Angularjs webAPI控制器中的ng流访问参数

我正在使用ng flow将图像上载到我的webAPI，如下所示：

                <div class="form-horizontal" role="form" flow-init="config"
                     flow-file-added="!!{png:1,gif:1,jpg:1,jpeg:1}[$file.getExtension()]"
                     flow-files-submitted="$flow.upload()">
                    <img flow-img="$flow.files[0]" style="max-width:150px; max-height:150px;" />
                    <span class="btn btn-success" flow-btn flow-attrs="{accept:'image/*'}">Upload Image</span>
                </div>

问题是如何访问api控制器中的“id”参数，我尝试访问Content-D。但没有成功：

        string root = HttpContext.Current.Server.MapPath("~/Content/Images/User");
        var provider = new MultipartFormDataStreamProvider(root);

        try
        {
            // Read the form data.
            await Request.Content.ReadAsMultipartAsync(provider);

            // This illustrates how to get the file names.
            foreach (MultipartFileData file in provider.FileData)
            {
                //Console.WriteLine(file.Headers.ContentDisposition.FileName);
                //Trace.WriteLine("Server file path: " + file.LocalFileName);
                var PId = file.Headers.ContentDisposition.Parameters.First(x => x.Name.Contains("id"));

---

这花了太长时间：

var provider = new MultipartFormDataStreamProvider(root);
var x = provider.FormData["id"];

---

我的问题是，当我在查询中包含参数值时，它没有到达我的控制器方法。您是否对控制器方法声明进行了任何更改？你期望那里有什么参数吗？

var provider = new MultipartFormDataStreamProvider(root);
var x = provider.FormData["id"];