Linq to Entity | Pass table join to model
Good time of a day!
I have a MVC project with query in controller:
var getPhotos = (from m in db.photos
join n in db.comments on m.id equals n.photoid
where n.ownerName == User.Identity.Name
orderby n.id descending
select new {
m.imgcrop, m.id,
n.commenterName, n.comment
}).Take(10);
How to pass this query to view model, and the model to view.
Spend all evening to find the examples, but cant. Thanks for help!
开发者_JAVA技巧UPDATED Full Model Class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace photostorage.Models
{
public class GlobalModel
{
public class PhotoViewModel
{
public photos Photos { get; set; }
public profiles Profile { get; set; }
public IQueryable<comments> Comments { get; set; }
public IQueryable<photos> NextPrev { get; set; }
}
public class UserPhotoList
{
public IQueryable<photos> Photos { get; set; }
public profiles Profile { get; set; }
}
public class UserProfileView
{
public IQueryable<photos> Photos { get; set; }
public profiles Profile { get; set; }
}
public class GetLastComments
{
public IQueryable<photos> uPhoto { get; set; }
public IQueryable<comments> uComments { get; set; }
}
}
}
Controller:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using photostorage.Models;
namespace photostorage.Controllers
{
public class HomeController : Controller
{
private photostorageEntities db = new photostorageEntities();
public ActionResult Index()
{
if(Request.IsAuthenticated) {
GlobalModel.GetLastComments model = new GlobalModel.GetLastComments();
var getPhotos = (from m in db.photos
join n in db.comments on m.id equals n.photoid
where n.ownerName == User.Identity.Name
select new {
m.imgcrop, m.id,
n.commenterName, n.comment
}).Take(10);
return View("Index_Auth", model);
}else{
ViewBag.Message = "Welcome to ASP.NET MVC!";
return View("Index");
}
}
public ActionResult About()
{
return View();
}
}
}
In this case you can make a "view model" that will only be used by your view and not by the rest of your application. Something like the following:
public class CommentsViewModel
{
public int MessageId { get; set; }
public string ImageCrop { get; set; }
public string CommenterName { get; set; }
public string Comment { get; set; }
}
Then change your query like so:
var getPhotos = (from m in db.photos
join n in db.comments on m.id equals n.photoid
where n.ownerName == User.Identity.Name
orderby n.id descending
select new CommentsViewModel {
ImageCrop = m.imgcrop,
MessageId = m.id,
CommenterName = n.commenterName,
Comment = n.comment
}).Take(10).ToList();
Make your view strongly typed to the new class and pass the data to it like so:
View("name_of_your_view", getPhotos);
If you wanted to do this, like you had:
var getPhotos = (from m in db.photos
join n in db.comments on m.id equals n.photoid
where n.ownerName == User.Identity.Name
select new {
m.imgcrop, m.id,
n.commenterName, n.comment
}).Take(10);
You could actually have this without creating a new "CommentsViewModel", but just use what should be the existing tables and models:
var getPhotos = (from m in db.Photos
join n in db.Comments on m.Id equals n.PhotoId
where n.OwnerName == User.Identity.Name
select new {
ImageCrop = m.ImageCrop,
Id = m.Id,
CommenterName = n.CommenterName,
Comment = n.Comment
}).Take(10);
The models would be something like these examples, if you had a foreign key relationship on the Photo.Id to Comments.PhotoId:
public class Photos
{
public int Id { get; set; }
public string ImageCrop { get; set; }
[ForeignKey("PhotoId")]
public virtual Comments Comment { get; set; }
}
public class Comments
{
public int Id { get; set; }
public int PhotoId { get; set; }
public string CommenterName { get; set; }
public string OwnerName { get; set; }
public string Comment { get; set; }
}
Just a note: The models you displayed in your question had none of these columns, yet you were building a query against them. It's best to remember to give a complete picture when asking for help.
精彩评论