用MVC表单上传

本文关键字:表单 MVC | 更新日期: 2023-09-27 18:18:39

我有一个简单的问题。为什么在下面的代码中,这部分- HttpPostedFileBase file -是空的?当然ArticleModel model不是空的,只有file

开始我的控制器动作:

public ActionResult Add(ArticleModel model, HttpPostedFileBase file)
...

我的形式:

<section id="">
@using (Html.BeginForm()) {
    @Html.AntiForgeryToken()
    @Html.ValidationSummary()
    @ViewBag.Status

    <fieldset>
        <legend>Add</legend>
        <ol>
            <li>
                @Html.LabelFor(m => m.title)
                @Html.TextBoxFor(m => m.title)
            </li>
            <li>
                @Html.LabelFor(m => m.Categories)
                @Html.DropDownListFor(m=> m.categoryID, Model.Categories, "- lorem -", new { @class="dropdownlist" })
            </li>
            <li>
                @Html.LabelFor(m => m.connectedArticlesID)
                @Html.TextBoxFor(m => m.connectedArticlesID)
            </li>
            <li>
                 <input type="file" name="file" id="file" />
            </li>
            <li>
                @Html.LabelFor(m => m.introduction)
                @Html.EditorFor(m => m.introduction)
            </li>
            <li>
                @Html.LabelFor(m => m.content)
                @Html.EditorFor(m => m.content)
            </li>
        </ol>
        <input type="submit" value="Add" />
    </fieldset>
}
</section>
编辑:

我的模型
public class ArticleModel
{
    [Display(Name = "Number")]
    public int articleID { get; set; }
    [Required]
    [Display(Name = "Tilte")]
    [StringLength(250, ErrorMessage = "Tytuł musi mieć długość od {0} do {2} znaków.", MinimumLength = 6)]
    public string title { get; set; }
    [Required]
    [Display(Name = "Similar articles")]
    public string connectedArticlesID { get; set; }
    [Display(Name = "CategoryName")]
    public string category { get; set; }
    [Required]
    [Display(Name = "Category")]
    public int categoryID { get; set; }
    [Required]
    [Display(Name = "Category")]
    public IEnumerable<SelectListItem> Categories
    {
        get
        {
            return new[]
            {
                new SelectListItem { Value = "1", Text = "Kategoria pierwsza" },
                new SelectListItem { Value = "2", Text = "Kategoria druga" },
                new SelectListItem { Value = "3", Text = "Kategoria trzecia" },
            };
        }
    }
    [Display(Name = "Content")]
    [Required]
    [StringLength(6000, ErrorMessage = "Treść musi mieć długość od {1} do {2} znaków.", MinimumLength = 30)]
    [UIHint("tinymce_jquery_full"), AllowHtml]
    public string content { get; set; }
    [Display(Name = "Introduction")]
    [Required]
    [StringLength(6000, ErrorMessage = "Wstęp musi mieć długość od {1} do {2} znaków.", MinimumLength = 30)]
    [DataType(DataType.MultilineText)]
    public string introduction { get; set; }
}

用MVC表单上传

我有一个简单的问题。为什么在下面的代码中,这部分- httppostdfilebase文件-是空的?

因为你没有在你的表单上设置enctypemultipart/form-data:

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

参考:http://haacked.com/archive/2010/07/16/uploading-files-with-aspnetmvc.aspx

在您将Html.BeginForm切换到Ajax.BeginForm之前,然后问为什么HttpPostedFileBase file - is null,答案是您不能使用AJAX上传文件。你将不得不使用文件上传插件,如Uploadify或Blueimp文件上传。我提到这件事只是为了记录,以避免进一步可能的重复问题。


更新:

根据注释部分的要求,您可以将文件字段添加到视图模型中:

public class ArticleModel
{
    [Required]
    public HttpPostedFileBase File { get; set; }
    ...
}

然后让你的控制器动作直接把这个视图模型作为参数并去掉HttpPostedFileBase参数:

public ActionResult Add(ArticleModel model)
{
    if (ModelState.IsValid)
    {
        ... work with model.File directly here
    }
}

同样为了避免域模型和视图模型之间的任何歧义,我将它们后缀为ViewModel:

public class ArticleViewModel
{
    ...
}