Linq query to get results from DB in ASP.NET MVC 2

问题:

How do I query using Ling to Entities.

I want to get back the total number of rows for a specific user.

I created a table with an ID(PK), Username, and PhoneNumber.

In my controller, I am able to do this and see my entities:

public ActionResult UserInfo()
        {
            using (UserInfoEntities db = new UserInfoEntities())
            {

            }
            return View();
        }

How do I query to return the total number of rows and declare it to a variable (totalrows) so that I can do thge following:

ViewData["TotalRows"] = totalrows

If there is a better way I am open to suggestions...

Thanks!!

回答1:

Probably something like:

int count = db.SomeTable.Where(r => r.Username.Equals("username")).Count();

回答2:

Yep Matthew is right. The count method does exactly what you need! Although, I would recommend looking at ViewModels to pass your data to your view (rather than ViewData) and some kind of DAL pattern, such as the repository pattern, for querying your entities.