Question

项目，我得到一个错误问题;

“参数字典包含非可空类型'System.Int32'的参数'Id'的空条目，用于'BlogNewCMS.Controllers.HomeController'中的方法'Void Delete（Int32）'。可选参数必须是引用类型，可空类型，或声明为可选参数。 Parametreadı：参数“

控制器;

    [HttpPost]
    public void Delete(int Id)  
    {

        using (var session = FluentNHibernateConnectingAdmin.OpenSession())
        {

            using (var transaction = session.BeginTransaction())
            {
                var article = session.QueryOver<Article>().Where(x => x.Id == 3).SingleOrDefault();

                session.Delete(article);

                transaction.Commit();
            }
        }
    }

页;

                        @foreach (var active in Model)
                    {


                        using (Html.BeginForm("Delete", "home", FormMethod.Post))
                        {

                            <tr role="row" class="gradeA odd">
                                <td class="sorting_1">@active.UserID</td>
                                <td>@active.Topic</td>
                                <td>@active.TopicDetail</td>
                                <td class="text-center">
                                    <input type="submit" class="btn btn-danger" name="name" value="Sil" />

                                </td>
                            </tr>

                    }
                        }

路由;

            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");


        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );

Answer 1

您的Delete方法需要Id参数int类型。但是你的表格没有，因此当你提交表格时没有通过。

在表单中添加一个输入字段，其中name属性值设置为"Id"

using (Html.BeginForm("Delete", "home", FormMethod.Post))
{
     <tr role="row" class="gradeA odd">
          <td class="sorting_1">@active.UserID</td>
          <td>@active.Topic</td>
          <td>@active.TopicDetail</td>
          <td class="text-center">
               <input type="submit" class="btn btn-danger" name="name" value="Sil" /> 
               <input type="hidden" name="Id" value="@active.Id" />
          </td>
    </tr>
}

此外，您可能希望在delete方法中添加返回类型，以便它返回响应。

public ActionResult Delete(int id)
{
  // to do : Delete
  return RedirectToAction("DeletedSuccessfully");
   // Assuming you have an action method called DeletedSuccessfully exist 
   // which shows the "Success message to user
}

Fluent Nhibernate参数字典包含参数的空条目

1 个答案: