Asp.net mvc 从mvc中的FormCollection值获取Fileupload值

我正在尝试使用Form collection检查是否在mvc的fileupload中选择了该文件，但FormValue始终为空，fileupload没有将上载的文件名传递给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>

public ActionResult创建（FormCollection FormValue、IEnumerable文件、场地）
{
字符串[]图像={“”“”}；
int i=0；
//字符串图像；
//字符串大图像；
foreach（文件中的HttpPostedFileBase文件）
{
如果（文件！=null）
{
如果（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/”），文件名）；
file.SaveAs（路径）；
Helpers.ImageHelpers.ResizeImage（新文件名，路径，“/Content/images/Content/”，162105）；
图像[0]=新文件名；
vitune.ImageSmall=图像[0]；
//smallImage=“选定”；
}
如果（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/”），文件名）；
file.SaveAs（路径）；
Helpers.ImageHelpers.ResizeImage（新文件名，路径，“/Content/images/Content/”，212，240）；
图像[1]=新文件名；
VICENUE.ImageLarge=图像[1]；
//largeImage=“已选定”；
}
}
i++；
}
if（string.IsNullOrEmpty（formValues[“files1”]）| | string.IsNullOrEmpty（formValues[“files2”]））
{
AddModelError（“文件”，“请上传文件”）；
}
细节图像

您在html中使用了错误的ID（“files1”和“files2”），但是 代码中的“文件1”和“文件2”）

即使您使用了正确的ID， 此代码不起作用，因为表单参数是使用 来自“name”属性的值。因此，您必须创建一个唯一的名称 然后在代码中使用这些名称

---

如果你想循环文件。你可以给它们相同的id，然后在服务器端的控制器方法中使用

Request.files

属性。

我当前使用的是以下代码来处理用户通过多部分表单加载的文件

对我来说最关键的是，我没有模型，我有一个BusinessLogicLayer.dll文件作为我的模型，除了我项目中的一个程序员遇到的一些罕见的异常

这部分是视图的形式，为了简洁起见删除了大量代码，只保留了与此问题相关的内容

<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>

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
    }
}

这一轮代码还没有完全准备好供公众使用，但我知道这一点与我们的BLL和DAL结合起来确实有效

这是一个解决方案，允许公司客户在从网站订购时上传采购订单。如果您想循环浏览您的文件，可以返回到第二个代码栏，在检查您是否有文件后，可以循环浏览以进行处理

---

这是通过ASP、MVC 4、.NET Framework 4.6.1来完成的。很抱歉，这是一个打字错误，我无法更改名称，因为我正在传递文件IEnumerable files code updated…当我尝试将名称从文件更改为任何其他唯一名称时，foreach（文件中的HttpPostedFileBase文件）上会出现错误循环，对象引用未设置为对象的实例。请使用public ActionResult创建（FormCollection formValues、HttpPostedFileBase file1、HttpPostedFileBase file2、Venue-Venue）并在HtmlTill formValues[“file1”]中创建相同的2个名称，formValues[“file2”]为空。您不需要使用formValues数组。您必须使用Request.Files[0]，Reuqest.Files[1]等。。

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
    }
}