使用ajax表单上传mvc3文件 – Request.Files为空

我正在使用mvc3,并试图在一个页面内创建一系列ajax表单,每个表单都上传一个文件.这是该页面的视图：

@{
    ViewBag.Title = "Index";
}
<h2>
    Index</h2>

    @Html.Partial("_UploadItem")
    @Html.Partial("_UploadItem")
    @Html.Partial("_UploadItem")

<script type="text/javascript">
    function Go() {
        // loop through form tags
        for (var n = 0; n < document.forms.length; n++) {
            var f = document.forms[n];
            // if a dress is chosen,a caption is chosen
            // and a file is chosen,then submit the ajax form
            if (f.dressid.value != '' &&
               f.dresscaption.value != '' &&
               f.fileitem.value != '')
                f.submit();
        }
    }
</script>
<input type="button" onclick="Go();"/>

然后Go()函数循环遍历ajax表单,检查每个表单上的所有3个部分(dressid,dresscaption和fileitem)是否为非空,并且调用提交表单,启动异步上载.

这是局部视图：

@using SoRefeising.Models
@using (Ajax.BeginForm("UploadFile",new { },new AjaxOptions { HttpMethod = "POST" },new { enctype="multipart/form-data"}))
{
    List<SelectListItem> items = (List<SelectListItem>)ViewBag.Dresses;

    <span>Dress</span>
    @Html.DropDownList("dressid",items,"Choose Dress");
    <span>Caption</span>
    @Html.TextBox("dresscaption")
    <input type="file" id="fileitem" />    
}

我用multipart属性标记了每个表单.生成页面时,我得到以下内容：

<form action="/upload/UploadFile" data-ajax="true" data-ajax-method="POST" enctype="multipart/form-data" id="form0" method="post">    <span>Dress</span>
<select id="dressid" name="dressid"><option value="">Choose Dress</option>
<option value="1">Simpson01</option>
<option value="2">Simpson02</option>
</select>    <span>Caption</span>
<input id="dresscaption" name="dresscaption" type="text" value="" />    <input type="file" id="fileitem" />    
</form>

    <form action="/upload/UploadFile" data-ajax="true" data-ajax-method="POST" enctype="multipart/form-data" id="form1" method="post">    <span>Dress</span>
<select id="dressid" name="dressid"><option value="">Choose Dress</option>
<option value="1">Simpson01</option>
<option value="2">Simpson02</option>
</select>    <span>Caption</span>
<input id="dresscaption" name="dresscaption" type="text" value="" />    <input type="file" id="fileitem" />    
</form>

    <form action="/upload/UploadFile" data-ajax="true" data-ajax-method="POST" enctype="multipart/form-data" id="form2" method="post">    <span>Dress</span>
<select id="dressid" name="dressid"><option value="">Choose Dress</option>
<option value="1">Simpson01</option>
<option value="2">Simpson02</option>
</select>    <span>Caption</span>
<input id="dresscaption" name="dresscaption" type="text" value="" />    <input type="file" id="fileitem" />    
</form>

一切看起来都不错……

这是被调用的控制器动作

[HttpPost]
        public ActionResult UploadFile(string dressid,string dresscaption)
        {
                HttpPostedFileBase hpf = Request.Files[0] as HttpPostedFileBase;
...

调用操作时,Request.Files集合有0个项目,而不是所选文件.我启用了不显眼的javascript,不显眼的文件加载到母版页中,并在其他页面上工作.

我在论坛上看到了一些关于小心文件大小的消息.我正在测试的文件是< 2K 任何想法为什么Request.Files中没有项目？谢谢

您无法使用AJAX上传文件.所以用普通的Html.BeginForm替换Ajax.BeginForm.您也可以查看 following blog post.

如果要使用异步上载,可以尝试一些可用的上载组件,例如Ajax Upload和Uploadify.

使用ajax表单上传mvc3文件 – Request.Files为空

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