Question

在这里，我的cshtml.cs文件用于上传图片并为我的网站添加图片。

@using (Html.BeginForm("Logo", "Header", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <div class="col-md-12">
        <div class="panel">
            <div class="panel-heading">
                <h2>Logo</h2>
            </div>
            <div class="panel-body">
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Logo Image<span style="color:red;">*</span>:</label>
                        @Html.HiddenFor(model => model.logoId)
                        @Html.TextBoxFor(model => model.LogoImage, new { @type = "file", @Id = "Files" })
                        @Html.ValidationMessageFor(model => model.LogoImage)
                    </div>
                    <span style="color:red;">Note:Please Upload Maximum Image size is 6 MB!!</span><br />
                    <span style="color:red;">Note:Allowed Image size Height: 45px, Width: 192px</span>
                    <div class="form-group">
                        <input type="submit" name="submit" value="Upload" class="btn btn-sm btn-primary" />
                    </div>
                </div>
                <div class="col-md-6">
                    <img id="Logo" alt="Logo-Preview" name="LogoImage" class="prev" style="width:192px;height:45px;" />
                </div>
            </div>
        </div>
    </div>
}

在这里，当我上传任何文件或图像时，HttpPostedFileBase文件重新调整始终为null。

我尝试了所有从MVC研究中学到的东西，但是没有用，所以我该如何解决。在设计方面，我正在使用模型获取数据并传递数据

[HttpPost]
        public ActionResult Logo(HttpPostedFileBase file, LogoViewModel model)
        {
            if (ModelState.IsValid)
            {
                if (Helper.IsValidImageFile(file.FileName))
                {
                    LogoMaster objlogo = new LogoMaster();
                    try
                    {
                        if (file != null)
                        {
                            string filename = Helper.ToValidFileName(Path.GetFileName(file.FileName));
                            string path = Path.Combine(Server.MapPath("~/Images/" + filename));
                            string filepathtosave = "~/Images/" + filename;
                            file.SaveAs(path);
                            objlogo.LogoImage = filepathtosave;
                        }
                        var IsExist = from i in _DBContext.LogoMasters select i;
                        if (IsExist.Count() > 0)
                        {
                            var Update = _DBContext.LogoMasters.First(x => x.LogoId == IsExist.FirstOrDefault().LogoId);
                            Update.LogoImage = objlogo.LogoImage;
                            _DBContext.SaveChanges();
                            return View();
                        }
                        else
                        {
                            objlogo.LogoImage = model.LogoImg;
                            if (model.logoid == null)
                                _DBContext.LogoMasters.Add(objlogo);
                            _DBContext.SaveChanges();
                            ModelState.Clear();
                        }
                    }
                    catch (Exception ex)
                    {
                        throw ex;
                    }
                }
            }
            return View();

        }

Answer 1

这很简单，我犯了一个我看到你的错误，只需将其应用即可运行。

@using (Html.BeginForm("Logo", "Header", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <div class="col-md-12">
        <div class="panel">
            <div class="panel-heading">
                <h2>Logo</h2>
            </div>
            <div class="panel-body">
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Logo Image<span style="color:red;">*</span>:</label>
                        @Html.HiddenFor(model => model.logoId)
                        @Html.TextBoxFor(model => model.LogoImage, new { @type = "file", @Id = "Files" })
                        @Html.ValidationMessageFor(model => model.LogoImage)
                    </div>
                    <span style="color:red;">Note:Please Upload Maximum Image size is 6 MB!!</span><br />
                    <span style="color:red;">Note:Allowed Image size Height: 45px, Width: 192px</span>
                    <div class="form-group">
                        <input type="submit" name="submit" value="Upload" class="btn btn-sm btn-primary" />
                    </div>
                </div>
                <div class="col-md-6">
                    <img id="Logo" alt="Logo-Preview" name="LogoImage" class="prev" style="width:192px;height:45px;" />
                </div>
            </div>
        </div>
    </div>
}

只需将名称用HttpPostedFileBase文件替换为HttpPostedFileBase LogoImage即可

[HttpPost]
        public ActionResult Logo(HttpPostedFileBase LogoImage, LogoViewModel model)
        {
...
//your code
...

return View();

        }

Answer 2

在您的视图中像这样的示例添加enctype="multipart/form-data"

<form action="/Account/Register" method="post" enctype="multipart/form-data">

   <input type="file" name="file"/>

</form>

HttpPostedFileBase retun null始终在控制器发布方法中

2 个答案: