Question

我对编程完全陌生，所以我的问题可能令人困惑，但我会尽力解释。

所以我构建了一个应用程序，其评级在1-5之间。结果存储在数据库中。但我不明白如何在我的模型类中放置一些逻辑，它可以检索该数字并输出用户输入的数字和给出的评级的总体平均值。

这是我的Model类：

 public class MovieReview : IValidatableObject
{
    public int Id { get; set; }


    [Range(1,10)]
    [Required]
    public double Rating { get; set; }

    [Required]
    [StringLength(1024)]
    public string Comment { get; set; }


    [Display(Name="User Name")]
    [DisplayFormat(NullDisplayText="anonymous")]


    //[MaxWord(5)]
    public string ReviewerName { get; set; }
    public int MovieId { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if(Rating < 2 && ReviewerName.ToLower().StartsWith("keith"))
        {
            yield return new ValidationResult("Scorry, Keith uou can't do this");
        }
        //throw new NotImplementedException();
    }
}

public partial class MovieReview : IValidatableObject
{
    public ICollection<AverageRating>

    public int Id { get; set; }
    public int AverageRating { get _AverageRating(c => c.AverageRating; set; }

}

}

这是我的控制者：

namespace YayOrNay.Controllers

{ 公共类评论控制器：控制器 { YayOrNayDb _db = new YayOrNayDb（）;

    // GET: Reviews
    public ActionResult Index([Bind(Prefix = "id")]int movieId)
    {
        var movie = _db.Movies.Find(movieId);
        if(movie !=null)
        {
            return View(movie);
        }
        return HttpNotFound();

    }

    [HttpGet]
    public ActionResult Create (int movieId)
    {
        return View();
    }

    [HttpPost]
    public ActionResult Create(MovieReview review)
    {
       if(ModelState.IsValid)
       {
           _db.Reviews.Add(review);
           _db.SaveChanges();
           return RedirectToAction("Index", new { id = review.MovieId });
       }
       return View(review);
    }

    [HttpGet]
    public ActionResult Edit (int id)
    {
        var model = _db.Reviews.Find(id);
        return View(model);
    }

    //[Bind(Exclude = "ReviewerName")]
    [HttpPost]
    public ActionResult Edit (MovieReview review)
    {
        if (ModelState.IsValid)
        {
            _db.Entry(review).State = EntityState.Modified;
            _db.SaveChanges();
            return RedirectToAction("Index", new { id = review.MovieId });
        }
        return View(review);
    }



    protected override void Dispose(bool disposing)
    {
        _db.Dispose();
        base.Dispose(disposing);
    }   

}

}

这是我的观点：

@model IEnumerable<YayOrNay.Models.MovieReview>




<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.Rating)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Comment)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.ReviewerName)
        </th>






        <th></th>
    </tr>

    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Rating)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Comment)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.ReviewerName)
            </td>





            <td>
                @Html.ActionLink("Edit", "Edit", new { id = item.Id }) |

            </td>
        </tr>
    }

</table>

我希望这足以让您了解我想要做的事情。

获取用户输入到数据库的平均值？

0 个答案: