如何将Dropzone.js与ASP.NET核心MVC集成？

Question

我想使用IFormFile在我的数据库中上传一些文档。在客户端，我使用的是Dropzone.js，但它不能正常工作。每当我点击Submit按钮时，它都会在参数中发送一个空值。我有两个问题。1.如何将文档(图像/PDF)发送到动作方法。2. Dropzone的重新设计(改变风格)。(如果有人解释了滴区的流动，那就非常有用了)

这是我的HTML代码

<form asp-action="AddDocument" asp-controller="Transactions" method="post" enctype="multipart/form-data" class="dropzone dz-clickable form-horizontal form-bordered" id="dropzoneForm">
    <div class="form-group form-actions">
        <div class="col-md-9 col-md-offset-4">
            <button type="submit" class="btn btn-sm btn-primary"><i class="fa fa-floppy-o"></i> Upload</button>
        </div>
    </div>
</form> 

“联合来文法典”：

$(function () {
            Dropzone.options.dropzoneForm = {
                paramName: "DocumentPhotos", // The name that will be used to transfer the file
                autoProcessQueue: false,
                uploadMultiple: true,
                parallelUploads: 100,
                accept: function (file, done) {
                    done();
                }
            };
        });

下面是我的服务器端语言代码：

        [HttpPost]
        public async Task<IActionResult> AddDocument(IEnumerable<IFormFile> DocumentPhotos)
        {

            if (DocumentPhotos!= null)
            {
                TransactionViewModel viewModel = new TransactionViewModel();
                var documentModel = viewModel.TransactionModel.TransactionDocuemnt;
                foreach (var item in DocumentPhotos)
                {

                    using (MemoryStream stream = new MemoryStream())
                    {
                        await item.CopyToAsync(stream);
                        documentModel.DocumentPhoto = stream.ToArray();
                    }
                    documentModel.DocumentName = item.FileName;
                    documentModel.SrNo = 1;
                    documentModel.SocietyRid = UserSessionState.ApplicationUser.SocietyRid;
                }
            }

            return PartialView("TransactionDocumentForm", transactionViewModel);
        }

使用的脚本和CSS (所有文件都从Dropzone.js下载)：

<link rel="stylesheet" href="~/css/basic.css" />
<link rel="stylesheet" href="~/css/dropzone.css" />
<script type="text/javascript" src="~/js/dropzone.js"></script>
<script type="text/javascript" src="~/js/dropzone-amd-module.js"></script>

Answer 1

如果将选项uploadMultiple设置为true，则Dropzone将将[]附加到paramName。在查看了来自html5多文件上载的请求之后，我注意到请求没有向文件名( file N)添加索引。Dropzone.js是这样做的，所以有一个工作要做。如果将paramName选项添加到Dropzone JS配置中，并让它调用返回文件的方法，您将得到与html5多文件上传相同的行为。您还可以参考此链接获得有关Dropzone.js配置选项的更多细节。

function myParamName() {
    return "DocumentPhotos";
}

Dropzone.options.dropzoneForm = {
   paramName: myParamName, 
   //other configuration options
}

autoProcessQueue: false告诉Dropzone在删除文件时不要自动上传它，因为默认情况下它会上传。由于Dropzone现在不会自动上传文件，所以当您单击按钮时，需要手动告诉它这样做。因此，您需要一个事件处理程序来单击该按钮，它告诉Dropzone进行上传：

 <button type="submit" id="submit" class="btn btn-sm btn-primary"><i class="fa fa-floppy-o"></i> Upload</button>

 var wrapperThis = this;

 $("#submit").click(function (e) {
       e.preventDefault();
       wrapperThis.processQueue();
 });

完整代码

<form asp-action="AddDocument" asp-controller="Home" method="post" enctype="multipart/form-data" class="dropzone dz-clickable form-horizontal form-bordered" id="dropzoneForm">
  <div class="form-group form-actions">
    <div class="col-md-9 col-md-offset-4">
        <button type="submit" id="submit" class="btn btn-sm btn-primary"><i class="fa fa-floppy-o"></i> Upload</button>
    </div>
  </div>
</form>

@section Scripts
{
  <link rel="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.5.1/dropzone.css" />
  <script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.5.1/dropzone.js"> </script>
  <script>
       function myParamName() {
           return "DocumentPhotos";
        }
        Dropzone.options.dropzoneForm = {
            autoProcessQueue: false,
            paramName: myParamName, // The name that will be used to transfer the file
            uploadMultiple: true,
            parallelUploads: 100,
            init: function () {
                console.log("active");
                var wrapperThis = this;

                $("#submit").click(function (e) {
                    e.preventDefault();
                    wrapperThis.processQueue();
                });
            },
            accept: function (file, done) {
                done();
            }
        };

</script>
}