Question

我正在使用ASP.NET MVC 5并拥有这个简单的ViewModel。

public class ArtistVM
{
    public string FName { get; set; }
    public string LName { get; set; }
    public HttpPostedFileBase ImgUpload { get; set; }
}

我知道我需要HttpPostedFileBase的自定义编辑器模板，所以我已经将HttpPostedFileBase.cshtml添加到~/Views/Shared/EditorTemplates/里面，我有以下内容：

@model HttpPostedFileBase

@Html.TextBoxFor(model => model, new { type = "file" })

就显示类型文件的输入而言，这似乎工作正常！

问题出现在发布和绑定时，我的ImgUpload属性总是返回null，这告诉我在编辑模板中有些不对。

新艺术家视图的代码如下所示：

@using (Html.BeginForm("New", "Artist", FormMethod.Post, new { encrypt = "multipart/form-data"})) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.FName, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.FName, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.FName, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.LName, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.LName, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.LName, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ImgUpload, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ImgUpload, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.ImgUpload, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Add Artist" class="btn btn-primary" />
            </div>
        </div>
    </div>
}

处理帖子的Controller Action是：

[HttpPost]
public ActionResult New(ArtistNewVM vm)
{
    var validImageTypes = new string[]
    {
        "image/gif",
        "image/jpeg",
        "image/pjpeg",
        "image/png"
    };

    if (vm.ImgUpload == null || vm.ImgUpload.ContentLength == 0)
    {
        // ** gets inside here **
        ModelState.AddModelError("ImageUpload", "This field is required");
    }
    else if (!validImageTypes.Any(vm.ImgUpload.ContentType.Contains))
    {
        ModelState.AddModelError("ImageUpload", "Please choose either a GIF, JPG or PNG image.");
    }

    if (ModelState.IsValid)
    {
        // do the magic
    }

    return View(vm);
}

Answer 1

您的表单中的html属性有误enctype代表＆＃34;编码类型＆＃34; 不是encrypt see here

enctype属性的目的是指示在将表单数据发送到action属性中定义的位置之前应如何编码表单数据。

变化：

new { encrypt = "multipart/form-data"}

为：

new { enctype = "multipart/form-data"}

ASP.NET MVC中的HttpPostedFileBase编辑器模板

1 个答案: