c# - 部分查看文件上传

Question

我正在尝试弄清楚如何使用局部 View 存储多个文件。可以看到局部 View 的截图 here .

只要我使用常规表单输入，部分 View 本身就可以完美运行。然而，存储文件有点复杂。由于我使用的是 Entity First，因此我只是存储对文件的引用而不是实际文件本身。这适用于单个文件。字节引用存储到我的数据库中，我可以在显示特定记录的所有属性的 View 中生成文件链接。但是，如果我想要多次上传，我对如何解决这个问题一无所知。每添加一行一个。

我也不确定我应该如何通过 jQuery 定位某一行的单独字段，因为所有行都是动态生成的，但这是一个不同的问题。

相关代码:

我的 Controller 的 POST 操作:

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult CreateSrv([Bind(Include = "ID,CreationTimestamp,EditTimestamp,requestStatus,Requester,Reponsible,DeliveryDate,Project,CostCenter, MailCounter, ExtendedOrders")] Request request, HttpPostedFileBase upload)
    {
        
        if (ModelState.IsValid)
        {
            if (upload != null && upload.ContentLength > 0)
            {
                if (upload.ContentLength > 0)
                {
                    var fileName = Path.GetFileName(upload.FileName);
                    var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
                    upload.SaveAs(path);

                    using (var reader = new System.IO.BinaryReader(upload.InputStream))
                    {
                        request.ExtendedOrders.ToArray()[0].File = reader.ReadBytes(upload.ContentLength);
                    }
                }                    
            }

            request.CreationTimestamp = DateTime.Now;
            request.EditTimestamp = DateTime.Now;
            request.RequestStatus = "Initial";
            request.RequestType = "Services";
            db.requests.Add(request);
            db.SaveChanges();

            return RedirectToAction("Index");
        }
        return View(request);
    }
    

使用 AJAX 向我的局部 View 添加行的 Controller 方法:

    [HttpGet]
    public ActionResult AddOrderRowExtended()
    {
        OrderExtended order = new OrderExtended();
        order.Units = GetSelectListItems(GetUnitsFromDB());
        order.Unit = "PC";
        order.Currencies = GetSelectListItems(GetCurrenciesFromDB());
        order.Currency = "European Euro";
        return PartialView("~/Views/Orders/OrderExtendedCreate.cshtml", order);
    }       
    
    

然后我在“主” View 中调用局部 View 。 addOrder 按钮动态添加更多行:

@using (Html.BeginForm("CreateSrv", "Requests", null, FormMethod.Post, new { enctype = "multipart/form-data" }))
{
@Html.AntiForgeryToken()


<div class="form-horizontal">
... some fields of my Request model...

            <tbody id="OrderZone">
            @foreach (var row in Model.ExtendedOrders)
            {
                Html.RenderPartial("~/Views/Orders/OrderExtendedCreate.cshtml", row);
            }
        </tbody>
    <button class="btn btn-sm btn-success" type="button" id="addOrder">Add row</button>
    <br />
    <div class="body-content">
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>      
</div>

我的 OrderExtended 模型:

public class OrderExtended
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ID { get; set; }


   ....

    [NotMapped]
    [DataType(DataType.Upload)]
    public HttpPostedFileBase Quotation { get; set; }

    public byte[] File { get; set; }

    //FK
    public int RequestRefId { get; set; }

    [ForeignKey("RequestRefId")]
    public virtual Request Request { get; set; }
}

OrderExtendedCreate.cshtml

@model RFP_MVC.Models.OrderExtended
 


<tr class="editorRow">
    @using (Html.BeginCollectionItem("ExtendedOrders"))
    {
        <td class="col-md-2">@Html.EditorFor(model => model.Material, new { htmlAttributes = new { @class = "input-sm form-control" } })</td>
        <td class="col-md-1">@Html.EditorFor(model => model.Quantity, new { htmlAttributes = new { @class = "input-sm form-control" } })</td>
        <td class="col-md-2">@Html.DropDownListFor(model => model.Unit, Model.Units, new { id = "Unit", @class = "input-sm form-control select2" })</td>
        <td class="col-md-2">@Html.DropDownListFor(model => model.PurchGroup, Model.PurchGroupList, "Select...", new { @class = "input-sm form-control" })</td>
        <td class="col-md-2">
            <div class="input-group">
                <span class="input-group-btn">
                    <button class="btn btn-sm btn-default" type="button" data-toggle="modal" data-target="#myModal"><span class="glyphicon glyphicon-search"></span></button>
                </span>
                @Html.EditorFor(model => model.Vendor, new { htmlAttributes = new { id = "Vendor" , @class = "input-sm form-control" } })
            </div>
        </td>
        <td class="col-md-1">@Html.EditorFor(model => model.OrderingCode, new { htmlAttributes = new { @class = "input-sm form-control" } })</td>
        <td class="col-md-1">@Html.EditorFor(model => model.Price, new { htmlAttributes = new { @class = "input-sm form-control" } })</td>
        <td class="col-md-1">@Html.DropDownListFor(model => model.Currency, Model.Currencies, new { id = "Currency", @class = "input-sm form-control select2" })</td>
        <td class="col-md-2">
            <span class="btn btn-sm btn-default btn-file glyphicon glyphicon-folder-open"><input type="file" name="upload"></span>
        </td>
    }
</tr>

提前致谢

更新了解决方案:

更改了我的 POST 方法

1. 将参数更改为 IEnumerable(按照 ramiramilu 的建议):

   IEnumerable 文件

2. 遍历所有文件并处理它们:

int fileIndex = 0;
foreach (HttpPostedFileBase upload in files)
{
    if (upload != null && upload.ContentLength > 0)
    {   
        var fileName = Path.GetFileName(upload.FileName);
        var path = Path.Combine(Server.MapPath("~/uploads"), fileName);
        upload.SaveAs(path);

        using (var reader = new System.IO.BinaryReader(upload.InputStream))
        {
            request.ExtendedOrders.ToArray()[fileIndex].File = reader.ReadBytes(upload.ContentLength);
        }

        fileIndex++;
    }
}

Answer 1

如果你想上传多个文件，你需要期待 IEnumerable<HttpPostedFileBase> upload作为您的操作的参数。一旦你得到 IEnumerable<HttpPostedFileBase> upload , 使用 foreach并保存每个文件。