'])                       select u).SingleOrDefault();          if (client != null)         {             foreach (Project currentProject in client.Projects)             {                 if (currentProject.id == projectID)                 {                     // Project Selected Here                     statusProjectName.Text = currentProject.name;                 }             }         }         else         {              // Session Expired         }     } 

Can anyone let me know if there’s a better solution rather than looping over each Project.

Thank you.

Answer 1

To get the client which has the specific project ID:

var client = (from u in db.Clients               where u.id == Convert.ToInt32(Session['ClientID']) &&                      u.Projects.Any(x=>x.id == projectID)               select u).SingleOrDefault(); 

To get the project:

var project = (from u in db.Clients               where u.id == Convert.ToInt32(Session['ClientID']) &&                      u.Projects.Any(x=>x.id == projectID)               select u.Projects.Where(x=>x.id == projectID).Single()).SingleOrDefault();