vs2013 上传碰到的问题：“输入的不是有效的 Base-64 字符串 ”

action 代码：

      [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(  ImageStoreModels imagestoremodels)
        {
            if (ModelState.IsValid)
            {
                if (Request.Files["ImageData"].ContentLength <= 0) return View();

                imagestoremodels.ID = Guid.NewGuid();

                HttpPostedFileBase aFile = Request.Files["ImageData"];
                int contentLength = aFile.ContentLength;
                byte[] bytePic = new byte[contentLength];
                aFile.InputStream.Read(bytePic, 0, contentLength);
                imagestoremodels.ImageData =  bytePic;
                imagestoremodels.ImageName = aFile.FileName;
                //imagestoremodels.ImageCataloge = e_ImageCataloge.;
                //imagestoremodels.ImageAlt = "";
                imagestoremodels.ContentType = aFile.ContentType;


                db.ImageStoreModels.Add(imagestoremodels);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(imagestoremodels);

        }

view 代码

@using (Html.BeginForm("Create", "ImageStore", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">
        <h4>ImageStoreModels</h4>
        <hr />
        @Html.ValidationSummary(true)

        <div class="form-group">
            @Html.LabelFor(model => model.ImageCataloge, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                 
                @Html.DropDownListForEnum(model => model.ImageCataloge)
                @Html.ValidationMessageFor(model => model.ImageCataloge)
            </div>
        </div>

   

 

        <div class="form-group">
            @Html.LabelFor(model => model.ImageData, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @*@Html.TextBoxFor(model => model.ImageData, new { type = "file",  style="none"})*@
                 
                <input name="ImageData" type="file"  />  
                @Html.ValidationMessageFor(model => model.ImageData)

                <input name="ImageData" id="ImageData" type="file" />
            </div>
        </div>


        <div class="form-group">
            @Html.LabelFor(model => model.ImageAlt, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ImageAlt)
                @Html.ValidationMessageFor(model => model.ImageAlt)
            </div>
        </div>


        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}

提交图片， 上传的时候，总是报：　输入的不是有效的 Base-64 字符串　　　　的错误。

后来，在网上才找到答案：

http://stackoverflow.com/questions/3294023/input-file-autobind-to-byte-aray-in-asp-net-mvc