Get file names from multiple files uploaded

问题:

I have 4 fileupload in my form. I want when I click a button, I get the file name and set to model, then the file upload to server. But i don't want must use 4 file, I can use 3, 2, or 1 file upload at a time by choice. If I only use 2 file upload, file3 and file4 model still null. what I must do in my controller ?

Any ideas or suggestion?

Model:

public string file1 {get;set;}
public string file2 {get;set;}
public string file3 {get;set;}
public string file4 {get;set;}

View:

@using (Html.BeginForm("action", "controller", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="files" id="file1" />
    <input type="file" name="files" id="file2" />
    <input type="file" name="files" id="file3" />
    <input type="file" name="files" id="file4" />

    <input type="submit" />
}

回答1:

In Your View :

Note: Here your model names are not required. Through action result parameter you going to pass your files.

@using (Html.BeginForm("FileUpload", "Home",
                    FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="file1" id="file1" />
    <input type="file" name="file2" id="file2" />
    <input type="file" name="file3" id="file3" />
    <input type="file" name="file4" id="file4" />

    <input type="submit" value="Upload File" id="btnSubmit" />
}

In your Controller:

[HttpPost]
public ActionResult FileUpload(HttpPostedFileBase file1, HttpPostedFileBase file2, HttpPostedFileBase file3, HttpPostedFileBase file4) // OR IEnumerable<HttpPostedFileBase> files
{
    HttpPostedFileBase file1 = Request.Files["file1"];
    HttpPostedFileBase file2 = Request.Files["file2"];    
    HttpPostedFileBase file3 = Request.Files["file3"];
    HttpPostedFileBase file4 = Request.Files["file4"];

    if (file1 != null) // Same for file2, file3, file4
    {
        //If this is True, then file1 has file.,
    }

    // Check and Save the file1 // Same for file2, file3, file4
    if (file1.ContentLength > 0) 
    {
        string filePath = Path.Combine(HttpContext.Server.MapPath("../Uploads"),
                                       Path.GetFileName(uploadFile.FileName));
        uploadFile.SaveAs(filePath);
    }

    return View();
}

There is an article about file uploading in Codeproject. I didn't checked the above code. Let me know if that is not getting worked.