Question

我的控制器：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(BlogCompModel blogmodel)
{
   if (ModelState.IsValid)
   {
      ...
   }
}

我的观点：

@model BlogProject.Models.BlogCompModel

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()

    ...


   <div class="form-group">
      @Html.LabelFor(model => model.BlogCompModel.posts, "Property", new { @class = "control-label col-md-2" })
      <div class="col-md-10">
        @Html.ListBoxFor(model => model.posts, new MultiSelectList(Model.posts, "post_ID", "postTitle"))
        @Html.ValidationMessageFor(model => model.posts.posts)
      </div>
   </div>

}

帖子上的错误消息：

"The parameter conversion from type 'System.String' to type 'BlogProject.Models.Posts' failed because no type converter can convert between these types."}  System.Exception {System.InvalidOperationException}

正如您所看到的，我不确定如何将HTML Multiselect列表从Post_ID集合转换为ICollection的帖子。

谢谢！

Answer 1

您可以在BlogCompModel模型中添加其他属性，它会将所有选定的帖子包装在其中。

public class BlogCompModel
{
    // 
    public string[] selectedPosts { get; set; }
}

然后在你看来：

@Html.ListBoxFor(model => model.selectedPosts , 
                 new MultiSelectList(Model.posts, "post_ID", "postTitle"))
@Html.ValidationMessageFor(model => model.selectedPosts )

Answer 2

在我的博客MVC应用程序中，我有一个用于标签的多选项，以及我如何将这些添加到Post in Create操作中。

<强> Index.cshtml

@model MyBlog.Core.Post

 @Html.ListBox("PostTags", (MultiSelectList)ViewBag.MultiSelectList, new { @class = "form-control" })

控制器

public ActionResult CreatePost([Bind(Include = "Id,Title,ShortDescription,Description,Published,PostedOn,ModifiedOn,CategoryId")] Post post, int[] postTags)
        {
            if (postTags != null)
            {
                foreach (var t in postTags)
                {
                    var tag = _dbTag.GetById(t);
                    post.Tags.Add(tag);
                }
            }
           // save to database and other stuff
           return View(post);
        }

ASP MVC EF MultiSelect HTTP POST

2 个答案: