Question

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我想在下拉列表中获取所选项目的值。我使用以下代码将文件保存到数据库中：

public ActionResult UploadDoc(IEnumerable<HttpPostedFileBase> files)
{
    foreach (var file in files)
    {
        if (file != null && file.ContentLength > 0)
        {
            byte[] data = new byte[file.ContentLength];
            file.InputStream.Read(data, 0, file.ContentLength);

            Document doc = new Document
            {
                UploadedOn = DateTime.Now,
                MimeType = file.ContentType,
                UserName = User.Identity.Name,
                Data = data,
                FromLanguage = 1,
                ToLanguage = 2
            };

            dbContext = new MedicalDb();
            dbContext.Documents.Add(doc);
            dbContext.SaveChanges();
        }
    }
    return RedirectToAction("Index");
}

但是，我还希望从下拉列表中获取所选值，以便我可以填充文档的FromLanguage和ToLanguage属性。我想我需要一个viewmodel，但不知道该怎么做。使用jQuery添加用于文档上载的新行，并且ddls的名称是“ddlFromLanguage1”，“ddlFromLanguage2”，“ddFromLanguage3”，“ddlToLanguage1”，“ddlToLanguage2”，“ddlToLanguage3”等。预先感谢您的任何帮助。< / p>

<form action="UploadDoc" method="post" enctype="multipart/form-data">    
<table id="tblUploadDocs">
    <tr id="row1">
        <td><input type="file" name="files" id="file1" /></td>
        <td>Bu dilden</td>
        <td>@Html.DropDownList("ddlFromLanguage1", ViewBag.Languages as SelectList)</td>
        <td>şu dile çevrilecek</td>
        <td>@Html.DropDownList("ddlToLanguage1", ViewBag.Languages as SelectList)</td>
    </tr>
</table>
<br />
<a href="javascript:addRow();" style="margin:10px 0;">Yeni dosya ekleyin</a>
<input type="submit"  />
</form>

Answer 1

我认为你需要看看好的例子并做同样或非常相似的事情。

看看这些：

这些应该让你去。

如果你没有成功，或者我给你的东西实际上有帮助，请告诉我。

由于

Answer 2

除了与模型相关的值之外，任何回发的表单都会将FormCollection返回给控制器。

例如

  //In your view
  @using (Html.BeginForm("CountrySelect", "Country", FormMethod.Post))
            {
                @Html.AntiForgeryToken()
                <select name="country" id="country-select">
                   <option value="selector">Pick a Country</option>
                   <option value="England">England</option>
                   <option value="England">England</option> 
                </select>         
            }

//In controller
//This will get you the name of the selected country from your form
[HttpPost]
Public ActionResult CountrySelect(FormCollection formData)
{
   string country = formData["country"].toString();
}

Answer 3

解决方案：

viewmodel：

public class CustomerDocUploadViewModel
{
    public HttpPostedFileBase File { get; set; }
    public int FromLanguage { get; set; }
    public int ToLanguage { get; set; }
}

观点：

@model IList<Models.ViewModels.CustomerDocUploadViewModel>

...

<form action="UploadDoc" method="post" enctype="multipart/form-data">    
<table id="tblUploadDocs">
    <tr id="row1">
        <td><input type="file" name="[0].File" /></td>
        <td>Bu dilden</td>
        <td>@Html.DropDownList("[0].FromLanguage", ViewBag.Languages as SelectList)</td>
        <td>şu dile çevrilecek</td>
        <td>@Html.DropDownList("[0].ToLanguage", ViewBag.Languages as SelectList)</td>
    </tr>
</table>
<br />
<a id="lnkAdd" href="javascript:addRow();" style="margin:10px 0;">Yeni dosya ekleyin</a>
<input type="submit"  />
</form>

最后是控制器中的action方法：

[HttpPost]
    public ActionResult UploadDoc(IList<CustomerDocUploadViewModel> docInfos)
    {
        for (int i = 0; i < docInfos.Count; i++)
        {
            if (docInfos.ElementAt(i).File != null && docInfos.ElementAt(i).File.ContentLength > 0)
            {
                byte[] data = new byte[docInfos.ElementAt(i).File.ContentLength];
                docInfos.ElementAt(i).File.InputStream.Read(data, 0, docInfos.ElementAt(i).File.ContentLength);

                // Save the file into the database
                Document doc = new Document
                {
                    UploadedOn = DateTime.Now,
                    MimeType = docInfos.ElementAt(i).File.ContentType,
                    UserName = User.Identity.Name,
                    Data = data,
                    FromLanguage = docInfos.ElementAt(i).FromLanguage,
                    ToLanguage = docInfos.ElementAt(i).ToLanguage
                };

                dbContext = new MedicalDb();
                dbContext.Documents.Add(doc);
                dbContext.SaveChanges();
            }
        }    
        return RedirectToAction("Index");
    }

使用ViewModel从SelectList项传递值

3 个答案: