[ASP.net MVC] 如何upload file並經controller 放於Network storage

View:
留意須要自行定義encType作multipart/form-data, 不然的話controller 不會接到file value.

@using (Html.BeginForm("CreatePost", "Email",FormMethod.Post, new { enctype= "multipart/form-data", id="formSendEmail" }))
{
    @Html.AntiForgeryToken()
    <div class="form-horizontal">
        <input type="file" id="attachments" name="attachments[]" multiple />
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create with file" class="btn btn-default" />
            </div>
        </div>
    </div>
}

Controller:
這裡用了賤招. 在Request.Files中取得file. 為什麼要這樣做呢? 因為若在Controller parameter 中call 入的話, 它只支援一個file. 若多於一個file 的話, 第二個file 也只會顯示第一個file的內容. 因此在這兒用了這個做work-around.

而在move file 時, 須留意UNC path 的user name, 若果會用AD / LDAP 的話, 須要準備user 的FQDN (e.g. [email protected]).

[HttpPost]
        public ActionResult CreatePost()
        {
            IList<HttpPostedFileBase> attachments = null;
            if (Request.Files.Count > 0)
            {
                attachments = new List<HttpPostedFileBase>();
                foreach (string fileName in Request.Files)
                {
                    attachments.Add(Request.Files[fileName]);
                }
            }
            string attachmentPath = ConfigurationManager.AppSettings["AttachmentCachePath"]
                            .Replace("[[REQUEST_DATETIME]]", DateTime.Now.ToString("yyyyMMddHHmmss"))
                            .Replace("[[RANDOM_STRING]]", this.RandomString(attachmentCachePathRandomStringSize)
                            );
                        foreach (HttpPostedFileBase attachment in attachments)
                        {
                            // Move file to target path.
                            string filePath = attachmentPath + @"\" + attachment.FileName;
                            using (NetworkShareAccesser.Access(ConfigurationManager.AppSettings["AttachmentCacheComputerName"], ConfigurationManager.AppSettings["AttachmentCachePathUserName"], ConfigurationManager.AppSettings["AttachmentCachePathUserPassword"]))
                            {
                                if (!Directory.Exists(attachmentPath))
                                    Directory.CreateDirectory(attachmentPath);
                                using (MemoryStream ms = new MemoryStream())
                                {
                                    attachment.InputStream.CopyTo(ms);
                                    System.IO.File.WriteAllBytes(filePath, ms.ToArray());
                                }
                            }

        }