ASP.NET MVC上傳文件的幾種方法

1.Form表單提交

<p>Form提交</p>
<form action="@Url.Action("SavePictureByForm")" enctype="multipart/form-data" method="post">
    <input id="pic" name="pic" type="file" />
    <input type="submit" value="提交" />
</form>

2.Ajax.BeginForm,原理也是Form表單提交

<p>Ajax.BeginForm</p>
@using(Ajax.BeginForm("SavePictureByForm", null, new AjaxOptions() { OnSuccess = "PostSuc", OnFailure = "PostFail", HttpMethod = "Post"}, new {enctype = "multipart/form-data"}))
{
   <input type="file" name="pic" id="pic" multiple="multiple" />
   <input type="submit" value="提交" />
}

以上兩種方式,在後臺用同一種方法能夠獲取數據: 可是這兩種方法會形成頁面刷新,有時會影響用戶操做.

 public ActionResult SavePictureByForm()
        {
            HttpFileCollectionBase files = Request.Files;
            var file = files[0];
            bool isOk = false;
            string msg = string.Empty;
            //....OtherDO


            return Content("<script>window.location.href='/home/index';</script>");
        }

3.Ajax提交  用此方法須要用到FileReader類,再獲取到文件的Base64數據,將Base64數據Post過去

<p>Ajax:以上傳圖片爲例</p>
<input type="file" id="picAjax"/>
<input type="button" id="submitPic" value="提交" />
<img id="selImg"  src="" alt="用做圖片預覽" />

    var picString = "";
    $(function () {
        $("#picAjax").change(function (e) {
            var file = e.delegateTarget.files[0];
            //在此能夠對選擇的文件進行判斷:文件類型 文件大小等
            //.....
            
            var reader = new FileReader();
            reader.readAsDataURL(file);
            reader.onload = function (ret) {
                picString = reader.result
                //預覽圖片
                $("#selImg").attr({ "src": picString });
            }
        });

        $("#submitPic").click(function () {
            $.ajax("home/SavePicture", {
                type: "post",
                datatype: "json",
                data: picString,
                error: function () { },
                success: function (result) {
                    if (result) {
                        alert(result.msg);
                    }
                }
            });
        });

後端接收

 [HttpPost]
        public ActionResult SavePicture(string picString)
        {
            bool isOk = false;
            string msg = string.Empty;
            //其餘操做
            //.........
            //.........
            return Json(new { suc = isOk, msg = msg });
        }

第三種方法作到了真正異步提交.可是若是選擇的文件較大,可能會出現問題(未測試).

 

對於圖片預覽 前兩種方法也可用base64數據進行圖片預覽.