Question

我有一个关于在ASP.net MVC中使用下拉列表的问题。

这是我的情况：

创建视图：

@using (Html.BeginForm("Create", "Deliverable", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>EventViewModel</legend>

        <div class="editor-label">
            @Html.LabelFor(model => model.Title)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Title)
            @Html.ValidationMessageFor(model => model.Title)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Description)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Description)
            @Html.ValidationMessageFor(model => model.Description)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Thumbnail)
        </div>
        <div class="editor-field">
            @Html.TextBoxFor(model => model.Thumbnail, new { type = "file" })
            @Html.ValidationMessageFor(model => model.Thumbnail)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Image)
        </div>
        <div class="editor-field">
            @Html.TextBoxFor(model => model.Image , new {type="file"})
            @Html.ValidationMessageFor(model => model.Image)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.VideoUrl)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.VideoUrl)
            @Html.ValidationMessageFor(model => model.VideoUrl)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.VideoUrl)
        </div>
        <div class="editor-field">

            @Html.ValidationMessageFor(model => model.VideoUrl)
        </div>

        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
}

在'VideoURL'之后，我想要一个包含存储在我的数据库中的值的下拉列表。我找到的大多数教程都没有将下拉列表中的值绑定到数据库。

我在我的后台插入我的数据库中的值，所以我不能将它们插入前台......

这是我的控制器：

 public ActionResult Create(DeliverableViewModel model)
    {
        var afstudeerrichtingen = (repository.GetAfstudeerrichtingen()).ToList();
        if (ModelState.IsValid)
        {
            try
            {
                MemoryStream target = new MemoryStream();
                model.Image.InputStream.CopyTo(target);
                byte[] data = target.ToArray();

                model.Thumbnail.InputStream.CopyTo(target);
                byte[] datatwo = target.ToArray();

                users usr = userrepo.FindByUsername(User.Identity.Name);
                model.UsernameID = usr.user_id;

                repository.AddDeliverable(model.Title, model.Description, model.UsernameID, data, datatwo, model.VideoUrl, model.Afstudeerrichting);
            }
            catch (ArgumentException ae)
            {
                ModelState.AddModelError("", ae.Message);
            }
            return RedirectToAction("Index");
        }

        return View(model);
    }

将值发送到我的存储库，然后将其保存在我的数据库中。

这是我的DeliverableViewModel：

public class DeliverableViewModel
{
    [Required]
    [Display(Name = "Title")]
    public string Title { get; set; }

    [Required]
    [Display(Name = "Description")]
    public string Description { get; set; }

    [Required]
    [Display(Name = "Thumbnail")]
    public HttpPostedFileBase Thumbnail { get; set; }

    [Required]
    [Display(Name = "Image")]
    public HttpPostedFileBase Image { get; set; }

    [Required]
    [Display(Name = "VideoUrl")]
    public string VideoUrl { get; set; }

    [Required]
    [Display(Name = "AfstudeerrichtingID")]
    public int AfstudeerrichtingID { get; set; }

    [Required]
    [Display(Name = "Afstudeerrichting")]
    public IEnumerable<SelectListItem> Items { get; set; }

    public long UsernameID { get; set; }
}

有谁知道我必须在我的视图中添加什么？控制器使这项工作？

我的mysql数据库中的值在我的表格“Afstudeerrichtingen”中 - afstuddeerichting_id
- afstudeerrichting_name

Answer 1

在视图中添加下拉列表：

@Html.DropDownListFor(model => model.AfstudeerrichtingID, 
   new SelectList(ViewBag.Richtingen, 
    "AfstudeerrichtingId", "AfstudeerrichtingName"))

将Afstudeerrichting集合添加到控制器中的ViewBag：

ViewBag.Richtingen = afstudeerrichtingen;

假设该集合包含AfstudeerrichtingId和AfstudeerrichtingName属性，视图中使用。

要做的另一件事是将AfstudeerrichtingID更改为字符串，并将其转换为存储库类中的int。

将数据从db绑定到dropdownlist + ASP.NET MVC

1 个答案: