如果您尝试删除应用程序数据库中的数据并且出现此错误，该怎么办。 [英] What to do if you attempt to delete data in your application database and you get this error.

问题描述

当我尝试删除应用程序数据库中的数据时，我收到此错误，当我单击删除按钮时，它显示参数字典包含非可空类型'系统的参数'id'的空条目。 Int32'

I`m getting this error when i try to delete data in my application database, when i click on the delete button it says "The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32'"

//This is my delete method in business logic
       public void DeleteMovie(MovieView model)
        {
            using (var movierepo = new MovieRepository())
            {
                Movie mov = movierepo.GetById(model.MovieId);
                movierepo.Delete(mov);
            }
        }        


    //My delete method inside the controller

        public ActionResult DeleteF(MovieView model, int id)
        {
                var m = movieLogic.GetById(id);
                movieLogic.DeleteMovie(m);

            return RedirectToAction("Index", "Admin");
        }
 
        [HttpGet]
        public ViewResult Update(int movieId)
        {
            var movie = movieLogic.GetById(movieId);
            return View(movie);
        }

        [HttpPost]
        public ActionResult Update(MovieView movie, HttpPostedFileBase image = null)
        {
            if (ModelState.IsValid)
            {
                if (image != null)
                {
                    movie.MovieArt = image.ContentType;
                    movie.MovieArtData = new byte[image.ContentLength];
                    image.InputStream.Read(movie.MovieArtData, 0, image.ContentLength);
                }
                movieLogic.UpdateMovie(movie);
                TempData["message"] = string.Format("{0} has been saved", movie.Title);
                return RedirectToAction("Index");
            }
            else
            {
                // there is something wrong with the data values
                return View(movie);
            }
        }

    //This is part of my view

    @using (Html.BeginForm("DeleteF", "Admin"))
    {
        @Html.AntiForgeryToken()

        <div class="form-actions no-color">
            <input type="submit" value="Yes" class="btn btn-danger" />
            <span>
                @Html.ActionLink("No", "Index", null, new { @class = "btn btn-primary" })
            </span>
        </div>
    }

推荐答案

控制器在您的网址中需要 Id 参数但是你没有提供。

如：

Controller is expecting an Id parameter in your URL but you aren't supplying that.
Such as:

http://localhost:56230/controller/DeleteF/1
//Here "1"(ID) is missing

- 艾美

您好伙计，请尝试在您的视图中插入以下代码：



@using（Html.BeginForm（ DeleteF，Admin，new {id = model.movi​​eId}））;

Hi buddy, try inserting the following code in your view:

@using (Html.BeginForm("DeleteF", "Admin", new {id = model.movieId}));

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