asp.net - 您如何识别来自多个 html 文件输入的文件？

Question

我目前有一个包含多个文件输入的表单：

Resume: <input type="file" id="resume" name ="files" /><br />
Cover Letter: <input type="file" id="coverLetter" name ="files" /><br />

在我的后端：

[HttpPost]
public ActionResult Apply(ApplyModel form, List<HttpPostedFileBase> files) 
{
    if (!ModelState.IsValid)
    {
        return View(form);
    }
    else if (files.All( x => x == null))
    {
       ModelState.AddModelError("Files", "Missing Files");
       return View(form);
    }
    else
    {
        foreach (var file in files)
        {
            if (file.ContentLength > 0)
             {
                var fileName = Path.GetFileName(file.FileName);
                var path = Path.Combine(Server.MapPath("~/uploads"), fileName);
                file.SaveAs(path);
                <!--- HERE -->
            }
        }
    }
}

我的问题是如何确定文件是来自 id resume 还是 coverLetter 在此处评论处。

Answer 1

你无法识别它。您需要使用不同的名称：

Resume: <input type="file" id="resume" name="coverLetter" /><br />
Cover Letter: <input type="file" id="coverLetter" name="resume" /><br />

进而：

[HttpPost]
public ActionResult Apply(ApplyModel form, HttpPostedFileBase coverLetter, HttpPostedFileBase resume)
{
    ... now you know how to identify the cover letter and the resume
}

并避免大量动作参数使用视图模型：

public class ApplicationViewModel
{
    public ApplyModel Form { get; set; }
    public HttpPostedFileBase CoverLetter { get; set; }
    public HttpPostedFileBase Resume { get; set; }
}

进而：

[HttpPost]
public ActionResult Apply(ApplicationViewModel model)
{
    ... now you know how to identify the cover letter and the resume
}