Question

我试图检查文件是否在mvc中的fileupload中使用Form集合选中但formvalues始终为null，fileupload没有将上传的文件名传递给formcollection，下面是代码：

   public ActionResult Create(FormCollection formValues,IEnumerable<HttpPostedFileBase> files, Venue venue)
    {
        string[] images = { "", "" };
        int i = 0;
     //   string smallImage;
      //  string largeImage;
        foreach (HttpPostedFileBase file in files)
        {
            if (file != null)
            {
                if (i == 0)
                {

                    string newFileName = string.Format("{0}{1}", Guid.NewGuid().ToString(), Path.GetExtension(file.FileName));
                    var fileName = Path.GetFileName(file.FileName);
                    var path = Path.Combine(Server.MapPath("~/Content/images/content/"), fileName);
                    file.SaveAs(path);
                    Helpers.ImageHelpers.ResizeImage(newFileName, path, "/Content/images/content/", 162, 105);
                    images[0] = newFileName;
                    venue.ImageSmall = images[0];
                //    smallImage = "selected";
                }

                if (i == 1)
                {

                    string newFileName = string.Format("{0}{1}", Guid.NewGuid().ToString(), Path.GetExtension(file.FileName));
                    var fileName = Path.GetFileName(file.FileName);
                    var path = Path.Combine(Server.MapPath("~/Content/images/content/"), fileName);
                    file.SaveAs(path);
                    Helpers.ImageHelpers.ResizeImage(newFileName, path, "/Content/images/content/", 212, 240);
                    images[1] = newFileName;
                    venue.ImageLarge = images[1];
                 //   largeImage = "selected";
                }

            }
            i++;
        }

        if (string.IsNullOrEmpty(formValues["files1"]) || string.IsNullOrEmpty(formValues["files2"])  )
        {

            ModelState.AddModelError("files", "Please upload a file");
        }

      <td>
                        <div class="editor-field">
                            <input type="file" name="files" id="files1" style="color:White" />


                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            Detail Image
                        </td>
                        <td>
                        <div class="editor-field">
                            <input type="file" name="files" id="files2" style="color:White"/>


                            </div>
                        </td>
                    </tr>

In the keys section there is no formvalue["files"]

Answer 1

您使用的是错误的ID（html中的“files1”和“files2”，但是代码中的“file1”和“file2”
即使您使用了正确的ID，此代码不起作用，因为表单参数使用命名 “name”属性中的值。因此，您必须创建一个唯一的名称对于html中的每个输入标记，然后在代码中使用这些名称。

如果您想循环文件。您可以为它们提供相同的ID，然后在服务器端的控制器方法中使用Request.Files属性。

Answer 2

我目前用于通过多部分表单处理来自用户的文件加载的是以下代码。

对我来说，最棘手的事实是，我没有Models，而是拥有BusinessLogicLayer.dll文件作为我的模型，除了一些罕见的例外，我的项目中的一位程序员遇到了这种例外。

这部分是“视图”的“表单”表单，为简洁起见，删除了大部分代码，但与该问题有关的内容却是这样。

<form id="payInfo" name="payInfo" action="@Url.Action("ShipMethod", "CheckOut")" method="post" enctype="multipart/form-data">

    <div id="12" class="custom-control custom-radio">
        <input type="radio" class="custom-control-input" id="payInvoice" name="payMethod" required />
        <!--on submit if this is selected, the customer will see a thank you as well as instructions on when/how the invoice will be available.-->
        <label class="custom-control-label" for="payInvoice">Send Invoice</label>
    </div>

    <div id="invoice" class="collapse img-thumbnail">                               
        <p class="h6 mb-2">You can provide the PO number on your Purchase Order, or you can accept the generated PO number that we have provided for you.</p>

        <div class="form-group row">
            <label for="invoicePO" class="col-2 col-form-label font-weight-bold">po number: </label>
            <div class="col-4"><!--Invoice name/prefill--></div>
            <div class="col-6">&nbsp;</div>
        </div>

        <div class="form-group row">
            <label for="POfile" class="col-2 col-form-label font-weight-bold">PO PDF: </label>
            <div class="col-4"><input type="file" class="form-control-file" id="POfile" name="POfile" /></div>
            <div class="col-6">&nbsp;</div>
        </div>
    </div>

    <button class="btn btn-secondary btn-lg btn-block" type="submit">Continue To Shipping</button>

</form>

从那里开始，表单由控制器处理（借助私有方法），如下面的代码所示。（还为简洁和相关性进行了编辑）

public ActionResult ShipMethod(FormCollection fc)
{
    // Gets the file(s) uploaded by the user using the form
    HttpFileCollectionBase file = Request.Files;

    // In this point I'm only looking for 1 file as that is all the user is allowed to upload
    if (file.Count == 1)
    {
        // This being the reference to the private method mentioned earlier
        /* We're passing the customer's cart and 
         * the file variable that was filled above as the Cart will be constant 
         * until the user confirms their purchase, making it ideal to hold on to 
         * the file details until the purchase is actually processed in the 
         * last step of the check out process. */
        GetPO(_cart, file);
    }
}

下面是实际处理上传文件的方法的代码。

private void GetPO(Cart _cart, HttpFileCollectionBase file)
{
    // Setting up a regEx to help me to restrict the kinds of files the user can upload to our server
    string fileRegEx = @"^.+\.((pdf))$";
    Regex regex = new Regex(fileRegEx, RegexOptions.IgnoreCase);

    // This gets just the filename and its extension instead of the fully qualified name
    // which we don't want when working with the RegEx comparison
    string fileName = Path.GetFileName(file[0].FileName);

    if (regex.IsMatch(fileName))
    {
        // If we're here, then the file name indicates that the file is a PDF
        if (file != null && file[0].ContentLength > 0)
        {
            // If we're here then there is actual substance to the file that was uploaded
            // So we'll need to make a byte array to temporarily 
            // hold the file contents before storage
            byte[] upload = new byte[file[0].ContentLength];

            // Get the File contents
            file[0].InputStream.Read(upload, 0, file[0].ContentLength);

            // Now that we have the contents, pass those contents on 
            // to the object that will hold onto it till the purchase 
            // is in the final stage of processing
            _cart.POContent = upload;

            // This section will get the other pertinent data pieces for storage
            // Get the index of the last period in the file name
            int lastIndex = fileName.LastIndexOf('.');
            // Get the file extension
            string ext = fileName.Substring(++lastIndex);

            // Get the POName and POContentType
            if (ext.ToLower() == "pdf")
            {
                // Get the Media Content Type
                _cart.POContentType = MediaContentType.PDF;
                // Get the name of the file without the extension
                _cart.POName = fileName.Remove(--lastIndex);
            }
            else
            {
                // TODO: Error handling for the wrong file extension
            }
        }
    }
    else
    {
        // TODO: Set up Error Handling for invalid or empty file
    }
}

这轮代码还没有完全准备好供公众使用，但是我知道很多事情与我们拥有的BLL和DAL一起使用。

这是我们提供的解决方案，允许公司客户在从网站订购时上传采购订单。如果您想循环浏览文件，可以返回到第二个代码blurb，并在检查完文件后，可以循环浏览以进行处理。

这是通过ASP，MVC 4，.NET Framework 4.6.1完成的

从mvc中的FormCollection值中获取Fileupload值

2 个答案: