2015-04-26-multi-tenancy-with-asp-net-and-entity-framework_001.cs

public class UserFilter: ActionFilterAttribute 
{
 ///
 /// Set session data for current user:
 /// - Current user
 /// - Tenant of the current user
 ///
 ///
 public override void OnActionExecuting(ActionExecutingContext filterContext) {
  // User must be logged in before setting session data
  if (filterContext.HttpContext.User.Identity.IsAuthenticated) 
  {
   // Ensure session data compares to the actual current user
   if (filterContext.HttpContext.Session["User"] as string != filterContext.HttpContext.User.Identity.Name) 
   {
    filterContext.HttpContext.Session["User"] = filterContext.HttpContext.User.Identity.Name;
    filterContext.HttpContext.Session["Tenant"] = null;
   }

   // Set tenancy identity for the current user
   if (filterContext.HttpContext.Session["Tenant"] == null) 
   {
    string directoryPath = filterContext.HttpContext.Server.MapPath("~/bin");
    using(ServiceFactory factory = new ServiceFactory(directoryPath)) 
    {
     string[, ] nullconstructor = new string[, ] {
      {
       "Tenant",
       null
      }
     };

     using(IRepository tenantRepository = factory.Create(nullconstructor)) 
     {
      // Get current user from database and check to which tenant it belongs
      m.Tenant currentTenant = tenantRepository.FindOne(x = & gt; x.AspNetUsers.Select(y = & gt; y.Email).Contains(filterContext.HttpContext.User.Identity.Name));
      string tenantCode = currentTenant != null ? currentTenant.Code : string.Empty;

      filterContext.HttpContext.Session["Tenant"] = tenantCode;
     }
    }
   }
  }
 }
}