ASP.NET MVC中，怎么使用jquery/ajaxForm上传文件

@using (Ajax.BeginForm("YourAction", "YourController", new AjaxOptions() { HttpMethod = "POST" }, new { enctype = "multipart/form-data"}))
{
@Html.AntiForgeryToken()
<input type="file" id="file" name="files"><br>
<input type="submit" value="Upload File to Server">
}

@using (Html.BeginForm("YourAction", "YourController", new{ area = "YourArea" }, FormMethod.Post,new { enctype = "multipart/form-data"}))
{
@Html.AntiForgeryToken()
<input type="file" id="file" name="files"><br>
<input type="submit" value="Upload File to Server">
}

[HttpPost]
[ValidateAntiForgeryToken]
public void YourAction(IEnumerable<HttpPostedFileBase> files)
{
if (files != null)
{
foreach (var file in files)
{
// Verify that the user selected a file
if (file != null && file.ContentLength > 0)
{
// extract only the fielname
var fileName = Path.GetFileName(file.FileName);
// TODO: need to define destination
var path = Path.Combine(Server.MapPath("~/Upload"), fileName);
file.SaveAs(path);
}
}
}
}

<div class="progress progress-striped">
<div class="progress-bar progress-bar-success">0%</div>
</div>
<div id="status"></div>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.js"></script>
<script src="http://malsup.github.com/jquery.form.js"></script>

<script>
(function() {

var bar = $('.progress-bar');
var percent = $('.progress-bar');
var status = $('#status');

$('form').ajaxForm({
beforeSend: function() {
status.empty();
var percentVal = '0%';
bar.width(percentVal)
percent.html(percentVal);
},
uploadProgress: function(event, position, total, percentComplete) {
var percentVal = percentComplete + '%';
bar.width(percentVal)
percent.html(percentVal);
},
success: function() {
var percentVal = '100%';
bar.width(percentVal)
percent.html(percentVal);
},
complete: function(xhr) {
status.html(xhr.responseText);
}
});

})();
</script>